# Wall functions

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 April 25, 2005, 13:11 Wall functions #1 Taskin Guest   Posts: n/a hi, I wonder if k-w models also use wall functions? I heard that they were not using so our analysises should have y+ values between 1-10. But I couldn't find if k-w uses wall functions or not from the user guide. So I can't decide whether to hold y+ values between 1-10 or 30-90. Can anyone help me solving the situation? Regards Taskin

 April 25, 2005, 13:40 Re: Wall functions #2 Zhang Guest   Posts: n/a Did you read the User Guide? In Chapter 10, Modeling Turbulence, Sections 10.5, 10.8, 10.9 you can find the description. Good luck zhang

 April 25, 2005, 14:23 Re: Wall functions #3 Harish Guest   Posts: n/a I think fluent automatically does it. Near the walls it used the wall functions -H

 April 25, 2005, 17:19 Re: Wall functions #4 Evan Rosenbaum Guest   Posts: n/a If you use the transition option with k-w, you need to have y+ near 1, otherwise it uses wall functions.

 April 26, 2005, 09:52 Re: Wall functions #5 Riaan Guest   Posts: n/a For my cases, I have done both y+ =1 and y+>30 and at least of the k-e model, the results seem similar. Since the geometry of interest for my case is very small so y+=1 if the way to go.

 April 27, 2005, 14:00 Re: Wall functions #6 Taskin Guest   Posts: n/a okay thanks, I have built up a mesh that havey+=1 - 4.. its results are quite good with Spalart Allmaras. However drag coefficient is still lower than its real value Taskin

 May 2, 2005, 02:53 Re: Wall functions #7 James Willie Guest   Posts: n/a I am new to fluent and would want to understand the idea behind this Quick convection scheme. Where in the user manual can find information about it? Regards, James