# How to get the wall shear stress by UDF

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 June 24, 2003, 12:13 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, 12:17 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.

 May 21, 2010, 09:32 #3 New Member   Join Date: Jun 2009 Posts: 14 Rep Power: 16 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, 06:03 hi #4 Member   Qureshi M Z I Join Date: Sep 2013 Posts: 78 Rep Power: 12 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

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