# Enhanced wall treatment and Enhanced wall functions

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 January 1, 2012, 23:38 Enhanced wall treatment and Enhanced wall functions #1 New Member   Join Date: Mar 2009 Posts: 5 Rep Power: 10 Sponsored Links Hello, I'm reading the help of FLUENT_6.3.26 and now in the enhanced wall treatment section. Here it says the enhanced wall treatment is available with k-epsilon and RSM while the enhaced wall functions are available with SA, k-omega, and LES, which means the enhanced wall functions are not available with k-epsilon. (right?) But at the first part of the this section, it says the enhanced wall functions are used with coarse meshes and FLUENT can combine the two-layer model with enhanced wall functions. So if I use k-epsilon model and choose the enhanced wall treatment, what will FLUENT choose when the meshes are not fine enough for the two-layer model which is employed in the enhanced wall treatment?

 January 2, 2012, 06:41 #2 Senior Member   duri Join Date: May 2010 Posts: 160 Rep Power: 9 Enhanced wall functions/treatments are not for coarser mesh. Its for mesh size inbetween standard wall function Y+ and viscous sublayer y+. If there is a variation of y+ in this regime enhanced wall function can handle this.

 January 3, 2012, 19:48 #3 New Member   Join Date: Dec 2011 Posts: 10 Rep Power: 7 Enhanced Wall Treatment: EWT is used to solve mesh with Y+ between 1 and 5 EWT is available with k-epsilon. However, if your mesh is too coarse for this Y+ and your Y+ value is between 30 and 300 (please avoid between 5 and 30 for Y+) then EWT s like a simple wall treatment and start like the first point is outside of the exponential part of the Boundary Layer. In 2 words, EWT is not taken into account if Y+ is over 30 even if the option is quoted. The solution will be less accurate but you 'll get a solution. bhajneets likes this.

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