Thermal/Structural Analysis of a Roots type Supercharger.

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Thermal/Structural Analysis of a Roots type Supercharger.

In this exercise, we will perform a thermal/structural analysis of a Roots type automobile supercharger.

The Roots type supercharger shown below is used to boost the intake pressure of an internal combustion engine by approximately 12-15 PSI, drastically improving the performance of the engine. The device consists of two rotor assemblies turning in opposite directions. The air is pushed around the outside of the rotors and out the bottom. Air can't leak back up through the rotors due to the close clearances between the rotors and the case. The outer surface of each rotor lobe contains a Teflon seal strip to prevent leakage. In order to reduce pulsing of the pressure, the lobes are often twisted along the rotational axis, or helically, as shown below.

Supercharger

Case

Teflon Seal

Lobe

Rotor

Air Flow

The purpose of this analysis is to determine the clearance or interference of the rotor lobe seals and the case. Minimizing this clearance under start-up and operating temperatures is crucial to supercharger performance. We will do this by performing a steady state thermal analysis of the supercharger followed by a structural contact analysis.

Symmetry will be used to model only half of one rotor and 1/4 of the case. The geometry will be imported into ANSYS Professional as an existing ANSYS database to save you time.

A steady state thermal analysis will be performed. Thermal boundary conditions will consist of an elevated internal temperature convection load and an ambient temperature convection load on the exterior.

A structural analysis will follow the thermal. Loading will be thermal loads from the previous heat transfer analysis, internal pressures, and a rotational velocity on the rotor. Contact elements will be used to seat the Teflon seals in the rotor lobe slots, and to determine the clearance or rub between the rotor seals and the case.

Summary of Steps:

Launch ANSYS/Professional:

Launch ANSYS using your start menu.

Mechanical Toolbar Setup:

Toolbar settings.

Model:

Import Model.

Plotting Controls.

Material Properties:

Rotor Material Properties.

Housing Material Properties.

Seal Material Properties.

Contact Definition:

Define Contact Pairs.

Meshing:

Mesh Model.

Thermal Loads Application:

Rotor Convection Surface Selection.

Rotor Convection Load Application.

Internal Housing Surface Selection.

Internal Housing Convection Load Application.

External Housing Surface Selection.

External Housing Convection Load Application.

Thermal Solution:

Save Database.

Solve

Thermal Results Post Processing:

Temperature Plots:

Structural Analysis.

Structural Model Setup.

Structural Contact Element Definition.

Add Contact.

Structural Loads and BC's:

Pressure Loads.

Body Loads.

Symmetry BC's.

Structural Model Solution:

Solve

Post Processing:

Stress Plots.

Structural Analysis Report Generation.

Conclusions:

Step-by-step Instructions:

Before beginning this problem, create a separate folder on your computer for this job and copy the ANSYS database blower.db to this folder from the CD.

Launch ANSYS/Professional

Launch ANSYS using your start menu

A. Browse to select the working directory you just created for this job.

B. Enter a job name (blower1). All ANSYS files created for this problem will have a filename of blower1 followed by a unique extension.

C. Change the workspace and database sizes for this job to be 512 and 128 respectively.

D. Click RUN to start the ANSYS GUI.

1.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003300310037000000

1.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003100320036000000

1.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003300320039000000

1.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003300320033000000

Mechanical Toolbar Setup

Toolbar settings.

A. Change Structural to Thermal

B. Change the units to inch-lbm-s-F

C. Change the title to Roots Blower Thermal Analysis

2.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380039000000

2.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350036003100350035000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

2.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350036003100350035000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350034003400350034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350034003400350034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

Model

Import Model.

A. Pick the Model tab in the Mechanical Toolbar (MTB).

3.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003100340031000000 23323j921x

B. Next, we will import the blower geometry from an ANSYS database. (ANSYS can import a variety of geometry formats as well). Pick the Import Geometry button.

3.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003100340037000000

C. A dialog box will appear for you to select the file to import. Change the Files of type setting to ANSYS (*db)

D. Select blower.db

E. Open

3.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400330034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400330034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400340034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400340034000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400340038000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390034003400340038000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

F. Ansys will ask if you want to import this model as an assembly. Pick Yes.

3.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300036003400380031003800390036000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

3.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300036003400380031003800390036000000

2.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003300390032003700380034000000

Plotting Controls

A. Use the Pan/Zoom/Rotate function to scrutinize all parts of the model. In the utility menu, pick PlotCtrls

B. Pan, Zoom, Rotate. A view control window will appear on your screen.

3.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390038003000380030003200330035000000

3.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390038003000380030003200340032000000

These buttons will orient your display to predefined view perspectives.

