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-   -   how to determine friction velocity? (http://www.cfd-online.com/Forums/main/87905-how-determine-friction-velocity.html)

nickvinn May 2, 2011 10:05

how to determine friction velocity?
 
Hello!
What is the correct way to determine u_tau during computations (I need it to find y^+, to compare with law-of-the-wall, etc.):
1) u_tau=sqrt(mu*(dv/dy)/rho) (mu is molecular viscosity)
2) u_tau=sqrt((mu+mu_turb)*(dv/dy)/rho)
3) u_tau=karm*y*(dv/dy)
4) any other suggestions?


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