# Wall threatment

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 January 13, 2011, 08:56 Wall threatment #1 New Member   Join Date: Jan 2011 Posts: 3 Rep Power: 9 Hello, I am modelling a windtunnel in order to receive a drag coefficient for a vehicle. The vehicle I use has a Reynolds number of 4,29 million. I am using the k-omega turbulence model. How do I know, if my y+ values have to be smaller than 1 oder bigger than 30? I am using SC-Tetra and the results of the calculations give me the following range of values for y+: (YPLUS DISTRIBUTION) 0.0 - 1.0 : 31 1.0 - 2.0 : 45 2.0 - 5.0 : 279 5.0 - 11.6 : 813 11.6 - 1000.0 : 17863 1000.0 - Inf : 0 I used 5 prism layer with a growing rate of 1.3. The first prism layer has a size of 1E-3 m. Can somebody tell me how to get the wall distance and which range to use? Thank you. Best regards webceo89

 January 14, 2011, 00:47 #2 Senior Member   mohammad Join Date: Dec 2010 Location: Seoul, South korea Posts: 215 Rep Power: 10 [QUOTE=webceo89;290276]Hello, I am modelling a windtunnel in order to receive a drag coefficient for a vehicle. The vehicle I use has a Reynolds number of 4,29 million. I am using the k-omega turbulence model. How do I know, if my y+ values have to be smaller than 1 oder bigger than 30? I am using SC-Tetra and the results of the calculations give me the following range of values for y+: (YPLUS DISTRIBUTION) 0.0 - 1.0 : 31 1.0 - 2.0 : 45 2.0 - 5.0 : 279 5.0 - 11.6 : 813 11.6 - 1000.0 : 17863 1000.0 - Inf : 0 I used 5 prism layer with a growing rate of 1.3. The first prism layer has a size of 1E-3 m. Can somebody tell me how to get the wall distance and which range to use? ----------------------------------------------------------------------- Hi Webceo89 I had some problem with Y+. I don't know about SC-Tetra, but some thing i came into was that you must pay attention to the values of Yplus. they have a big influence on your run and even on your results. plus read the following post http://www.cfd-online.com/Forums/mai...e-y-yplus.html it will help you.

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