These buttons will orient your display to predefined view perspectives.

Zoom by picking a center point and the edge of your window.

Zoom by picking a center point and the edge of your window.

Zoom by picking two diagonal corners of your window.

Zoom by picking two diagonal corners of your window.

Arrows will pan your model in the direction of the arrow. The distance your model is moved can be controlled using the Rate slider below.

Rotate buttons will incrementally rotate your model about the screen axis and direction shown on the button. The amount of rotation is also controlled by the rate slider.

Rotate buttons will incrementally rotate your model about the screen axis and direction shown on the button. The amount of rotation is also controlled by the rate slider.

With dynamic Mode checked, you can use the mouse buttons described at left to move the model or the lights used in light source shading.

With dynamic Mode checked, you can use the mouse buttons described at left to move the model or the lights used in light source shading.

The Fit button will scale your model to fit in the window.

The Fit button will scale your model to fit in the window.

Pan Zoom Rotate Functions:

Activate dynamic mode. With this button checked, you can use dynamic viewing controls.

Use the left mouse button to pan the model.

With the middle button depressed, move up/down to zoom in/out, and left/right to rotate about the screen Z-axis.

With the right button depressed, move up/down to rotate about the screen X-axis, and left/right to rotate about the screen Y-axis.

button to pan the model.

C. Use the Pan/Zoom/Rotate controls to orient the model to a view similar to the one below:

3.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350035003800340036000000

Material Properties:

We will use three different materials for this model. The rotor is made of aluminum. The case and bearing plate are made of cast iron. The seal strips at the OD of the rotor are made of Teflon.

During the structural analysis, we will assign a rotational velocity to the model. Since centrifugal loading in ANSYS cannot be applied selectively, we will assign a zero density to the case material to prevent it from "spinning".

Rotor Material Properties.

A. In the material list, pick New Material .

4.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200340035000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

4.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200340035000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

B. A dialog box will appear for you to define this material. Enter a name of Rotor.

4.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350037003900350034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350037003900350034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Pick the Structural tab.

D. For Elastic modulus, enter: 10.6e6

E. For Specific Weight, enter: 0.100.

F. For Thermal expansion coeff, enter: 12.6e-6

G. For Poissons ratio, enter: 0.33

Pick the Thermal tab to define the thermal properties.

I. For

4.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400390039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400390039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400360032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400360032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100300031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100300031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400380037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400380037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400370036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003400370036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Conductivity, enter: 0.0069

J. Specific heat is not needed in a steady state analysis, so we will leave that field blank. Pick OK.

4.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003600370031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003600370031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003600370039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350038003600370039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

K. Next, we will assign this material to the rotor geometry. In the MTB, pick the Assign Material button.

4.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350039003300380034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350039003300380034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

L. Highlight Rotor in the material list.

M. Continue

4.1.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350039003300370035000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350039003300390032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100350039003300390032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

A dialog box will appear for you to select the volumes for the rotor. In the graphics window, click and hold the left mouse button over the rotor. If the wrong volume is highlighted, drag the cursor around until the rotor highlights. The selection is not made until you release the mouse button.

O. OK. The plot will change and color code the rotor as shown below.

4.1.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360030003000340034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.1.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360030003000320037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Housing Material Properties:

A. In the material list, pick New Material.

4.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200390033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

4.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200390033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

B. A dialog box will appear for you to define this material. Enter a name of Housing.

C. Pick the Structural Tab.

4.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300310034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300310034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300320037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300320037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

D. For Elastic modulus, enter: 30.0e6

E. For Specific Weight, enter: 0

F. For Thermal expansion coeff, enter: 9.89e-6

G. For Poissons ratio, enter: 0.30

4.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300360037000000

Pick the Thermal tab to define the thermal properties.

I. For

4.2.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300390038000000

4.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100330032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100330032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500310036003200310038003100360036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300370038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300370038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003300370038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Conductivity, enter: 0.75

J. Specific heat is not needed in a steady state analysis, so we will leave that field blank. Pick OK.

4.2.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400310031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400310031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400320031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400320031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

K. Next, we will assign this material to the rotor geometry. In the MTB, pick the Assign Material button.

4.2.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400340039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400340039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

L. Highlight Housing in the material list.

M. Continue.

4.2.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400360034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400360034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400370032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400370032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

N. A dialog box will appear for you to select the volumes for the case material. Pick the case and the bearing plate at the back of the rotor.

