Y plus for various turbulence models
Dear all,
I am working on the study of wall treatment for different turbulence models (fluid domain as cyclone separator). This simulation is carrying out flow simulation alone for better understanding. In the above mentioned work, I need to know the effective range of y plus for various turbulence models such as kepsilon, komega, SST and RSM etc. I have searched but I could not get material which gives elaborated details. So, I wish to know the range of y plus has to be used or better if you give me link to come across the same. Thanks in advance. 
SST can handle any y+.
ke should be >11 komega should be <1 RSM should be >11 if using wall functions or anything if automatic. But the final decision on wall mesh resolution should always be determined by a sensitivity study in your case. 
Hi Glenn,
Thank you for valuable details. I will check on each turbulence models and do for sensitivity study. 
Hi,
Does these limits change: 1. If flow is internal or external. 2. Using wall functions Thank you Regards Hamed 
1. No.
2. If you use wall functions then you need y+>11. This is all basic application of the wall boundary condition theory. If you read up about the wall boundary condition and understand it then the reason for these answers become obvious. 
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But the low Re keps models in FLUENT (LaunderSharma, YangShih etc) all use damping functions and redefined values of eps to regularise the extremities in k and eps near wall and hence integration to the wall is possible with Y+ values less than 1 etc. There are w based models both in CFX and FLUENT which are which are generally favoured. 
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