Velocity gradient -- CFD Online Discussion Forums

April 7, 2003, 11:28	Velocity gradient	#1
Stephen Guest Posts: n/a	This question is related to the wall friction velocity U* in the log law function. It is well know that the function is sensitive to variations in y+, therefore it is also sensitive to the velocity gradient. This leads on to my Question "How do most commercial codes obtain/calculate the velocity gradient at the wall?" Or is at simple as calculating the velocity difference over the height of the cell du/dy? Stephen

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