Estimation of First Grid Point Near Wall

April 24, 2006, 14:01

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???

April 25, 2006, 10:47

Yes, it is perfectly fine... Use Cf value according to ur flow calculations...I mean for Turbulent flows..

April 25, 2006, 12:49

have a look at

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

Ralf

April 24, 2006, 14:01	Estimation of First Grid Point Near Wall	#1
Amer Mahmood Guest Posts: n/a	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???

April 25, 2006, 10:47	Re: Estimation of First Grid Point Near Wall	#2
Rags Guest Posts: n/a	Yes, it is perfectly fine... Use Cf value according to ur flow calculations...I mean for Turbulent flows..

April 25, 2006, 12:49	Re: Estimation of First Grid Point Near Wall	#3
Ralf Schmidt Guest Posts: n/a	have a look at http://www.cfd-online.com/Forum/main...cgi?read=44320 Ralf

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