# scalable wall function, 3<y+<11

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 March 20, 2013, 00:55 scalable wall function, 3

 December 10, 2014, 11:13 #2 Member   Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 97 Rep Power: 7 Hi, I know it is a quite an old post but I find myself in exactly the same situation. What approach did you follow? Cheers Andrea

 December 10, 2014, 22:53 #3 Senior Member   François Grégoire Join Date: Jan 2010 Location: Laval University, Canada Posts: 381 Rep Power: 9 In the end I used enhanced wall treatment because it blends linear and logarithmic laws. From theory guide 15.0 section 4.14.5.2: This formula also guarantees the correct asymptotic behavior for large and small values of y+ and reasonable representation of velocity profiles in the cases where y+ falls inside the wall buffer region (3 < y+ < 10).

 December 11, 2014, 06:55 #4 Member   Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 97 Rep Power: 7 I was thinking to do the same. What do you reckon is the minimum number of prism layers to be used with this approach? I am aware that if you want to integrate NS equations up to the wall (i.e. EWT with first cell y+ at about 1) you need at least 10 cells within the boundary layer. However this not the approach I am going to follow, since most of my cells are in the log layer (y+ of about 60) and I only have three prism layers. Is that enough with EWT? and with scalable wall functions? Andrea

 December 11, 2014, 10:52 #5 Member   davide basso Join Date: Jan 2012 Posts: 48 Rep Power: 6 Hi all, since (if I got it right) near wall analysis it's not a goal for you, maybe you could just coarsen the mesh in order to have y+>30 everywhere and then use the standard wf.

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