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-   -   negative volume in gambit (http://www.cfd-online.com/Forums/openfoam-meshing-other/88659-negative-volume-gambit.html)

sofie1 May 23, 2011 08:29

negative volume in gambit
 
Hello every body;
I am trying to mesh a wavy wall cylindrical geometry with gambit for exporting it to fluent,but i encounter a problem in meshing edge and volume i d'nt anderstand what is the mean of mesh of volume contains skewed elements(equisize skew>0.97) volume contains 3458inverted elements (negative volume), with this message i can't checking this mesh in fluent ,how can i correct this error?

-mAx- May 25, 2011 01:05

go back to gambit, and use the examine mesh tool to localize where are the skewed cells

sofie1 May 25, 2011 14:56

thanks, but i don't know how to use this function

tom634 January 17, 2012 09:16

Is it necessary to repair it?

-mAx- January 17, 2012 09:24

try to run your model with this mesh... and you will have your answer
;)

tom634 January 17, 2012 20:08

How much probability is that I have "Divergence detected in AMG Solver: pressure correction" error in Fluent by negative (inverted) volumes? I have boundary conditions for pressure inlet and outlet. Any models (k-eps, laminar etc.) and changing other parameters don't change the situation.
How to remove negative (inverted) volumes in Gambit? I have 0,00536% of inverted volumes for mesh of spiral of axial compressor.

-mAx- January 18, 2012 02:34

WIth negative volumes, the solver shouldn't start.
Try to know, what generates those negative volumes.
In gambit go to examine mesh, select volume, and set the upper limit to 0.
It will display all the negative cells.


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