# reynolds shear stress

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 March 28, 2010, 19:15 reynolds shear stress #1 New Member   lorenzo.iovio Join Date: Jan 2010 Posts: 5 Rep Power: 9 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

 March 29, 2010, 13:48 #2 New Member   Pete Launie Join Date: Feb 2010 Posts: 10 Rep Power: 9 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.

 July 8, 2010, 16:25 #3 Senior Member   Joshua Counsil Join Date: Jul 2009 Location: Halifax, Nova Scotia, Canada Posts: 366 Rep Power: 11 Can't you just multiply the velocity correlations, e.g., uu, by the density? The velocity correlations are directly extractable from CFX-Post.

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