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January 1, 2013, 10:14 |
wall functions implementation
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#1 |
New Member
Join Date: Oct 2012
Posts: 15
Rep Power: 14 |
Hi OFers
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 Code:
epsEqn().boundaryManipulate(epsilon_.boundaryField()); 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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