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October 27, 2011, 17:10
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Negative cell volume problem
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#1 |
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New Member
dandan xiao
Join Date: Oct 2011
Posts: 3
Rep Power: 15  |
I'm doing a dynamic mesh simulation with in-cylinder combustion. My mesh is OK when imported into fluent. However, I got this error after several itterations:
Updating mesh to time 4.00000e-04 (step = 00045) (crank-angle = 184.80)... Warning: non-positive volumes exist. Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: #f How can I fix this? |
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November 1, 2011, 15:15
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#2 |
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Member
Boudour
Join Date: Oct 2011
Posts: 34
Rep Power: 15 |
i have the same problem
the negative cell volume exists when i preview the apdating the mesh have you found the problem |
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November 2, 2011, 04:01
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negative volume
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#3 |
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Senior Member
Vaze
Join Date: Jun 2009
Posts: 172
Rep Power: 17 |
Hi schuny and roukaia
Please follow the strategy given in the tutorial on piston displacement because for such problem there should not be any problem. Regards mvee |
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November 3, 2011, 14:58
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#4 |
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Member
Boudour
Join Date: Oct 2011
Posts: 34
Rep Power: 15 |
thank you for replying
do you mean the tutoriel of dynamic mesh (smoothing layering ) regards |
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November 5, 2011, 04:09
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-ve volume
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#5 |
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Senior Member
Vaze
Join Date: Jun 2009
Posts: 172
Rep Power: 17 |
You can solve any problem based on smoothing and remeshing.
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November 5, 2011, 11:52
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GAMBIT :structured & unstructured mesh in one face
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#6 |
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Member
Boudour
Join Date: Oct 2011
Posts: 34
Rep Power: 15 |
dear mvee
yes i agree with you but i have also the layering method wich need a structured mesh (the layering zones valves must be in quadr) there is a joint piece for more details Attachment 9871 please have you got any idea about how to construct (a structured & unstructured mesh in one face in gambit because i think that 's the main problem of negative volume any will be appreciated Last edited by roukaia; January 9, 2012 at 13:52. |
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November 5, 2011, 11:59
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#7 |
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Member
Boudour
Join Date: Oct 2011
Posts: 34
Rep Power: 15 |
more details about my mesh and even the error in the joint piece
Updating mesh to time 3.88889e-04 (step = 00007) (crank-angle = 363.50)... Warning: negative volume detected --> repeat smoothing! Warning: negative volume detected --> repeat smoothing! Warning: negative volume detected --> repeat smoothing! Warning: non-positive volumes exist. Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: #f Last edited by roukaia; January 9, 2012 at 13:52. |
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November 5, 2011, 12:02
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need help for meshing in gambit
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#8 |
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Member
Boudour
Join Date: Oct 2011
Posts: 34
Rep Power: 15 |
more details about my mesh in the joint piece
Updating mesh to time 3.88889e-04 (step = 00007) (crank-angle = 363.50)... Warning: negative volume detected --> repeat smoothing! Warning: negative volume detected --> repeat smoothing! Warning: negative volume detected --> repeat smoothing! Warning: non-positive volumes exist. Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: #f Last edited by roukaia; January 9, 2012 at 13:52. |
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April 10, 2012, 06:16
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solution
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#9 |
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Senior Member
Vaze
Join Date: Jun 2009
Posts: 172
Rep Power: 17 |
Hi
Did you solve the issue? Pl update me. Regards mvee |
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