Scalar shear stress expression

MUMMED · November 29, 2013, 14:59

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.

ghorrocks · November 30, 2013, 04:38

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.

mirzajani · April 27, 2014, 10:32

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?

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November 30, 2013, 04:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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.

April 27, 2014, 10:32		#3
mirzajani New Member omid Join Date: Apr 2014 Posts: 1 Rep Power: 0	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?