Transcript No Slide Title

ANSYS Mechanical Introduction 12.0
Workshop 6.1
Steady State Thermal Analysis
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WS6.1: Steady State Thermal Analysis
Workshop 6.1 - Goals
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• 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.
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Workshop 6.1 - Assumptions
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Assumptions:
• 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.
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WS6.1: Steady State Thermal Analysis
Workshop 6.1 – Project Schematic
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• 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).
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WS6.1: Steady State Thermal Analysis
… Workshop 6.1 – Project Schematic
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1. From the Toolbox, double
click “Steady-State Thermal”
to create a new Steady State
Thermal system.
1.
2. RMB the Geometry cell and
“Import Geometry” – browse
to the file:
“Pump_housing.x_t”
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2.
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… Workshop 6.1 – Project Schematic
3. Double click “Engineering Data” to
access material properties.
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3.
4. With “General Materials” highlighted
click the ‘+’ next to “Aluminum Alloy”
and “Polyethylene” properties to add
them to the project.
5. “Return to Project”.
4.
5.
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… Workshop 6.1 – Project Schematic
6. Drag/drop a “Steady
State Thermal”
system onto the
“Geometry” cell in
the first system.
–
•
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6.
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).
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… Workshop 6.1 – Project Schematic
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7. Double click the “Model” cell in the first
(A) system to open the Mechanical
application.
7.
8. From the Units menu choose:
– “Metric (mm, kg, N, s, mV, mA)”
– “Celsius (For Metric Systems)”
8.
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Workshop 6.1 – Preprocessing
9. 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.
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a.
b.
c.
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Workshop 6.1 - Environment
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10. Apply temperatures (highlight the
Steady State Thermal branch):
a.
b.
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.
d. Select the mating surface of the
pump housing.
e. “RMB > Insert > Temperature”.
f. Set “Magnitude” field to 60 °C.
f.
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c.
e.
d.
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. . . 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 . . . ”.
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b.
a.
Be sure to choose import for convections.
d. “Import” the correlation “Stagnant Air –
Simplified Case”.
e. Set the “Ambient Temperature” field to 20 °C.
c.
d.
e.
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Workshop 6.1 – Solution – Model A
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12.
12. Solve the model.
13. When the solution is complete insert Temperature and Total Heat
Flux results (solve to evaluate results).
13.
•
Results for polyethylene model.
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Workshop 6.1 – Model B Setup
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14. From the project schematic
double click the “Model”
branch in system “B” to
open a second Mechanical
application window.
14.
•
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.
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WS6.1: Steady State Thermal Analysis
Workshop 6.1 – Solution – Model B
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• Results for aluminum alloy model.
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. . . Workshop 6.1 – Postprocessing
•
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Compare Heat Flux:
•
Highlight the “Total Heat Flux” results from each model and switch to
vector display mode.
Activate vector display
Control vector density
Polyethylene
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Aluminum
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