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Wall Y+ value in the buffer region

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Old   February 24, 2016, 19:50
Default Wall Y+ value in the buffer region
Kamal Bisht
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Hi, I am bit confused about the wall Y+ value requirement for Realizable k-epsilon model. In order to resolve the viscous sublayer, it should be below 1 and for application of wall function it should be above 30.
But what will be the accuracy of the result for y+ value in range of 5-25,i.e buffer region.
From the Star-CCM+ user guide, I got to know about the Two layer all y+ wall treatment which basically switched between high Y+ and low Y+ wall treatment according to Y+ value. But what will happen when y+ value is between 5-25? Can Realizable k-epsilon model resolve it efficiently?

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Old   February 26, 2016, 08:35
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Short answer :no ;-) none of the rans turbulence models is appropriate in the buffer region, even if sometimes the high re approach could give good results also when y+ is as low as 11-15, but this is very case dependent.
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