Scalar shear stress expression
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Hi
I need to define an expression for calculating scalar shear stress on a rotating impeller. I have to specify all six component of the stress tensor in this expression. but I can specify 3 component ,I mean wall shear X,Y and Z. how can i define zx,zy and xy component? thanks for any response. 
The usual definition is the sigma(xx)/(yy)/(zz) are the normal stresses and these are calculated from the pressure. The cross terms sigma(xy) are the tangential stresses which are from the wall shear stress.

Hi
I have a problem. a cant expression shear stress and normal stress at cfdpost by polyflow solver, and velocity gradient at 3 narrow please help me? 
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