[Commercial meshers] negative volume in gambit

sofie1 · May 23, 2011, 08:29

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.

May 23, 2011, 08:29	negative volume in gambit	#1
sofie1 Member sofia Join Date: Apr 2010 Location: world Posts: 31 Rep Power: 16	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?

May 25, 2011, 01:05		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	go back to gambit, and use the examine mesh tool to localize where are the skewed cells __________________ In memory of my friend Hervé: CFD engineer & freerider

January 17, 2012, 09:24		#5
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	try to run your model with this mesh... and you will have your answer __________________ In memory of my friend Hervé: CFD engineer & freerider

January 18, 2012, 02:34		#7
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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. __________________ In memory of my friend Hervé: CFD engineer & freerider

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May 25, 2011, 14:56		#3
sofie1 Member sofia Join Date: Apr 2010 Location: world Posts: 31 Rep Power: 16	thanks, but i don't know how to use this function

January 17, 2012, 09:16		#4
tom634 New Member Join Date: Apr 2011 Posts: 29 Rep Power: 15	Is it necessary to repair it?

January 17, 2012, 20:08		#6
tom634 New Member Join Date: Apr 2011 Posts: 29 Rep Power: 15	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.