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-   -   y+ question (http://www.cfd-online.com/Forums/openfoam-solving/96328-y-question.html)

plm January 19, 2012 12:10

y+ question
 
Hi all,

From what I understand about LES wall functions, in order to use nuSgsWallFunction you should have a y+ > 30 which places your first computational cell away from the wall within the inertial sublayer....

My question is... does the wall function take into account if you have a y+ < 30 (i.e. your grid is finer 'than necessary' near the wall)? Couldn't Spaldings law (which I understand is the assumption made for the nuSgsWallFunction) just be extended to adjacent cells up to those cells which have the value of y+ required?
Hope this question makes sense....

Also, what are the alternatives to this wall function in OpenFOAM?

Hope someone can help. Thanks for your time.
Cheers,
plm

plm January 21, 2012 13:14

Any ideas anyone?
Does anyone have experience with LES wall functions for low y+?

plm


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