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

  • Last Post 02 August 2019
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LukeM posted this 02 August 2019

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<y+<30 buffer layer? Would I see better predictions above or below that region? 



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rwoolhou posted this 02 August 2019

Adding multiphase will make it much more interesting! 

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

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rwoolhou posted this 02 August 2019

It depends.  What are you trying to model?  

LukeM posted this 02 August 2019

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.

LukeM posted this 02 August 2019

Wonderful. Thank you!