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Estimation of First Grid Point Near Wall

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Old   April 24, 2006, 13:01
Default Estimation of First Grid Point Near Wall
  #1
Amer Mahmood
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Hi, Iam simulating flow in a rectangular channel and using enhanced wall treatment in Fluent. For estimation of Ist grid point (y+=1) I am using the following relation:

y+=(density)*(yp)*(turbulent velocity)/(dynamic viscosity); turbulent velocity = average velocity * SQRT(Cf/2)

where yp = distance from the wall

Cf = friction coefficient

Is this process fine???
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Old   April 25, 2006, 09:47
Default Re: Estimation of First Grid Point Near Wall
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Rags
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Yes, it is perfectly fine... Use Cf value according to ur flow calculations...I mean for Turbulent flows..
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Old   April 25, 2006, 11:49
Default Re: Estimation of First Grid Point Near Wall
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Ralf Schmidt
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have a look at

http://www.cfd-online.com/Forum/main...cgi?read=44320

Ralf
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