O. OK. The plot will change and color code the rotor as shown below.

4.2.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003400390038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.2.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003500310030000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Seal Material Properties:

A. In the material list, pick New Material.

4.3.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200300033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

4.3.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200300033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003300310034000000

B. A dialog box will appear for you to define this material. Enter a name of Teflon Seal.

C. Pick the Structural Tab.

4.3.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200310034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200310034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200320032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003200320032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

D. For Elastic modulus, enter: 67000

E. For Specific Weight, enter: 0.078

F. For Thermal expansion coeff, enter: 48.0e-6

G. For Poissons ratio, enter: 0.46

Pick the Thermal tab to define the thermal properties.

I. For

4.3.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350037003800380032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100380031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003100380031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003600380037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003600380037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700320037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700320037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700310035000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700310035000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Conductivity, enter: 0.15

J. Specific heat is not needed in a steady state analysis, so we will leave that field blank. Pick OK

4.3.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700340032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700340032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360032003700360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

K. Next, we will assign this material to the rotor geometry. In the MTB, pick the Assign Material button.

4.3.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000310032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000310032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

L. Highlight Teflon Seal in the material list.

M. Continue

4.3.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000320036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000320036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000330036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003000330036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

N. A dialog box will appear for you to select the volumes for the seals. Pick the three seals on the OD of the rotor. The hot spot for each volume as at it's geometric center. Even though some of them may be hidden from view, you can still select them by picking at their center location.

O. OK. The plot will change and color code the rotor as shown below.

4.3.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003400310033000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

4.3.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003100360033003400320039000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Contact Definition:

We are ready to define the contact surfaces. ANSYS can automatically detect areas that are in or near contact and define contact pairs.

Define Contact Pairs:

A. Click and hold the View/Modify Contact button until the fly-out appears. Pick the Auto Create Contact button.

5.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003000390035000000

Error! Reference source not found.

5.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003000390035000000

Error! Reference source not found.

B. ANSYS will search for surfaces that are within a certain proximity to each other when defining contact pairs. A proximity tolerance of 100 (Tight) means that surfaces must be exactly touching in order for contact to be defined. For our model, set the tolerance to 100.

C. Pick OK. ANSYS will create the contact pairs. This may take a few minutes.

5.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003100300037000000

Error! Reference source not found.

5.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003100300037000000

Error! Reference source not found.

5.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003300350031000000 23323j921x

D. When ANSYS finishes, a dialog will appear indicating that 14 contact pairs have been created. This dialog contains several options as shown below.

View/Modify Contact: View existing contact pairs and modify their properties.

View/Modify Contact: View existing contact pairs and modify their properties.

View/Modify Contact: View existing contact pairs and modify their properties.

View/Modify Contact: View existing contact pairs and modify their properties.

Auto Create Contact: Automatically detect and create contact pairs.

Auto Create Contact: Automatically detect and create contact pairs.

Auto Create Contact: Automatically detect and create contact pairs.

Auto Create Contact: Automatically detect and create contact pairs.

Manually Create Contact: Define contact pairs by picking.

Manually Create Contact: Define contact pairs by picking.

Manually Create Contact: Define contact pairs by picking.

Manually Create Contact: Define contact pairs by picking.

Delete Contact: Delete Contact Pairs

Delete Contact: Delete Contact Pairs

Delete Contact: Delete Contact Pairs

Delete Contact: Delete Contact Pairs

Modify Contact Pair Normals: I.e. the normal directions of each contact pair must point towards each other to be correct.

Modify Contact Pair Normals: I.e. the normal directions of each contact pair must point towards each other to be correct.

Modify Contact Pair Normals: I.e. the normal directions of each contact pair must point towards each other to be correct.

Modify Contact Pair Normals: I.e. the normal directions of each contact pair must point towards each other to be correct.

5.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350031003700370031000000 23323j921x

In the Contact Toolbar, pick the View/Modify Contact button.

F. A dialog will appear showing a list of the contact pairs.

G. The first contact pair will be highlighted in the graphics window.

5.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350032003500330030000000

5.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350032003500340032000000

5.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350033003000300034000000

In the View/Modify Contact Pairs dialog, pick: Contact Pair 2: to view the next pair.

I. The next pair will be highlighted in the graphics window.

5.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350033003100350032000000

5.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350033003700330032000000

Repeat this process and view all the contact pairs that were defined for you. In our model, the auto-contact feature created two extra pairs that aren't necessary. When you get to pair 9, we will delete this one. (We could have retained this pair, but it is a small feature and we want to demonstrate the delete capability).

