|October 11, 2011, 08:56||
Surface y+ problem
Join Date: Aug 2011
Posts: 17Rep Power: 7
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||
Join Date: Jun 2011
Posts: 129Rep Power: 9
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.
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