Check case help

jarobbins3 · June 27, 2011, 16:33

hey guys im getting this error for check case..

"maximum cell skewness is greater than 0.98. consider improving the mesh quality before proceeding with your simulation."

also in the text window
"skewness exceeded 0.98 at 15 cells on thread ID = 3.Skewness exceeded 0.98 at 15 cells on thread ID = 3."

can anyone explain:
-What it cell skewness is?
-if this is causing in major errors in the caculations?
-and possible solutoins.

thanks!

-mAx- · June 28, 2011, 01:23

your mesh contains cells with poor quality.
http://my.fit.edu/itresources/manual...equiangle_skew

Fix this issue by modifiying topology (merge,split, etc...) and/or remeshing

AdrienL · June 30, 2011, 10:21

A simulation with cell skewness greater than 0.98 will run but will give awful results such as acceleration of the flow in the middle of nowhere.

You should thing about remeshing the surface mesh (surface skewness < 0.5 will help you to have a cell skewness < 0.9), or using tools such as auto node move (in Tgrid 3d)

Adrien

Btw, to have good results the cell skewness should be less than 0.9 at least

jarobbins3 · June 30, 2011, 11:55

Thanks for the help, im using workbench to generate my mesh. What are there imputs that are variable to limit the skewness?

AdrienL · June 30, 2011, 16:43

Sorry, can't help you with workbench. I never used it, but you have to make your triangular mesh as equilateral as possible and then the cell skewness will be good too

June 27, 2011, 16:33	Check case help	#1
jarobbins3 New Member J. Robbins Join Date: Jun 2011 Posts: 3 Rep Power: 14	hey guys im getting this error for check case.. "maximum cell skewness is greater than 0.98. consider improving the mesh quality before proceeding with your simulation." also in the text window "skewness exceeded 0.98 at 15 cells on thread ID = 3.Skewness exceeded 0.98 at 15 cells on thread ID = 3." can anyone explain: -What it cell skewness is? -if this is causing in major errors in the caculations? -and possible solutoins. thanks!

June 28, 2011, 01:23		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	your mesh contains cells with poor quality. http://my.fit.edu/itresources/manual...equiangle_skew Fix this issue by modifiying topology (merge,split, etc...) and/or remeshing __________________ In memory of my friend Hervé: CFD engineer & freerider

June 30, 2011, 10:21		#3
AdrienL Member Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 14	A simulation with cell skewness greater than 0.98 will run but will give awful results such as acceleration of the flow in the middle of nowhere. You should thing about remeshing the surface mesh (surface skewness < 0.5 will help you to have a cell skewness < 0.9), or using tools such as auto node move (in Tgrid 3d) Adrien Btw, to have good results the cell skewness should be less than 0.9 at least __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

June 30, 2011, 16:43		#5
AdrienL Member Adrien Lemoine Join Date: Jun 2011 Location: Paris,France Posts: 31 Rep Power: 14	Sorry, can't help you with workbench. I never used it, but you have to make your triangular mesh as equilateral as possible and then the cell skewness will be good too __________________ ------------------------------------------- Plz add reputation if the answer is correct A cœur vaillant rien d'impossible ------------------------------------------

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June 30, 2011, 11:55		#4
jarobbins3 New Member J. Robbins Join Date: Jun 2011 Posts: 3 Rep Power: 14	Thanks for the help, im using workbench to generate my mesh. What are there imputs that are variable to limit the skewness?