K. With Contact Pair 9 highlighted, click the right mouse button until the delete option appears. Then pick the Delete button.

5.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350033003500330035000000

L. Continue cycling through the contact pairs until you reach Contact Pair 14: Like the previous pair, we could retain this one, but we will delete it for demonstration purposes.

5.1.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350034003300360030000000

M. Delete this one also. With Contact Pair 14: highlighted, pick the right mouse button until the delete button appears. Then pick the delete button.

5.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350034003300370031000000 23323j921x

N. We have completed the thermal contact element definition. Pick OK in the View/Modify Contact Pair dialog.

5.1.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350034003600340037000000

O. Pick OK in the Contact Toolbar.

5.1.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350034003600350037000000

Meshing:

Mesh Model:

A. In the MTB, pick the Meshtool button.

6.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200330039003800350037000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

B. We mesh this model with a default element size instead of the smartsize option. Make sure the Smart size button is not checked.

6.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200330039003800360036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Under Size Controls, pick Global.

6.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200330039003800370034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200330039003800370034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

D. For Element edge length, enter: 0.25

6.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003000350033000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003000360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003000360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

OK.

F. In the Meshtool, pick the Mesh button.

6.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003400340038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003400340038000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003400320030000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003400320030000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

A dialog will appear for you to select volumes for meshing. Pick the Pick All button.

H. It may take a few minutes to mesh your model. When complete, pick the Element Plot fly-out button in the MTB.

6.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003700360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

6.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003700360031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

I. The mesh should look like the one below:

6.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200340030003800350035000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Thermal Loads Application:

We will apply two convection loads to our model. The exterior surfaces of the housing will have an ambient condition of h=10, T=70. The internal surfaces of the housing and rotor will have h=100, T=200. Since this is a complex model, it will be difficult select surfaces for the load application. We will utilize the powerful select logic in ANSYS to help us.

The procedure will be to select groups of surfaces for load application and store these as components prior to applying loads. This will save us from having to select surface groups again when we apply pressure loads during the structural analysis.

Rotor Convection Surface Selection.

A. In the Utilities menu, pick the Select button.

B. Entities.

C. Volumes.

7.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900330033000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

Apply.

7.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900360035000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900350034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900350034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900340032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900340032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

E. A dialog box will appear for you to select volumes. Click and hold the left button over the rotor. Release the button when the rotor volume is highlighted. Pick the three Teflon strips as well. Even though one or more of them may be hidden from view, you can still select them by picking near each of their center locations.

Pick near each Teflon seal center. Pick the rotor also.

F. OK

G. In the Select Entities dialog, pick Sele Belo. This will select all the lower order entities associated with the volume including the areas, lines, keypoints, nodes, and elements.

H. Pick the Replot button in the Select Entities dialog.

7.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003400370031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003400370031000000 23323j921x

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350038003100310033000000

7.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003400380034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003400380034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

I. You should see only the rotor areas as shown in the plot below:

7.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003800390033000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350031003800390033000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350032003600300036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350032003600300036000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

The symmetry cut plane of the rotor should not have any loads applied to it, so we will unselect this area. In the Select Entities dialog, pick Areas.

K. Unselect.

L. Apply.

M. Pick the areas defining the symmetry cut planes of the rotor and the three Teflon seals.

7.1.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350032003600320038000000

7.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350032003700330034000000

7.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350032003600310038000000

You should have four areas selected.

7.1.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350033003000340035000000

OK.

O. Pick the Plot button until the fly-out appears. Pick the Plot Areas button.

7.1.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700350038003200300030000000

Error! Reference source not found.

Your plot should look like the one below:

7.1.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350033003100320037000000

Q. Before we apply the convection loads, let's store this group of areas in a component for easy recall later on. In the Utilities menu, pick Select >Comp/Assembly >Create Component.

7.1.Q08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350033003600390038000000

R. For Component name, enter: rotorld.

S. Change Component is made of to: Areas.

T. OK.

7.1.R08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003000310034000000

7.1.S08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003000320032000000

7.1.T08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003000330032000000

Rotor Convection Load Application:

A. We are ready to apply the convection load to the rotor. In the MTB, pick the Load tab.

B. Pick the Area Convection button.

7.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350035003200370030000000

7.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003500320037000000

C. A dialog will appear for you to select areas. Choose the Pick All button.

D. For Convection coefficient, enter: 0.1.

E. For Bulk Temperature, enter: 200.

F. OK.

7.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003900320031000000 23323j921x

ANSYS will plot convection load symbols on the areas as shown below.

