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Y+ Range for RNGk-epsilon Turbulence Method

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Old   December 31, 2008, 05:05
Default Y+ Range for RNGk-epsilon Turbulence Method
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Velan
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Hi all

I simulated fully supersonic flow of scramjet inlet along with cowl using openFOAM. I used RNGk-epsilon Turbulence Method to compute turbulence. My freestream mach number is in the range of 2-3. When i checked the y+ range, it came in the range of 10-600. Near the separation region y+ is very high. I dont know what range of y+ should be for RNGk-epsilon method. Can you please tell me how to calculate y+ ? Does anybody having idea about it ?

- Velan
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Old   January 6, 2009, 11:50
Default Re: Y+ Range for RNGk-epsilon Turbulence Method
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John S.
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K-epsilon models typically need a y+ of around 30 to be accurate as you're not trying to resolve the boundary layer. There's a lot of information about y+ located in the wiki. I find it a little odd, though, that you're reporting high y+ near a separated region inthat y+ is directly related to wall shear. Areas of low wallshear, such as within a separated region, typically have low y+ values.
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