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Old   April 25, 2005, 13:11
Default Wall functions
  #1
Taskin
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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
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Old   April 25, 2005, 13:40
Default Re: Wall functions
  #2
Zhang
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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
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Old   April 25, 2005, 14:23
Default Re: Wall functions
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Harish
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I think fluent automatically does it. Near the walls it used the wall functions

-H
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Old   April 25, 2005, 17:19
Default Re: Wall functions
  #4
Evan Rosenbaum
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If you use the transition option with k-w, you need to have y+ near 1, otherwise it uses wall functions.
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Old   April 26, 2005, 09:52
Default Re: Wall functions
  #5
Riaan
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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.
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Old   April 27, 2005, 14:00
Default Re: Wall functions
  #6
Taskin
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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
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Old   May 2, 2005, 02:53
Default Re: Wall functions
  #7
James Willie
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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
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Old   May 4, 2005, 11:59
Default Re: Wall functions
  #8
kamarul
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Try to ask your system administrator about the Fluent manual.

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