# how to calculate y+

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 February 11, 2004, 09:42 how to calculate y+ #1 kat Guest   Posts: n/a How do you calculate y+ and in which range should it be?

 February 11, 2004, 10:46 Re: how to calculate y+ #2 Tim Guest   Posts: n/a hi, Y+ = Y/Nu * Utau Y = distance from the nearest wall, Nu = Kinematic viscosity, Utau = skin friction velocity. In the region nearest to the wall known as the viscous sublayer (Y+ <30) Utau is given by Newtons law - Utau = sqrt((Mu*(du/dy))/rho) Where Mu is dynamic viscosity = Nu*rho rho - density Outside the viscous sublayer the log-law is asssumed to aspply. This states U+ = (1/K) log(y+) + C or U+ = (1/K) Log(Ey+) With K= von Karman constant = 0.41 C = 5.5 or E = 9 Good luck Tim

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