Wall functions
What should be wall functions (in realizable KEpsilon model) for
y+ < 1 y+= 510 y+> 30 And what exactly the physics behind the choosing these different wall functions 
Hey,
You need not define any wall function in different flow regimes. In Enhanced wall function option Fluent will actually solve NS eqns to find flow pattern (more accurate). Standard wall function is just an interpolation (less accurate). But since Enhanced wall function actually solves the flow you have to make sure that your first grid point lies in distance y+ < 5 (viscous sublayer) There is no y+ < 1 rule as u said. Regards Sabin Mathew:) 
thank it was useful
one more thing for enhanced wall function we need the first cell size with y+<5 say if i want or say created another geometry with y+=10 for first cell and again another with y+=30 for first cell what wall function should I use for those two cases (say Standard Wall Function or NonEquilibrium wall function) 
I don't know what is 'nonequilibrium wall fn', standard wall function is good enough for both the cases.

ok thanks buddy

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