Calculate velocity components from shear stress -- CFD Online Discussion Forums

August 29, 2011, 12:07	Calculate velocity components from shear stress	#1
Arnoldinho Senior Member Arne Stahlmann Join Date: Nov 2009 Location: Hanover, Germany Posts: 209 Rep Power: 17	Hi all, Regarding this thread http://www.cfd-online.com/Forums/ope...interfoam.html, the shear stress at the boundary can be calculated either as tau = mu * (dU/dy), or by the Reynolds Stress Tensor. The shear velocity can be calculated as u* = sqrt(tau/rho). In terms of calculating the absolute (magnitude) value, this is not a problem. But how can I (technically) calculate the velocity components x, y, z, i.e. shear velocity components, assuming I have a 3D space? I'm not aware of any rule calculating the square root of a vector/tensor. Any hints? Arne

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