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-   -   Skewness (http://www.cfd-online.com/Forums/fluent/36272-skewness.html)

Taskin April 5, 2005 07:21

Skewness
 
hi, I have a 3D model that have high skewness values. However whatever I do for lowering skewness values didn't work. The worst element has a skewness of 0.82. What should the limits of skewness be for analyzing a turbulent flow of air around a body? is 0.82 anyway ok? Thanks Regards Taskin

dirk April 5, 2005 07:29

Re: Skewness
 
I have read that maximum skewness value should be around 0.5.

Taskin April 5, 2005 07:42

Re: Skewness
 
then I should decrease it in some way thanks Regards Taskin

handou April 5, 2005 08:32

Re: Skewness
 
what? the max skewness should be 0.5? in my mesh ,it often exceeds 0.9. because i use dynamic mesh, sometimes over 0.95, and there will be a warning. so, i should remash it?

Luca April 5, 2005 09:25

Re: Skewness
 
Yes, handou is right. The limit should be anyway 0.9 not to have excessive skewness. Luca

Riaan April 6, 2005 15:21

Re: Skewness
 
From my experience, try to stay under 0.75.

Up to 0.85 is acceptable, but not good. Above 0.98 - and Fluent Grid check will fail.

Also when you use such skew cells, it makes sense to go to 2nd order methods for density, momentum etc.


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