How to get the wall shear stress by UDF

June 24, 2003, 13:13

I need the value of wall shear stress of the first cell close to a wall and use it to get the friction velocity by UDF. Is there any Macro available to do this? Also, is it possible to get the yplus of a cell near a wall (not necessary the first cell to the wall)?

Thanks a lot!!!

Quasar_89 · June 24, 2003, 13:17

The flow is turbulent and I use the RSM model.I want to fix the normal Reynolds stress component as an empirical function of y+. It is important to get the value of y+ or wall shear stress from which to get y +.

Hanz · May 21, 2010, 10:32

Hi,

I know the post was a while ago.

Did you find out how to access the wall shear stress using a UDF ?

m zahid · November 11, 2014, 07:03

hi, have u find the answer please share this, i want to calculate the wall shear and y plus at first node height and also the reynold number
thanks

June 24, 2003, 13:13	How to get the wall shear stress by UDF	#1
Chen Fangzhi Guest Posts: n/a	I need the value of wall shear stress of the first cell close to a wall and use it to get the friction velocity by UDF. Is there any Macro available to do this? Also, is it possible to get the yplus of a cell near a wall (not necessary the first cell to the wall)? Thanks a lot!!!

June 24, 2003, 13:17	Re: How to get the wall shear stress by UDF	#2
Chen Fangzhi Guest Posts: n/a	The flow is turbulent and I use the RSM model.I want to fix the normal Reynolds stress component as an empirical function of y+. It is important to get the value of y+ or wall shear stress from which to get y +. Quasar_89 likes this.

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May 21, 2010, 10:32		#3
Hanz New Member Join Date: Jun 2009 Posts: 14 Rep Power: 17	Hi, I know the post was a while ago. Did you find out how to access the wall shear stress using a UDF ?

November 11, 2014, 07:03	hi	#4
m zahid Member Qureshi M Z I Join Date: Sep 2013 Posts: 81 Rep Power: 13	hi, have u find the answer please share this, i want to calculate the wall shear and y plus at first node height and also the reynold number thanks