friction lengthscale -- CFD Online Discussion Forums

June 18, 2020, 06:01	friction lengthscale	#1
Issa New Member Join Date: Nov 2009 Posts: 12 Rep Power: 16	Hi, As I know that the turbulent models or wall functions can solve the fully rough (s/deltav >>1) or fully smooth(s/deltav <<1) surfaces. Hence, to know whether my case is fully rough or fully smooth, I need to determine the ratio (s/deltav). So, how can I determine the friction lengthscale (deltav)? where "s" is the roughness "deltav" is the friction lengthscale. Issa

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