Two Ways FSI: How I can Export the Deformed Mesh back to the SolidWorks

ahmadkermani · August 13, 2009, 23:09

Hi,

I am doing FSI simulation of valve and at some point CFX can not move the mesh any more and I receive negative element error.
I was thinking of re-meshing and interpolating the old results into the new mesh and go on but to do this I have be able export the deformed structure to the CAD software.
Does anybody know how I can export a deformed geometry to CAD program (for example solidworks)?
The simplest way could be creating an IGES file but I don't know how to make it.

I appreciate your help.
Ahmad

basavaraj.pyati · August 16, 2009, 03:56

Hi,
Question is bit confusing,whether you want to export from post/pre or from meshing softwares.
Its possible only in meshing software where you can export to IGES format..

I feel you may be doing transient simulation in CFX,If that is the case to avoid this you can do following things,

1) mentain uniform mesh size at stationary and moving domain(Preferably hex mesh)

2) Set expert parameters like "Check isolated regions to false"

3) Your time step value (Very important)

ahmadkermani · August 17, 2009, 18:12

Hi,

To make my question clear, you know that one of the major problems in FSI is
mesh being folded (resulting negative element error) when the CFX is not able
to move the mesh anymore. One solution I thought is extracting the deformed
geometry of the structure at the point when the CFX can not move the mesh,
remesh it, interpolate the solution of into the new mesh and go on with FSI
analysis with new mesh.
Now the only way you can remesh the deformed domain is to have it
in a format (for example IGES) which you can open it in the CAD or mesh generator.

Simply I would like to exprot the deformed geometry from CFX-Post to my mesh generator.

Thank you for your help.

Ahmad

ikpekho2 · March 3, 2016, 08:24

Hi Ahmed,

Please I was wondering if you found the solution to your problem as I have a very similar problem.

Cheers.

ikpekho2 · March 3, 2016, 08:26

Quote:

Originally Posted by ikpekho2

Hi Ahmed,

Please I was wondering if you found the solution to your problem as I have a very similar problem.

Cheers.

cfd seeker · March 7, 2016, 11:13

Hi
I have not done any problem of such kind in CFX but I don't think it's possible because CFX is solving the mesh not the Geometry. It is the mesh from Meshing Software( like ICEM CFD) which we export for solution, not the geometry...isn't it?

tomson199 · March 8, 2016, 04:29

Hi,
You can convert mesh to parasolid file in FE Modeler. Drag the solution from static/transient structural to FE Modeler. In this link you've got an explanation how to make it:
https://caeai.com/sites/default/file...0Workbench.pdf

It's very simple.

Best regards

August 13, 2009, 23:09	Two Ways FSI: How I can Export the Deformed Mesh back to the SolidWorks	#1
ahmadkermani New Member Ahmad Kermani Join Date: Apr 2009 Posts: 3 Rep Power: 17	Hi, I am doing FSI simulation of valve and at some point CFX can not move the mesh any more and I receive negative element error. I was thinking of re-meshing and interpolating the old results into the new mesh and go on but to do this I have be able export the deformed structure to the CAD software. Does anybody know how I can export a deformed geometry to CAD program (for example solidworks)? The simplest way could be creating an IGES file but I don't know how to make it. I appreciate your help. Ahmad

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August 16, 2009, 03:56		#2
basavaraj.pyati New Member Basavaraj Join Date: Aug 2009 Posts: 4 Rep Power: 17	Hi, Question is bit confusing,whether you want to export from post/pre or from meshing softwares. Its possible only in meshing software where you can export to IGES format.. I feel you may be doing transient simulation in CFX,If that is the case to avoid this you can do following things, 1) mentain uniform mesh size at stationary and moving domain(Preferably hex mesh) 2) Set expert parameters like "Check isolated regions to false" 3) Your time step value (Very important)

August 17, 2009, 18:12		#3
ahmadkermani New Member Ahmad Kermani Join Date: Apr 2009 Posts: 3 Rep Power: 17	Hi, To make my question clear, you know that one of the major problems in FSI is mesh being folded (resulting negative element error) when the CFX is not able to move the mesh anymore. One solution I thought is extracting the deformed geometry of the structure at the point when the CFX can not move the mesh, remesh it, interpolate the solution of into the new mesh and go on with FSI analysis with new mesh. Now the only way you can remesh the deformed domain is to have it in a format (for example IGES) which you can open it in the CAD or mesh generator. Simply I would like to exprot the deformed geometry from CFX-Post to my mesh generator. Thank you for your help. Ahmad

March 3, 2016, 08:24		#4
ikpekho2 New Member Wil Join Date: Mar 2016 Posts: 2 Rep Power: 0	Hi Ahmed, Please I was wondering if you found the solution to your problem as I have a very similar problem. Cheers.

March 7, 2016, 11:13		#6
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	Hi I have not done any problem of such kind in CFX but I don't think it's possible because CFX is solving the mesh not the Geometry. It is the mesh from Meshing Software( like ICEM CFD) which we export for solution, not the geometry...isn't it?

March 8, 2016, 04:29		#7
tomson199 Member Thomas Join Date: Dec 2014 Location: Poland Posts: 49 Rep Power: 12	Hi, You can convert mesh to parasolid file in FE Modeler. Drag the solution from static/transient structural to FE Modeler. In this link you've got an explanation how to make it: https://caeai.com/sites/default/file...0Workbench.pdf It's very simple. Best regards