How to calculate turbulent shear stresses -- CFD Online Discussion Forums

August 30, 2012, 19:25	How to calculate turbulent shear stresses	#1
danielec87 New Member Join Date: Jul 2012 Posts: 14 Rep Power: 14	Hello, I am using OpenFoam to compute turbulent flows... I would like to calculate the turbulent shear stress, which is defined as u'v'=2nutSij*Sij where nut is the turbulent kinematic viscosity, while Sij is, by definition, the derivative of velocity (Sij=DUi/DXj). The question is: How to say how to calculate the derivatives of velocity to OpenFoam?? Or, by the way, how to calculate any other value I need, besides pressure and velocity... THANK YOU!

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