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Fluids

Recommended y+ values for k-? model with Menter-Lechner wall treatment

    • LukeM
      Subscriber

      I am using the RNG k-ε model with Menter-Lechner wall treatment, and I want to ensure I adequately handle the near-wall region. Is there a recommended range of y+ values for the Menter-Lechner wall treatment? I understand the model was specifically designed to be y+ insensitive (see the "Menter-Lechner ε-Equation (ML-&epsilon" article in the user manual), but I want to avoid any less-accurate predictions for flow from the model. For example, should I avoid the 5

       


      Luke

    • Rob
      Ansys Employee

      It depends.  What are you trying to model?  

    • LukeM
      Subscriber

      At the moment, I'm modeling turbulent, single-phase pipe flow. But I will eventually be modeling turbulent, stratified flow through fairly complex geometry. I am also solving some UDS equations. I suspect that accurate predictions of the boundary layer are crucial for my system.

    • Rob
      Ansys Employee

      Adding multiphase will make it much more interesting! 


      General theory is if you want accurate drag etc y+ = 1.   

    • LukeM
      Subscriber

      Wonderful. Thank you! 

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