Question about Low Re turbulence modelling.

ghlee

Hi! Friends. I had implemented the Chien's low Re Number Turbulence Modelling . But I had a problme to calculate the dimensionless distance, y+. y+ is generally expressed in the following form. y+ = u* y/nu In above expression, friction velocity, u* ,is equal to sqrt(tau_w / rho ). What is the concrete definition of tau_w ? Would you like to inform me the implementation method of tau_w? For example, as laminar flow, does tau_w have only the form, mu (partial U /partial y)? Is it right?

Thank you.