7.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003900310030000000

7.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003800390036000000

7.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350034003900320039000000

7.2.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350035003000310038000000

Internal Housing Surface Selection:

Next, we will select the internal surfaces of the housing and bearing plate.

A. To speed plotting, turn off the boundary condition symbol display. Pick the Boundary Condition button in the MTB.

7.3.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340035003000310030000000

7.3.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340035003400360038000000

Restore the entire model to the selected set. In the Utility menu, pick Select >Everything.

C. Plot the Volumes to see the entire model again. Pick the Plot Volumes button.

7.3.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340035003600300038000000

In the Utility menu, pick Select >Entities.

7.3.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003200360033000000

E. Volumes.

F. Apply.

7.3.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003200380032000000

7.3.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003200370031000000 23323j921x

G. A dialog box will appear for you to select volumes. Pick the housing and bearing plate volumes as shown in the picture below.

7.3.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003500320036000000

Bearing Plate

Housing

H. Pick OK in the Select Volumes dialog.

7.3.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003800340033000000

7.3.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340037003800350031000000 23323j921x

Pick Sele Below.

7.3.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340038003800360035000000

7.3.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340038003800370036000000

Next, we will select the areas describing the internal surfaces of the blower. In the Select Entities dialog, change Volumes to Areas.

K. Reselect.

L. Apply.

7.3.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500310033003400370034003600300030000000

7.3.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600340038003800370036000000

M. A dialog will appear for you to select areas. There are three areas making up the internal surfaces. Pick near the hot spots shown below. Use the dynamic viewing controls to obtain better views. When selecting the bearing plate area, be sure to select the inner most surface as shown below.

Bearing plate. Select the front of the bearing plate. Be careful not to select the outer surfaces.

Bearing housing upper surface

Bearing housing lower surface

3 areas total

5 total areas

7.3.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003000390032000000

You should have 3 areas total selected. Pick OK.

O. In the MTB, pick the Plot Areas fly-out.

7.3.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003100300032000000

7.3.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003200300030000000

Your plot should look like the one below.

Q. As before, we will create a component of these areas to make selecting them easier later on. In the Utility menu, pick: Select >Comp/Assembly >Create Component.

7.3.Q08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003400370039000000

R. Enter the name internal for this component.

S. Areas.

T. OK.

Internal Housing Convection Load Application:

7.3.S08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003800380032000000

7.3.R08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003800360039000000

7.3.T08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350030003800390037000000

We are ready to apply the convection load to these surfaces. In the MTB, pick the Area Convection button.

7.4.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350031003300300030000000

B. Pick All.

7.4.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350031003700300033000000

C. Enter 0.1 for the Convection Coefficient and 200 for the Bulk Temperature.

D. OK.

7.4.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350031003700310036000000

7.4.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350031003700320037000000

Your graphics window should look like the one below.

7.4.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350031003800380039000000

External Housing Surface Selection.

There are many surfaces comprising the external housing, which would make it very difficult to select them. It will be easier to select all surfaces on the housing, then to unselect the ones we don't want.

7.5.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350033003000330031000000 23323j921x

In the Utility menu, pick Select >Entities.

7.5.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003300340038000000

Change Areas to Volumes.

C. Apply.

D. Pick the housing volume as shown below.

E. OK.

7.5.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003300360033000000

7.5.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003300380036000000

7.5.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003400300034000000

F. Aain select all entities below the selected volume. Change Entity type to Volumes.

G. Sele Belo.

H. Replot.

7.5.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350033003400330039000000

7.5.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350033003400350031000000 23323j921x

7.5.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350033003400360033000000

Turn off the Boundary condition symbols again to speed plotting. Note: You may have to press this button twice.

7.5.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350033003600330039000000

J. We will begin by unselecting the internal surfaces. In the Select Entities dialog, change Volumes back to Areas.

7.5.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003800350033000000

7.5.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003800340031000000 23323j921x

7.5.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350034003800320036000000

Unselect.

L. Apply.

M. A dialog will appear for you to select areas. Pick the three internal surfaces to start with as shown below. Use the dynamic viewing controls to obtain the best view during this process. Pick OK.

