# Wall functions

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 October 21, 2011, 14:34 Wall functions #1 New Member   Deepchand Singh Negi Join Date: Oct 2011 Posts: 12 Rep Power: 8 What should be wall functions (in realizable K-Epsilon model) for y+ < 1 y+= 5-10 y+> 30 And what exactly the physics behind the choosing these different wall functions

 October 22, 2011, 00:13 #2 New Member     sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 8 Hey, You need not define any wall function in different flow regimes. In Enhanced wall function option Fluent will actually solve N-S 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

 October 22, 2011, 01:07 #3 New Member   Deepchand Singh Negi Join Date: Oct 2011 Posts: 12 Rep Power: 8 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 Non-Equilibrium wall function)

 October 22, 2011, 01:28 #4 New Member     sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 8 I don't know what is 'non-equilibrium wall fn', standard wall function is good enough for both the cases.

 October 22, 2011, 01:41 #5 New Member   Deepchand Singh Negi Join Date: Oct 2011 Posts: 12 Rep Power: 8 ok thanks buddy

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