# Surface y+ manual calculation

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 October 11, 2011, 08:56 Surface y+ problem #1 New Member   Join Date: Aug 2011 Posts: 17 Rep Power: 7 Hi guys, I need toget the surface y+ results for internal flow. I have the following equation now, but it's not showing me the correct values. Could somebody give me a solution for this. surface_yplus = (y_velocity*cell_size)/char_viscosity; The y_velocity is the downstream velocity direction. The cell_size is different for each region in the geometry and the char_viscosity is just a constant. ps. It's a low speed simulation (0.75 m/s) Thanks in advance. Last edited by Yur; October 11, 2011 at 10:00.

 October 23, 2011, 12:53 #2 Senior Member   Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 129 Rep Power: 9 Hi Yur, may be it's late: Check your formula again and compare with http://www.cfd-online.com/Wiki/Dimen...e_%28y_plus%29 u_star is not the downstream velocity. When you follow the link for friction velocity one gets: u_star = sqrt( tau_w / rho ) Follow the link for wall shear stress to get a formula to compute tau_w. I hope this is helpful. Sebastian.

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