negative volume error

amrit · February 18, 2010, 10:44

while iterating a case of dynamic meshing, using FLUENT 6.2.16, i got a "negative volume error"... can ne1 plz tell me the various possibilities for the above mentioned error..plzz help..

... thank you!!!

-mAx- · February 19, 2010, 02:14

Investigate the reason for negative volume.
Typically it is a MDM parameter issue.
It can ba also due to a high time step.
Did you check your mesh motion?

amrit · February 20, 2010, 01:20

yeah..i checked mesh motion... it worked out well with 0.00005 s as time step bt showed the error when i increased the time step to about 0.007s... may b its due to "time step" in my case... thanks a lot...

aounallah · February 25, 2010, 13:26

the minimum negative volume is due to grid generation
any grid had this message when you check it, the calculation don't start
return to gmabit and verify the mesh first

-mAx- · February 26, 2010, 02:07

Quote:

Originally Posted by aounallah

the minimum negative volume is due to grid generation
any grid had this message when you check it, the calculation don't start
return to gmabit and verify the mesh first

No correlation with Gambit

-mAx- · February 26, 2010, 02:08

Quote:

Originally Posted by aounallah

the minimum negative volume is due to grid generation
any grid had this message when you check it, the calculation don't start
return to gmabit and verify the mesh first

His initial mesh should be fine, and the error appears as the mesh is moving.
So it is a MDM issue, and it should be solved within Fluent. Gambit has nothing to do with Remeshing stuffs (Moving mesh)

February 18, 2010, 10:44	negative volume error	#1
amrit New Member Amrit Join Date: Aug 2009 Posts: 4 Rep Power: 17	while iterating a case of dynamic meshing, using FLUENT 6.2.16, i got a "negative volume error"... can ne1 plz tell me the various possibilities for the above mentioned error..plzz help..... thank you!!!

February 19, 2010, 02:14		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	Investigate the reason for negative volume. Typically it is a MDM parameter issue. It can ba also due to a high time step. Did you check your mesh motion? __________________ In memory of my friend Hervé: CFD engineer & freerider

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February 20, 2010, 01:20		#3
amrit New Member Amrit Join Date: Aug 2009 Posts: 4 Rep Power: 17	yeah..i checked mesh motion... it worked out well with 0.00005 s as time step bt showed the error when i increased the time step to about 0.007s... may b its due to "time step" in my case... thanks a lot...

February 25, 2010, 13:26		#4
aounallah New Member Join Date: Feb 2010 Posts: 7 Rep Power: 16	the minimum negative volume is due to grid generation any grid had this message when you check it, the calculation don't start return to gmabit and verify the mesh first