how to determine friction velocity? -- CFD Online Discussion Forums

May 2, 2011, 11:05	how to determine friction velocity?	#1
nickvinn New Member Nikolay Vinnichenko Join Date: Nov 2010 Posts: 14 Rep Power: 16	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=karmy(dv/dy) 4) any other suggestions?

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