Scalar shear stress expression
 

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 cfd-post by polyflow solver, and velocity gradient at 3 narrow please help me?