7.5.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350035003500350030000000

Back Face

Bearing housing upper surface

Bearing housing lower surface

N. In the Select Entities dialog, pick the Replot button. Your plot should look like the one below.

O. Pick the Apply button again to unselect more areas.

7.5.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350039003200360034000000

7.5.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600350039003500320037000000

P. Pick the surfaces on the symmetry cut planes of the housing and the holes as shown in the two views below. There will be two areas for each hole. You should pick 18 areas total.

7.5.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360031003500340038000000

7.5.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360031003500340038000000

Q. Make sure there are 18 areas selected. OK.

7.5.Q08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360031003600320030000000

7.5.R08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360031003800350030000000

Pick the Replot button. Your plot should look like the one below:

S. Store this selection of areas as another component. In the Utility menu, pick Select >Comp/Assembly >Create Component.

7.5.S08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003300310036000000

Enter a name of external for the component name.

U. OK.

7.5.T08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003300320037000000

7.5.U08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003300340030000000

External Housing Convection Load Application:

A. We are ready to apply the convection load to these surfaces. In the MTB, pick the Area Convection button.

7.6.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003900300038000000

B. Pick All.

Enter 0.02 for the Convection coefficient and 70 for the Bulk temperature.

D. OK.

7.6.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003900330034000000

7.6.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003900340033000000

7.6.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360032003900310038000000

7.6.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360033003100320031000000 23323j921x

Your graphics window should look like the one below.

F. We have completed the boundary condition application for the thermal analysis. Before we proceed, let's restore all entities to the selected set. In the Utility menu, pick Select >Everything.

7.6.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360033003500310033000000

Thermal Solution:

Save Database.

A. We are now ready to perform the thermal solution. Let's save our work before we do so. In the MTB, pick the Save button. Enter a name for the model and pick OK in the dialog that appears.

8.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360036003400370035000000

Solve.

A. Pick the Solve tab in the MTB

8.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360036003400380037000000

B. Pick the Solve Problem button.

8.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600360036003400390039000000

C. Pick OK in the confirmation dialog box. Note: You may have told ANSYS not to show this prompt again in a previous session.

8.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380031003600390038000000

D. When the solution is finished, a listing will appear showing the min and max temperature values on the model. Close this window when you are through looking at it.

8.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380034003300350030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

8.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380034003300350030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

E. A temperature plot will also be displayed in the graphics window.

8.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380034003500300034000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

8.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380034003500300034000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Note that the thermal contact elements produced a constant thermal gradient between the inner surface of the bearing plate and the outer surface of the housing.

Thermal Results Post Processing:

Temperature Plots.

A.
Use the dynamic viewing controls to view all sides of the model.

9.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380035003000300032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380035003000300032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

B. When finished scrutinizing the results, return the view to a suitable orientation for a report generation.

9.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380035003100350035000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380035003100350035000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

C. In the MTB, pick the Show Report button.

9.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003000380031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003000380031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

D. Highlight: Create a new report.

E. General Report.

F. OK.

9.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300310031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300310031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300330031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300330031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300320032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003300320032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

G. ANSYS will generate an HTML report summarizing your model and the results. When finished, the report will be launched in your default Browser. Click on the image below for a sample report. Close the report when you are finished viewing it.

9.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003500310037000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

9.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003600380037003500310037000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Structural Analysis:

We are now ready to do the structural analysis. We will return to the Setup tab, convert the model from a thermal to a structural analysis, add/modify contact elements, apply thermal loads from the previous analysis, and add structural loads and BC's.

Structural Model Setup.

A. In the MTB, pick the Setup tab.

B. Change the analysis type from Thermal to Structural.

10.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003800340032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003800340032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003800330030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003800330030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

C. ANSYS will put you into the Load menu. Pick the Setup tab again.

10.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003900340032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330035003900340032000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

D. Change the title to Roots Blower Structural Analysis.

10.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330036003500350031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330036003500350031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Structural Contact Element Definition

A. Pick the Model tab.

10.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360039003300380030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.208D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700330036003500360030000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

B. Pick the View/Modify Contact button.

10.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360037003400350034000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

We need to review all contact surfaces again to make sure they have the appropriate behavior. We want all surfaces to behave as frictionless (no separation) except the contact between the Teflon seals and the rotor slots, which will be bonded.

10.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360038003200360036000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

In the View/Modify Contact Pairs dialog, pick each pair and determine it's behavior. The first one you should change is Contact Pair 1: When it is highlighted, click the right mouse button until the option menu appears. Then pick the Properties button.

D. Contact Pair 1 is one is between the housing back face and the bearing plate.

10.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360038003200370033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

E. Pick the Bonded button.

10.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360038003400390033000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

10.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700360038003400390039000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

OK.

