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FSI using CT-images - need more geometries!?

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Old   August 6, 2008, 09:48
Default FSI using CT-images - need more geometries!?
  #1
Liza
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Hi all,

I have a geometry from CT-images at four different times which I want to perform a FSI-simulation on. It's 0.25 s between each geometry, and I want to get more geometries to be able to do a more realistic FSI. I have looked into tutorial 20 (check valve with 20 meshes) and it seems to suit me, the only thing I need now is the meshes.

So my problem is that I only have 4 geometries and I need 100. Is there an easy way to "interpolate" and save geometries in CFX or do I need to use an external CAD program?

Or should I do it in some other way?

Cheers Liza
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Old   August 6, 2008, 10:50
Default Re: FSI using CT-images - need more geometries!?
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Jorn
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I know people use the software Mimics to generate meshes from CT images for use in Ansys/CFX. I don't know if it can interpolate though.
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Old   August 6, 2008, 13:19
Default Re: FSI using CT-images - need more geometries!?
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Rogerio Fernandes Brito
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Please, Mr. Liza, tell us about this scheme. I didnīt understand very much this methodology. Thanks
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Old   August 7, 2008, 03:14
Default Re: FSI using CT-images - need more geometries!?
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Liza
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First of all, it's MISS and not MR...

So, say that I have a geometery at time = 0 and one geometry at time = 0.25, 0.75, and 1.00. To be able to perform a FSI in the same way as in tutorial 20, I need meshes at time = 0.01, 0.02, 0.03 and so on, if my time step is going to be 0.01.

So I was wondering if CFX has any capabilities to perform a interpolation between time = 0 and 0.25 to get the intermediate geometries, or if I have to use another CAD program.

Or (preferably?) if I can solve my problem in another way?

Cheers Liza
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Old   August 7, 2008, 08:37
Default Re: FSI using CT-images - need more geometries!?
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Rogerio Fernandes Brito
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Did your geometry change with the time?
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Old   August 7, 2008, 09:31
Default Re: FSI using CT-images - need more geometries!?
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Liza
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Yes of course - thats why Im trying to do a one-way FSI...
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Old   August 7, 2008, 22:32
Default Re: FSI using CT-images - need more geometries!?
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Rogerio Fernandes Brito
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Thanks lady Lisa!
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Old   August 8, 2008, 03:47
Default Re: FSI using CT-images - need more geometries!?
  #8
Liza
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??
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Old   August 8, 2008, 16:42
Default Re: FSI using CT-images - need more geometries!?
  #9
brunoc
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Sorry, Post won't do that for you. You'll have to do it externally.
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Old   August 11, 2008, 07:14
Default Re: FSI using CT-images - need more geometries!?
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Liza
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I was thinking that it might be possible in cfx pre? Or doing something with junction box routines and write new intermediate meshes?
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Old   August 11, 2008, 19:04
Default Re: FSI using CT-images - need more geometries!?
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brunoc
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No, Pre won't interpolate geometries. You can probably do it with the meshing API. It is still done outside CFX, though.
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Old   August 12, 2008, 10:33
Default Re: FSI using CT-images - need more geometries!?
  #12
Liza
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Ok, I'll give it a try. Thanks for your help.
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