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Gabriella September 25, 2008 12:48

modeling turbulence
 
I want to study the turbulence inside an isothermal reactor. What is the better model I can use? Until now I have used only k-epsilon model.Is it correct this model for such study or is better another model?

John S September 26, 2008 11:59

Re: modeling turbulence
 
Each model has its own advantages and disadvantages so the choice of model is up to the user based on what flow characteristics you want to capture. K-epsilon models are good for modeling the freestream but tend to lose their accuracy in the near wall simulation, whereas k-omega models are the opposite. The SST formulation of the k-w model tries to blend k-w near the wall and k-e near the freestream. It has the disadvantage of over-predicting the onset and reattachment of flow separation, though. There's a great deal of literature available from Fluent on the theory behind the difference turbulence models.


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