Different results from similar quality cfx and ICEM meshes

Nick R · January 14, 2011, 03:25

Hi all,

I've created two meshes with the same geometry one in cfx and the other in ICEM. The mesh quality in both is nearly the same. However with the one from ICEM I get a floating point error whereas the one created in CFX converges nicely. I don't know what's the deal. Although I set the same Boundary Condition for both cases. Everthing else is exactly the same.
Both are unstructured meshes by the way.

Generally I get a lot of overflow (floating point) errors from ICEM meshes.
Should the boundary conditions be defined in ICEM or is it sufficient to do so in cfx solver *which is what I do after i import from ICEM*. Thanks for any comments in advance.

ghorrocks · January 15, 2011, 07:34

Assuming there is no error in your ICEM mesh, then your assessment that the mesh quality is almost the same is obviously not correct.

Nick R · January 16, 2011, 05:03

Thanks for the reply. Strangely I get this overflow error message with meshes from ICEM. I don't know what I'm doing wrong. The same geometry and boundary conditions for a mesh generated by cfx mesh work fine.

paulo · January 17, 2011, 08:48

Hello,

In your simulation's .out file there are mesh quality statistics. Try to compare them.

Best Regards,

Paulo Rocha

January 14, 2011, 03:25	Different results from similar quality cfx and ICEM meshes	#1
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	Hi all, I've created two meshes with the same geometry one in cfx and the other in ICEM. The mesh quality in both is nearly the same. However with the one from ICEM I get a floating point error whereas the one created in CFX converges nicely. I don't know what's the deal. Although I set the same Boundary Condition for both cases. Everthing else is exactly the same. Both are unstructured meshes by the way. Generally I get a lot of overflow (floating point) errors from ICEM meshes. Should the boundary conditions be defined in ICEM or is it sufficient to do so in cfx solver which is what I do after i import from ICEM. Thanks for any comments in advance.

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January 15, 2011, 07:34		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Assuming there is no error in your ICEM mesh, then your assessment that the mesh quality is almost the same is obviously not correct.

January 16, 2011, 05:03		#3
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	Thanks for the reply. Strangely I get this overflow error message with meshes from ICEM. I don't know what I'm doing wrong. The same geometry and boundary conditions for a mesh generated by cfx mesh work fine.

January 17, 2011, 08:48		#4
paulo Member Paulo Alexandre Costa Rocha Join Date: Mar 2009 Posts: 71 Rep Power: 17	Hello, In your simulation's .out file there are mesh quality statistics. Try to compare them. Best Regards, Paulo Rocha