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Old   August 12, 2003, 18:58
Default Flow induced vibrations
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I would like to use a commercial software package for modeling turbulence. The flow under consideration is unsteady, incompressible, with Re ~ 1.0e05. The geometry involved is complicated for which I have an ANSYS model (which I believe can be imported in any solver easily). Most importantly, I need to model (and simluate) the interaction of the flow with a structure which forms an obstruction to the flow.

Given loadings (in terms of pressure) from a CFD solver, ANSYS can easily compute the dynamic response of the structure (in bending, torsion, etc) however I would like these displacements to be feeded back to the solver for the next iteration. In this way, I would like to construct an unsteady evolution series of the flow field and the response of the structure to the flow. (Sometimes called flow-structure interaction, or flow induced vibrations).

Does anyone have any experience doing this before? Is there any reason to choose CFX or Fluent or CFDRC over any other? Do you have any tips for me? I already have ANSYS but the CFD solver for it (FLOTRAN) is buggy, not easy to work with and at times fails to post-process. A finite volume grid size of 200*200*50 would suffice; I have a single P4, 1GB RAM machine to work with and would need results in reasonable amounts of time.

Please let me know what you think, many thanks!
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Old   August 13, 2003, 13:29
Default Re: Flow induced vibrations
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As far as we know, fluidyn-FSI is the only currently available software able to couple finite elements and finite volumes inside the same solver.

We have performed many VIV - FIV type of validation cases and studies for the nuclear, petrochemical and aerospace industries.

Please go through the FLUIDYN website ( and see for yourself. If you are interested, you can contact me or email to the addresses given in the Website.

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Old   August 13, 2003, 14:56
Default Re: Flow induced vibrations
Michael Showalter
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CFD-ACE+ from CFD Research Corporation in Huntsville, Alabama, is a software that has been used for fluid-structure interaction for about 5 years. Please visit our web page, specifically using the following link( CFD-ACE+ and the structural dynamics module have been used for modeling flap valves, suspension bridges, aeroelasticity, heart valves, flexible membranes and a host of other highly coupled fluid-structure interaction problems.

Give me a call or e-mail if you would like to talk more about the details of the software.

Michael Showalter CFD Research Corporation Tel. 256-726-4939 E-mail -
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Old   September 1, 2003, 05:09
Default Re: Flow induced vibrations
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RADIOSS-CFD is a FE code that is used for coupled fluid structure problems with deformations of the structure and of the computational domain ranging from very small (for exemple aero-acoustics applications) to very large (for exemple crash of a car fuel tank).

You can check the ins and the outs and many exemples in the website Dont hesitate to contact me if you have any specific question.

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