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-   -   How to define Epsilon in RSM model? (http://www.cfd-online.com/Forums/fluent/33259-how-define-epsilon-rsm-model.html)

David March 17, 2004 10:39

How to define Epsilon in RSM model?
 
I want to use RSM model to simulate wind tunnel test of buildings. There are some different ways to give epsilon: one is like epsilon=Cu^0.5*k(z)*du/dz(based turbulence equilibrium hypothesis of standard k-epsilon model);

the other is like the style epsilon=Cu^0.75*k^1.5/(Karman Constant*L) or epsilon=Cu^0.75*k^1.5/(Karman Constant*z),

Also fluent suggest give epsilon as epsilon=delta(k)*u/Lx in the case of simulating wind tunnel test.

So,I am not sure how to give epsilon properly and how it effets the results. Any suggestion will be great appreciated.


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