G. Continue checking each contact pair. When finished, review your changes with the table below:

10.2.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370030003100360031000000 23323j921x

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Contact Pair:

Contact Behavior:

Contact Pair 1

Frictionless (No Separation)

Contact Pair 2

Bonded

Contact Pair 3

Bonded

Contact Pair 4

Frictionless (No Separation)

Contact Pair 5

Bonded

Contact Pair 6

Bonded

Contact Pair 7

Bonded

Contact Pair 8

Bonded

Contact Pair 10

Bonded

Contact Pair 11

Frictionless (No Separation)

Contact Pair 12

Bonded

Contact Pair 13

Bonded

H. When finished verifying the contact behavior, pick OK to close the View/Modify Contact Pairs dialog.

10.2.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370030003300310034000000

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Error! Reference source not found.

008D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350033003000300039000000

Add contact.

Next we will manually add two contact pairs. These will be between the outer surfaces of the Teflon seals and the inner surface of the housing. These surfaces have a build clearance and thus were not originally created due to the tight clearance used during the auto-create step.

A. In the MTB, Change the default contact behavior from Bonded to Frictionless (No Separation).

10.3.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370031003000320034000000

B. It will be easier to select surfaces if we are in a line plot. Use the plot fly-out to select a Line Plot.

10.3.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370031003700300034000000

C. Pick the Fly-out option for Manually Create Contact.

10.3.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370031003700360039000000

10.3.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370032003100360037000000

Use the dynamic viewing controls to help you select the lower seal outer tip and the case inner housing as shown below.

E. Pick Apply to create the contact pair.

10.3.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370032003300310035000000

10.3.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370032003600380033000000

Pick the Housing inner surface and the other Seal slot for the last pair.

G. OK.

10.3.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370032003600390030000000

Structural Loads and BC's:

Pressure loads.

11.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003000360037000000

Next, we will apply a 15 PSI pressure load on all internal surfaces. We will first select the rotorld and internal components we defined previously. Pick: Select >Comp/Assembly >Select Comp/Assembly.

You will see several additional components you didn't create. These are working components created by the auto-contact feature. Pick the ROTORLD component.

11.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003200390037000000

11.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003300300032000000

Apply.

D. Pick: INTERNAL from the list.

E. Change Type of selection to Also select.

F. OK.

G. In the MTB, pick the Material coloring, and Redraw Model buttons to view the selected set.

11.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003000340036000000

11.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003500380035000000

11.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003500370033000000

11.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370033003500370038000000

H. Use the dynamic viewing controls to view your selected set. It should look like the plot below:

11.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003100350037000000

I. We are ready to apply the pressure load. Pick the Load tab in the MTB.

11.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003200380032000000

J. Pick the Area Pressure button.

11.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003600310038000000

K. Pick All.

11.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003600380031000000 23323j921x

L. Enter 15 for the pressure.

M. OK.

11.1.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003800310039000000

11.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003800320035000000

N. Pressure load symbols will be displayed on your model.

11.1.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370034003900310037000000

11.1.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370035003100320039000000

Restore the entire model to the selected set. In the Utility menu, pick Select >Everything.

11.1.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370035003300390033000000

Pick the Boundary Conditions button to turn off the pressure load symbols.

Q. The entire model will be redrawn.

Body Loads:

A. We are ready to apply the temperature and centrifugal loading. In the MTB, pick the Body Load button.

11.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370035003600350035000000

11.1.Q08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370035003400360034000000

11.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003000370033000000

Pick the Temperature tab in the Whole Body Loads dialog.

11.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003000370039000000

Pick the Applied from thermal analysis button.

D. OK.

E. Highlight the file Environment_1.rth.

11.2.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003000380036000000

Open.

11.2.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003300370030000000

11.2.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003300370039000000

G. Pick the Body Load button again.

11.2.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003700350036000000

H. Pick the Angular Velocity tab.

I. Enter 14000 for about the Z-axis.

J. OK.

11.2.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003900330037000000

11.2.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003900320030000000

11.2.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370036003900330030000000

Symmetry BC's.

A. Pick the Model Symmetry button in the MTB.

11.3.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370037003300340037000000

Since this is a quarter symmetry model, we will apply symmetry BC's on the two cut planes of the model, and also the bottom of the housing, which is bolted to the engine. Pick the symmetry faces shown in the plot below. (The arrows are not necessarily at the hot spots for picking).

