Cfx pre problems

rajale.manoj · April 15, 2014, 02:33

hi,
i have difficulty in import mesh file form ICEM to CFX pre. while running solver it shows negative volume. please help me to sort out problem

bharath · April 15, 2014, 02:50

Check your mesh quality in ICEM itself.

Try to improve mesh quality by smoothing and export it.

rajale.manoj · April 15, 2014, 03:27

hi,
i have mesh quality 0.3 in icem still it showing negative volume in cfx pre

ghorrocks · April 15, 2014, 05:46

Are you using mesh motion? If so this is a FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F

If this is not a mesh motion simulation: The default mesh quality checkers in ICEM do not count negative volume meshes as poor quality, even though the meshes are so bad as to be unusable. You can get this problem by smoothing too much in ICEM. To avoid the problem you need to only do mesh smoothing once in ICEM (unless you know what you are doing to avoid negative volume elements), or use other mesh quality metrics which will pick up the negative volume element.

April 15, 2014, 02:33	Cfx pre problems	#1
rajale.manoj New Member Manoj Join Date: Apr 2014 Posts: 5 Rep Power: 12	hi, i have difficulty in import mesh file form ICEM to CFX pre. while running solver it shows negative volume. please help me to sort out problem

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April 15, 2014, 02:50		#2
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Check your mesh quality in ICEM itself. Try to improve mesh quality by smoothing and export it.

April 15, 2014, 03:27		#3
rajale.manoj New Member Manoj Join Date: Apr 2014 Posts: 5 Rep Power: 12	hi, i have mesh quality 0.3 in icem still it showing negative volume in cfx pre

April 15, 2014, 05:46		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,706 Rep Power: 143	Are you using mesh motion? If so this is a FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F If this is not a mesh motion simulation: The default mesh quality checkers in ICEM do not count negative volume meshes as poor quality, even though the meshes are so bad as to be unusable. You can get this problem by smoothing too much in ICEM. To avoid the problem you need to only do mesh smoothing once in ICEM (unless you know what you are doing to avoid negative volume elements), or use other mesh quality metrics which will pick up the negative volume element.