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TryItNow!Step by Step Walkthrough: Spoiler Support

2 © 2015 ANSYS, Inc. March 28, 2016

ANSYS designed this TryItNow! experience to give you quick access to ANSYS AIM simulations on the cloud. This AIM demonstration shows the air flow over an automotive rear spoiler and the resulting stresses in the spoiler support. The simulation demonstrates the ease of setting up and solving a multiphysics simulation.

This geometry has been processed in SpaceClaim to use half the symmetric part and add a fluid flow enclosure around the structure.

TryItNow!Step by Step Walkthrough: Spoiler Support

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Select Fluid-Structure Interaction Template

Select the Fluid-Structure Interaction Template from the Study menu in AIM

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Modify Template Settings

3. Select “Create Simulation Process” and select the geometry file spoiler.scdoc to execute the template.

1. Turn off structural contact detection. This is more efficient when there is only one structural part.2. Turn on configuration to more easily work with separate solid and fluid parts.

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Task Based Workflow

The necessary simulation tasks are created, and the geometry loaded.

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Suppress the solid part in the Flow simulation

1. Select the Configuration task for the Flow simulation.

2. Selection filters enable you to switch between selecting points, lines, surfaces or bodies. Turn on the Body selection filter.

3. Left-click to select the spoiler body.

4. Right-click and add a Suppress Control to the body.

5. Right-click and update the configuration.

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Specify Mesh Inflation

3. Use ‘Automatically Defined’ to select all unlabeled surfaces

2. Right-click and use the ‘Fix’ menu to navigate to Inflation 1

1. Select the Mesh task

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Generate and Review Mesh

Right-click to Generate Mesh and review the result.

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• Select the Flow Task and review the physics panel. The initial settings are automated based on the selected template. In each section you can review the setup and modify it based on your own requirements.

• The material assignments, physics options and solver options can all be reviewed.

The Physics Panel

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Specify Inlet conditions

2. Select the Inlet face.

3. Right-click and Add an Inlet Boundary Condition. 4. Specify inlet velocity

of 80 mile/hr (36 m/s).

1. Activate the Face selection filter.

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Specify Outlet Boundary

1. Select the Outlet face.

2. Right-click and Add an Outlet Boundary Condition.

3. Specify the outlet Pressure as 0 Pa.

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Specify Far Field Boundary

1. Using Ctrl-left click, select the two far field faces.

2. Right-click and Add an Opening boundary condition.

3. Specify an entrainment pressure of 0 Pa.

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Specify Symmetry Boundary

1. Select the Symmetry face.

2. Right-click and Add a Symmetry boundary condition.

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Specify Wall Boundary

Right-click and a add Wall boundary condition. (AIM will automatically select all surfaces without a boundary condition specification for the wall.)

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Optional, Increase number of Solver processes

AIM always runs in parallel, using 2 processes by default. You can accelerate solution time by increasing the number of processes (to a maximum of 6 for Try It Now).

From the Flow physics panel, navigate to Solver Options/Solver Settings/Launch Controls, and set the number of processes. Hit Apply when done.

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Update Flow solution

Right-click on the Flow task and select Update to execute solution.

The Solution Quality tab can be used to monitor convergence. This case defaults to moderate convergence sufficient for demonstration purposes.

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Visualize Pressure Field

1. Select the Results task for the Flow simulation.

2. Right-click and add a Contour Result.

3. Select the Wall from the Location drop-down, and Pressure for the Variable.

4. Right-click and evaluate the Result.

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Suppress the flow volume in the Structural simulation

1. Select the Configuration task for the Structural simulation.

2. Turn on the Body selection filter.

3. Left-click to select the flow volume body.

4. Right-click and add a Suppress Control to the body.

5. Right-click and update the configuration.

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Specify Structural Support

3. Select the support bottom face.

4. Right-click and add a Support Boundary Condition

1. Ensure the Face selection filter is active.

2. Select the Structural Task

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Specify symmetry displacement condition

1. Select the spoiler mid face. 2. Right-click and

add a Displacement Boundary Condition

3. Change the definition to ‘Normal to boundary’, and set a 0 displacement.

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Specify surfaces for flow pressure load

1. Select the Physics Coupling object from the Fix menu.

2. Using Shift-Left Mouse, box select all the structural faces.

3. Hit the ‘+’ button to add the selection as the target of the pressure load.

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Update Results (and Structural solution)

Right-click the Structural Results task, and select Update to generate the mesh, execute the solution, and calculate results.

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Post-process Equivalent Stress Results

1. Select the Results task, and use the Search and Select bar to pick the Equivalent Stress Result.

2. Right-click to animate the results.

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TryItNow!Step by Step Walkthrough: Spoiler Support