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-   -   How to calculate turbulent shear stresses (http://www.cfd-online.com/Forums/openfoam/106514-how-calculate-turbulent-shear-stresses.html)

danielec87 August 30, 2012 18:25

How to calculate turbulent shear stresses
 
Hello,
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...

THANK YOU!


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