reynolds shear stress
 

How can I build a scalar scene for the Reynolds shear stress?I have to select some in the physics model?or something else?
In the field functions this stress doesn't appear!!!
I am using k-epsilon model or k-omega model for the turbolence!
Thanks to all!
Lorenzo

I think you have to write your own unless the RST model is activated. At least that's what I had to do.

here is what I had in 2D, it was supposed to give me a vector: RS[ii],RS[jj],RS[ij] but the last term [ij] is wrong as I wasn't sure how to get du/dy, or dv/dx (simply). I abandoned it as I had other more pressing things to work on.

[
2*$TurbulentViscosity*(grad(mag($$Velocity))[1])-(2/3)*$Density*$TurbulentKineticEnergy,

2*$TurbulentViscosity*(grad(mag($$Velocity))[2])-(2/3)*$Density*$TurbulentKineticEnergy,

2*$TurbulentViscosity*(grad(mag($$Velocity))[3])]


it came from http://www.cfd-online.com/Wiki/Bouss...ity_assumption
with StarCCM defining the strain rate tensor in eqn [306] (Search StarCCM Help)

If you come up with an answer though it would be helpful.

Can't you just multiply the velocity correlations, e.g., uu, by the density? The velocity correlations are directly extractable from CFX-Post.