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How to calculate turbulent shear stresses

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Old   August 30, 2012, 18:25
Default How to calculate turbulent shear stresses
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I am using OpenFoam to compute turbulent flows...
I would like to calculate the turbulent shear stress, which is defined as u'v'=2*nut*Sij*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...

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