Download - WB-Mech_120_WS_06.1
WS6.1-1ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
May 5, 2009Inventory #002594
Workbench - Mechanical Introduction 12.0
Workshop 6.1
Steady State Thermal Analysis
WS6.1: Steady State Thermal Analysis
WS6.1-2ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
May 5, 2009Inventory #002594
Workshop SupplementWorkshop 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 thermal results for each configuration.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop SupplementWorkshop 6.1 - AssumptionsAssumptions:• The pump housing is mounted to a pump which is held at a constant
60 °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 °C by the fluid.
• The exterior surfaces are modeled using a simplified convection correlation for stagnant air at 20 °C.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop SupplementWorkshop 6.1 – Project Schematic
• Open the Project page.• From the Units menu verify:
– Project units are set to “Metric (kg, mm, s, C, mA, mV).– “Display Values in Project Units” is checked (on).
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement… Workshop 6.1 – Project Schematic1. From the Toolbox, double
click “Steady-State Thermal”to create a new Steady State Thermal system.
2. RMB the Geometry cell and “Import Geometry” – browse to the file: “Pump_housing.x_t”
2.
1.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement… Workshop 6.1 – Project Schematic3. Double click “Engineering Data” to
access material properties.
4. With “General Materials” highlighted click the ‘+’ next to “Aluminum Alloy”and “Polyethylene” properties to add them to the project.
5. “Return to Project”.
3.
4.5.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement… Workshop 6.1 – Project Schematic6. Drag/drop a “Steady
State Thermal”system onto the “Geometry” cell in the first system.– Prior to releasing the
new system the drop box should indicate cells A2 and A3 will be shared
• When complete the schematic should graphically indicate this data sharing as shown here (we now have 2 “systems”, A and B).
6.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement… Workshop 6.1 – Project Schematic7. Double click the “Model” cell in the first
(A) system to open the Mechanical application.
8. From the Units menu choose:– “Metric (mm, kg, N, s, mV, mA)”– “Celsius (For Metric Systems)”
7.
8.
WS6.1: Steady State Thermal Analysis
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Workshop SupplementWorkshop 6.1 – Preprocessing9. Change the material and mesh on
the pump housing (“Part 1”):a. Highlight “Part 1” under geometry.b. From details import the material
“polyethylene”.c. Highlight the Mesh branch and set
the mesh relevance = 100.
c.
b.
a.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement
d. Select the mating surface of the pump housing.
e. “RMB > Insert > Temperature”.f. Set “Magnitude” field to 60 °C.
Workshop 6.1 - Environment10.Apply temperatures (highlight the
Steady State Thermal branch): a. Select the interior surfaces (13
faces) of the pump housing (hint: use “Extend To Limits” selection feature).
b. RMB > Insert > Temperature.c. Set “Magnitude” field to 90 °C.
a.
c.
d.
b.
f.
e.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement. . . Workshop 6.1 - Environment
11. Apply Convection:a. Select the exterior (32) surfaces of the pump
housing (hint: use extend to limits).b. “RMB > Insert > Convection”.c. In the “Details of Convection” click in the “Film
Coefficient” field and choose “Import . . . ”.
Be sure to choose import for convections.
d. “Import” the correlation “Stagnant Air –Simplified Case”.
e. Set the “Ambient Temperature” field to 20 °C.
a.
d.c.
b.
e.
WS6.1: Steady State Thermal Analysis
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Workshop SupplementWorkshop 6.1 – Solution – Model A12.Solve the model.13.When the solution is complete insert Temperature and Total Heat
Flux results (solve to evaluate results).
• Results for polyethylene model.
12.
13.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop SupplementWorkshop 6.1 – Model B Setup14. From the project schematic
double click the “Model”branch in system “B” to open a second Mechanical application window.
• Repeat steps 9 (a thru c) choosing “Aluminum Alloy”.
• Repeat steps 10 and 11 to apply the same boundary conditions on Model B.
• Repeat steps 12 and 13 to solve and view results for model B.
14.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop SupplementWorkshop 6.1 – Solution – Model B• Results for aluminum alloy model.
WS6.1: Steady State Thermal Analysis
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May 5, 2009Inventory #002594
Workshop Supplement. . . Workshop 6.1 – Postprocessing• Compare Heat Flux:
• Highlight the “Total Heat Flux” results from each model and switch to vector display mode.
Polyethylene Aluminum
Control vector density
Activate vector display