wall functions implementation
I have some questions about wall function implementations in OF.
a) For the Launder-Spalding wall function, first we calculate u_* from k , then we solve epsilon/omega equation fixing the near war cell value, then solve k and momentum equation. I see this in OF where epsilon is fixed
b) What if we fix the values at the boundary cell (not the first near war cell). It seems to me that this avoids
- The need to add contributions from two or more adjacent walls
- Manipulation of eps and k-equations to fix values
It may give bad results with coarse mesh though.
c) Finally are the LES wall functions same as RANS? I could not find wall functions directory in LES. What is the basic difference between nut and nusgs at near wall cells when both are modelled?
Thanks for any help
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