Dynamic meshing in CFX: (negative volume error)

michael_owen · October 18, 2010, 06:52

Check your working directory in the cfx launcher. Make sure it points to where the def and ICEM files are located.

vmlxb6 · October 18, 2010, 15:53

Does anyone know what mesh morphing actually is ??? A ppt on the ANSYS site talks about mesh morphing being used for large mesh deformation and to avoid re-meshing.I gives the example of ball valve and butterfly valve tutorial. My case is very similar to the ball valve.
But I cannot find any particular tutorial or theory on it ???

Thank you.

ghorrocks · October 18, 2010, 17:45

The CFX tutorial titled "Fluid Structure Interaction and Mesh Deformation" sounds like a good place to start. There are several other moving mesh tutorials which come with CFX.

Bdew8556 · April 2, 2020, 11:06

Hey guys,

I'm not using any dynamic or moving mesh and I"m still getting this error. I'm trying to mesh for a centrifugal compressor.

Any thoughts?

AtoHM · April 2, 2020, 15:44

If you get this error but don't use moving mesh, your mesh is bad in the first place or am I missing something. Did you check your mesh quality prior to starting the simulation?

ghorrocks · April 2, 2020, 18:19

As AtoHM states, your mesh must have an element which has turned inside out. Go back to your meshing software and do some mesh quality checks. You should be able to find the bad elements. How to fix it will depend on what meshing software you are using, but you need to generate a mesh which does not have any inside out elements.

October 18, 2010, 15:53	mesh morphology	#22
vmlxb6 Senior Member Ugly Kid Joe Join Date: Aug 2010 Posts: 193 Rep Power: 15	Does anyone know what mesh morphing actually is ??? A ppt on the ANSYS site talks about mesh morphing being used for large mesh deformation and to avoid re-meshing.I gives the example of ball valve and butterfly valve tutorial. My case is very similar to the ball valve. But I cannot find any particular tutorial or theory on it ??? Thank you.

April 2, 2020, 18:19		#26
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	As AtoHM states, your mesh must have an element which has turned inside out. Go back to your meshing software and do some mesh quality checks. You should be able to find the bad elements. How to fix it will depend on what meshing software you are using, but you need to generate a mesh which does not have any inside out elements. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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October 18, 2010, 06:52		#21
michael_owen Senior Member Michael P. Owen Join Date: Mar 2009 Posts: 196 Rep Power: 17	Check your working directory in the cfx launcher. Make sure it points to where the def and ICEM files are located.

October 18, 2010, 17:45		#23
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The CFX tutorial titled "Fluid Structure Interaction and Mesh Deformation" sounds like a good place to start. There are several other moving mesh tutorials which come with CFX.

April 2, 2020, 11:06		#24
Bdew8556 Senior Member Brett Join Date: May 2013 Posts: 212 Rep Power: 13	Hey guys, I'm not using any dynamic or moving mesh and I"m still getting this error. I'm trying to mesh for a centrifugal compressor. Any thoughts?

April 2, 2020, 15:44		#25
AtoHM Senior Member M Join Date: Dec 2017 Posts: 642 Rep Power: 12	If you get this error but don't use moving mesh, your mesh is bad in the first place or am I missing something. Did you check your mesh quality prior to starting the simulation?