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Old   February 18, 2010, 10:44
Question negative volume error
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Amrit
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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!!!
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Old   February 19, 2010, 02:14
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Maxime Perelli
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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?
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Old   February 20, 2010, 01:20
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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...
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Old   February 25, 2010, 13:26
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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
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Old   February 26, 2010, 02:07
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Quote:
Originally Posted by aounallah View Post
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
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Old   February 26, 2010, 02:08
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Quote:
Originally Posted by aounallah View Post
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)
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Last edited by -mAx-; February 26, 2010 at 02:15. Reason: explanation
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