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Old   October 10, 1999, 10:00
Default Fluid-Structure Interaction
  #1
Gabor BALINT
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Hello,

I want to simulate a cantilever plate vibrating in an incompressible fluid. I use FLUENT code for CFD similation and I-DEAS code for the structure simulation. I iterate between the two codes until the equilibrium state is achievd.

I want to know if there is someone who has similar problem.

Are there any other possibilities for the simulation?

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Old   October 11, 1999, 02:30
Default Re: Fluid-Structure Interaction
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Jonas Larsson
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Eh, I'm not sure of how you are doing this. Fluent can not handle moving grids today! Doesn't the "vibrating plate" require that you move the grid around the plate in the CFD simulation? I think that there are other commercial codes which can do this (STAR-CD perhaps, have no own experience from it).
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Old   October 11, 1999, 04:24
Default Re: Fluid-Structure Interaction
  #3
Gabor BALINT
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The procedure what I have to do now is the following:

I save my mesh and the pressure on the plate under the format universal (*.unv) and I read this in I-DEAS. After doing this, I-DEAS simulates the deformation of the plate and I take it back to FLUENT.

Of course I had some problems with the compatibility of the universal file writen by FLUENT and I-DEAS code but after all I could solve this with my own C program code.

Regarding the deformation of the mesh around the plate, I'm out to generate a coarse mesh for the first time and to refine after the deformation acheived.

Could you tell me more how can I have more information about the STAR-CD?

Anyway, I know that the last version of FIDAP (8.5) have the capability to simulate some fluid-structure interaction but the approach is still static. I mean that it doesn't work for high vibrating frequency so no possibility to study the phase shift between the fluid and the structure. (Just like in the case of coupling the two codes FLUENT and I-DEAS)

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Old   October 11, 1999, 07:04
Default Re: Fluid-Structure Interaction
  #4
Jonas Larsson
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Ah, ok, you assume that the response time of the flow is much faster than the repsonse time of the structure so that you can compute the steady flow for each structural deformation. I don't know if STAR-CD can solve the structure also, I suspect not. I think, however, that it can handle moving meshes. You can probably get more info by contacting them. Their web site is at http://www.cd.co.uk. The next version of fluent (version 6) will also have this moving mesh capability, but it wont be released until late 2000.

You metioned that you only want to have a refined mesh after the deformation - sounds strange if this is a vibrating plate which continually deforms back and forth. Perhaps I've missunderstood the whole case :-/
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Old   October 11, 1999, 10:41
Default Re: Fluid-Structure Interaction
  #5
Raza Mirza
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CFD-ACE+ from CFD Research Coporation offers a module to carry out coupled Fluid-Structure Interaction simulations. It has been used for more than year now by our customers, and by engineers at CFDRC, to simulate problems involving fluid-structure interaction.

Visit our website, http://www.cfdrc.com. Look under Software Products-->Addons-->CFD-FEMSTRESS. You will see many neat examples of simulations with couple Fluid-Structure Interaction. For more information, please write to rmm@cfdrc.com.
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Old   October 12, 1999, 04:54
Default Re: Fluid-Structure Interaction
  #6
Gabor BALINT
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Yes, so I mean that I dont wan't to deform all mesh around my plate, rather I use the refining mesh capability of the FLUENT. So first I create a coarse mesh with P-CUBE around the plate and only in FLUENT I'm going to refine automatically and doing so I have possibility to add or to delete nodes near my structure. (to avoid the error message: non positive volume exist)

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