Wall Functions & Turbulence Models Query [y plus ranges]
Hi I'm trying to understand the wall functions and turbulence models and the requirements to satisfy each mathematical model via the mesh.
Please correct me if I'm wrong below.
TheMightySpartan |
Standard wall functions can certainly be used in the y+<10 range. Standard wall functions have a low reynolds number treatment. What's special about enhanced wall functions, is the enhanced part.
Omega models are designed for low y+, but they can tolerate (they use wall functions) for high y+ meshes. Note that k-w SST model is a blended k-e and k-w model that tolerates high and low y+ meshes. y+ < 10 or y+ < 1 is a matter of a lot of personal preference and experience. The point is to be low. The demarcation between viscous sublayer <5 versus linear region <10 only confounds the issue even more. If it matters to you, then do a grid sensitivity study. What's more important than the wall y+ is the total # of grid points you have across the boundary layer and this is not captured by simply plotting y+. |
So I should forget about y+ and do mesh sensitivity study?
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You should always do a mesh sensitivity study. Especially if you ever plan on publishing anything.
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I understand you are talking about the greater mesh region but there must be some kind of rule book regarding wall functions/turbulence model and y+ right?
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