Frictional Velocity + LES

Harry

Hi all,

I have found this site very very useful for my study, and I think I can get a very good reply for my question.

I am trying to simulate Channel Flow using LES, can some one tell me how to go about calculating iteratively the Frictional Velocity (U_tau) and Yplus, in order to apply the log law along the wall of the channel, I found this method metioned by Piomelli and Balaras, in their paper " WAll-Layer models for LES", but I am stuck about in calculating the the U_tau and Yplus.

Ur help will be highly appreciated,

Thanks in advance,

Harry.