Chapter 1 Introduction

Workshop 1 Structural 1-way FSI

Solving FSI Applications using Workbench, ANSYS Mechanical and CFX ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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July 2009 Inventory #002678

Structural 1-way FSI

Problem Description

Training Manual

• Consider a Probe which protrudes into a flow field and subjected to a high flow velocity

• We would like to know how a 100 m/s velocity through the flow passage will affect the probe structurally: – Find equivalent stresses, calculate deformations

• This type of analysis is available under Custom Systems in the Workbench Toolbox • In this case the fluid flow solution has already been completed ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Open the Project

Training Manual

1. Open Probe.wbpj in Workbench

2. From the Project page, ensure that Named Selections will be transferred between applications: – –

Tools > Options > Geometry Import Check box for Named Selections and remove NS for Filtering Prefix

ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Project Schematic

Training Manual

3. Drag Static Structural (ANSYS) from the Analysis Systems toolbox and drop it onto the Solution cell of the Fluid Flow system (cell A5)

Links are created to share the geometry and to transfer the Fluid Flow Solution to the Static Structural Setup. The solution data will be used as a pressure load in the Static Structural system.


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Static Structural Model

Training Manual

4. Double-click on Model under Static Structural (ANSYS) •

Mechanical will open

5. Expand the Geometry item in the Outline tree and suppress the fluid geometry by rightclicking on Flow and selecting Suppress Body •

Note presence of Imported Load (Solution) in the model tree-view


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Structural Mesh

Training Manual

6. Select Mesh in the Outline tree 7. In the details view expand Sizing and set Relevance Center to Fine 8. Right-click on Mesh and select Generate Mesh


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Frictionless Support

Training Manual

9. Insert a Frictionless Support on the symmetry plane faces


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Fixed Support

Training Manual

10. Apply a Fixed Support on the top face of the probe


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Load from CFX

Training Manual

10. Expand the Imported Load (Solution) item and select Imported Pressure –

Note that both the static pressure of the flow field and the shear stress at the walls will be included

11. Click once in the Geometry field, select all 7 external surfaces then click Apply in the Geometry field 12. Select Probe from the CFD Surface list –

–

This is the wall boundary condition applied to the probe surfaces in CFX Group boundaries in CFX with FSI in mind


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Solve

Training Manual

13. Right-click on Imported Pressure and select Import Load

14. Right-click on Static Structural in the Outline tree and select Solve


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Results 15. 16. 17. 18.

Training Manual

Right-click on Solution and select Insert > Stress > Equivalent Right-click on Solution and select Insert > Deformation > Total Right-click on Solution and select Evaluate All Results Examine the stress and deformation results –

The small deformations confirm that 1-way FSI is suitable

19. Close Mechanical, save the Project then close Workbench


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