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March 13, 2018, 05:37 |
lowReynold mesh and RNGkEpsilon
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#1 |
New Member
Thijs
Join Date: Nov 2017
Posts: 29
Rep Power: 8 |
Dear Foamers,
I have a question about near wall modelling using either RNGkEpsilon or realizableKE. I created a lowReynold mesh of a pipe with a helix structure inside (imagine a ribbed pipe) with a y+~= 1 near the pipe wall. I tested LaunderSharmaKE which is a lowRe turbulence model. The way I understand it, this model has damping functions build inside it, such that the wall boundary conditions can be set to: k at wall = fixedValue (0) epsilon at wall = zeroGradient. But I want to try a different kEpsilon model such as realizableKE and RNGkEpsilon and still use a lowReynold mesh, because my mesh quality becomes bad if I use a y+~= 30 spacing near the wall such that I can use standard wall functions. I read about enhanced wall treatment, but I think this is a term used in FLUENT. Anyway I think RNGkEpsilon and realizableKE can be used for a lowReynold mesh but I have to activate damping functions. If I use lowRe wallfunctions am I than applying dampingfunctions to my turbulence model? I am not sure? Bc's at the wall, would look like this: k @ wall = kLowReWallFunction epsilon @ wall = epsilonWallFunction nut @ wall = nutLowReWallFunction Thanks in advance, Thijs |
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