"Y plus" very important!!!
Hi!
I need some information about the expected Y plus value for each turbulence model. Please help me!!! 
hello,
Y+ is very effective in the calculation, and the value may be 524 or 24500 for RANS turbulence model. But it can be changeable for your simulation and results 
thank u for your response but i need a detailed information, such as how much acceptable y plus for realizable KE?

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Actually, every boundary layer is divided into three parts: 1sublayer 2buffer layer 3log law layer. All RANS turbulent models estimate viscosity and this viscosity is also included of molecular and/or turbulent ones. The importance of y+ lies in the fact that which part the center point of a mesh situates. Therefore, turbulent model estimates viscosity due to that part. In the buffer layer, we cannot have a good anticipation, as a consequence, it makes a recommend to avoid a y+ value in buffer layer. I enclose a picture to give the points
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my case study is a simplified car body and i want to use RKE or SST KW turbulence models. for more accurate results, how much should be y plus values?!
which one is correct? 30< y+ <300 or y+ <5 ? 
Dear friend
The drag coefficient is depend to y+ value. I suggest to you to consider 30< y+ <300 initially; but if the results was not sufficient precision, then use another y+. It has had an experience that the y+ <5 is achieved more accuracy Quote:

thank you so much!

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