|June 5, 2010, 11:09||
Reynolds Stresses in Fluent
Join Date: Jun 2010
Posts: 4Rep Power: 5
I am working the Re=3900 2-D cylinder problem for a turbulence class in graduate school. We were to use the k-e and k-w turbulence models and plot uu Reynolds stress profiles to compare to Kravchenko's paper.
How do I back out the Reynolds stress components I need from the turbulent quantities given by these two models? I imagine I just use the Bouss Approx, and write a UDF to plot them, but I've never used the UDF's.
Can someone give me some idiot-proof step by step instructions on how to do this?
|February 1, 2012, 12:57||
Join Date: Mar 2011
Posts: 6Rep Power: 4
You have to use Bous. Approx.
Use the Define->Custom Field Functions to calculate
delu=dx-velocity-dx + dy-velocity-dy + dz-velocity-dz
then calculate strain rate tensor S_uu
S_uu=dx-velocity-dx - 1 / 3 * dukxk
-u'u'=2*viscosity-turb*S_uu/density - 2/3*turb-kinetic-energy
|boussinesq, reynolds, stress|
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