Fluids

Fluids

Difference between K-epsilon and K-omega Turbulence Model

    • Burhan
      Subscriber

      I am doing simulation of "Vortex Tube" in which compressed air swirl through out the body. 


      1-Which Model can I use (k-e or k-w) ? I want to converge result fast. Suggest me briefly please.


    • raul.raghav
      Subscriber

      Based on the quick literature review, it seems that the Standard k-e model predicts the flow better than the other turbulence models. But you might also want to look into the k-w SST model with curvature correction. Look into the following articles for more information:


      Comparison of different turbulence models in predicting the temperature separation in a Ranque–Hilsch vortex tube


      CFD analysis of energy separation of vortex tube employing different gases, turbulence models and discretisation schemes

    • Raef.Kobeissi
      Subscriber
      k- epsilon model poorly resolves the viscous layer unline K-Omega model. Furthermore,  k-ω model is good in resolving internal flows, separated flows and jets and flows with high-pressure gradient and also internal flows through curved geometries. You always need to make sure that you have a proper mesh at the boundary wall by abiding by the correct Y Plus value.
       
       
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