||September 26, 2008 10:59
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.