11.3.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370037003300360033000000

C. The graphics window will redraw showing symmetry symbols.

11.3.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370037003600380030000000

D. We have completed the modeling task and are ready for solution. Pick the Save Model button to save our work before proceeding.

Structural Model Solution:

Solve.

A. Pick the Solve tab in the MTB.

12.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370037003900390037000000

B. Pick the Solve Now button.

12.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370038003100300033000000

11.3.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003700370037003800320039000000

C. Pick OK in the confirmation window. Note: This window may not appear if you told ANSYS not to show the prompt again in a previous session.

12.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310038003700340035000000

D. The solution may take several minutes. When finished, a window will appear showing the min and max displacements and stress values. When you are through looking at this window, close it.

12.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310038003700350033000000

E. ANSYS will plot the Von Mises stress in the graphics window.

12.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310038003800340036000000

Post Processing:

Stress Plots.

A. The Results Tab will now be activated in the MTB. Change the Results Item from Equivalent Stress to 1^st Principal.

13.1.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003800300036003400370038000000

B. Pick the Plot Result button.

13.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003800300036003400380034000000

The Maximum Principal stress will be displayed in the graphics window.

D. Let's view the housing by itself. In the Utility menu, pick Select >Entities.

13.1.D08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310039003300300034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

E. In the select entities dialog, pick Volumes.

F. From Full.

G. Apply.

H. Pick the housing volume.

I. Pick OK in the Select volumes dialog.

J. Pick Sele Belo in the Select Entities dialog to select the other entities associated with this volume.

13.1.J08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320030003000350036000000

13.1.G08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310039003900360030000000

13.1.E08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310039003900320034000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

7.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003200350030003900340032000000

4.1.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003500350032003700320030000000

13.1.I08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320030003000340031000000 23323j921x

13.1.F08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800310039003900330031000000 23323j921x

13.1.H08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320030003000380039000000

K. Pick the Plot Results button in the MTB.

13.1.K08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320030003700300031000000 23323j921x

13.1.L08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320030003800340030000000

The 1^st Principal Stress will be plotted in the graphics window.

Change the Result Item to Equivalent Stress and Plot Results again.

13.1.M08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003000380036000000

N. The Von Mises stress will be plotted for the Housing.

13.1.N08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003100370034000000

O. Let's repeat this procedure and look at the rotor by itself. In the Utilities menu, pick: Select >Entities.

P. Apply.

13.1.Q08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003600300036000000

Q. Even though the rotor volume is not displayed, you can still select it as long as you have From Full highlighted in the Select Entities dialog.

13.1.P08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003400370031000000 23323j921x

13.1.O08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003400360031000000 23323j921x

13.1.R08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320031003800370037000000

Pick the rotor volume.

S. Pick OK in the Select Volumes dialog.

13.1.S08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320032003000300034000000

Pick the Sele Belo button

13.1.T08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320032003300340037000000

Pick the Plot Result button. Use the dynamic viewing controls to view all sides of the rotor.

13.1.U08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320032003300350034000000

13.1.V08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320032003700300039000000

Restore the entire model to the selected set. In the Utility menu, pick Select >Everything.

W. Next, plot the Displaced shape. Change the Results Item to Displaced Shape, and pick the Plot Results button.

13.1.W08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320032003900350033000000

X. Note that the rotor has displaced more than the case, and that the displacement increases from the center outward radially. This is what you would expect since it is rotating at a high velocity.

13.1.X08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320033003100370039000000

Structural Analysis Report Generation:

A. Pick the Show Report button in the MTB.

13.2.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320033003500350038000000

B. Pick General report.

C. OK.

13.2.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320033003500360036000000

13.2.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320033003500370034000000

D. It may take several minutes for ANSYS to generate a report. When finished, it will be launched in your default browser. Pick the image below for a sample report.

Conclusions:

We have completed our analysis. What have we learned about the roots blower? The stresses are well below the yield stress of the materials. The radial deflection of the rotor is over 0.003 inches. What affect will this have on the performance of the blower? What can we do to reduce this deflection and hence minimize the clearances and leakage? What would happen if we made the rotors hollow? The mass would be reduced, and hence the centrifugal loading, but the stiffness would also be reduced.

A. We have completed our analysis. Exit ANSYS by picking: File >Exit.

B. Quit - No save!

14.A08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320038003100340036000000

13.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003800300036003900390038000000

14.B08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320038003100350032000000

13.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003800300036003900390038000000

14.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500300037003800320038003100360030000000

13.1.C08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400390039003800300036003900390038000000

OK.

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