steady state thermal analysis workshop 6.1. workshop supplement steady state thermal analysis august...

Steady State Thermal Analysis

Workshop 6.1

August 26, 2005Inventory

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Workshop 6.1 - Goals

• In this workshop we will analyze the pump housing shown below for its heat transfer characteristics.

• Specifically a plastic and an aluminum version of the housing will be analyzed using the same boundary conditions.

• Our goal is to compare the exposed surface temperatures for each configuration and to investigate the distribution of heat flux in the part.


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Workshop 6.1 - Assumptions

Assumptions:

• The pump housing is mounted to a pump which is held at a constant 60 deg. C. We assume the mating face on the pump is also held at this temperature.

• The interior surfaces of the pump are held at a constant temperature of 90 deg. C by the fluid.

• The exterior surfaces are modeled using a simplified convection correlation for stagnant air at 20 deg. C.


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Workshop 6.1 - Start Page

• From the launcher start Simulation.

• Choose “Geometry > From File . . . “ and browse to the file “Pump_housing.x_t”.

• When DS starts, close the Template menu by clicking the ‘X’ in the corner of the window.


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Workshop 6.1 - Preprocessing

• Change the part material to “Polyethylene”:

1. Highlight “Part1”

2. In the Detail window “Material” field “Import . . .”

3. “Choose” material “Polyethylene”.

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4. Set the working units to (m, kg, N, C, s, V, A) “Units” menu choose

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5. Highlight the Environment branch. Select the interior (13) surfaces of the pump housing (hint: use Extend Selection feature).

6. “RMB > Insert > Temperature”.

7. Set “Magnitude” field to 90 C.

Workshop 6.1 - Environment

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8. Select the mating surface (1) of the pump housing.

9. “RMB > Insert > Temperature”.

10. Set “Magnitude” field to 60 C.

. . . Workshop 6.1 - Environment

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11. Select the exterior (32) surfaces of the pump housing (hint: use extend to limits).

12. “RMB > Insert > Convection”.

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13. In the Details change the “Type” field from “Constant” to “Temperature-Dependent”.

14. “Import” the correlation “Stagnant Air – Simplified Case”, if necessary.

15. Set the “Ambient Temperature” field to 20 deg. C.

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Workshop 6.1 - Solution

• Add temperature and total heat flux results.

16. Highlight the Solution branch.

17. “RMB > Insert > Thermal > Temperature”

• Repeat the above steps to add “Total Heat Flux”.

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Workshop 6.1 – Duplicate Model

• Before solving we will duplicate the model and specify a different material for the pump housing. This will allow us to compare the responses for each.

18. Highlight the “Model” branch.

19. “RMB > Duplicate”.

20. From the new branch “Model2” highlight “Part1”

21. In the detail window “Import” the material “Aluminum Alloy”.

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Workshop 6.1 - Solution

22. Highlight the “Project” branch in the tree and solve.

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• Note: by issuing a solve from the Project branch both Model branches will be solved. If single solutions are desired highlight only the branch to be solved before beginning the solve.


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Workshop 6.1 - Postprocessing

• When the solutions are complete, inspect the temperature plots and compare. It can be seen quickly that the choice of material in this case has a significant effect.

AluminumPolyethylene


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. . . Workshop 6.1 - Postprocessing

• A similar comparison of the heat flux in each model points up differences. Here a vector heat flux plot is shown in wireframe mode. Note how much of the energy in the aluminum model is returned via the mating face.



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• To better view the exterior surface temperatures we will employ scoping as in previous workshops.

23. Select the outside (32) surfaces of the pump housing (use extend to limits).

24. “RMB > Insert > Thermal > Temperature” (note the scope of the new result now indicates “32 Faces” rather than “All Bodies”

• Using RMB, copy/paste the new result into Model 2 Solution branch. Notice the scope of the result remains in tact.

• Solve from the Project branch.

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• The 2 new plots now display outside temperatures for both models. Notice the contours are not affected by interior temperatures as were the previous plots.



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Workshop 6.1 - Reporting

• If time permits, create figures to include in a report and generate the report.

steady state thermal analysis workshop 6.1. workshop supplement steady state thermal analysis august...

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