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#1 |
New Member
Join Date: Mar 2018
Posts: 2
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Hello there,
I modeled a pump on CFX (and FLUENT) with the SST K-omega model. This model combines the k-epsilon formulation for the free Stream and the k-omega formulation in the boundary layer. To use k-omega formulation, "the first computational cell must have its centroid in y+ ~1". That means a fine mesh allows the resolution of the boundary layer. And if the y+ is in the log-layer (30-200), wall functions are used. But what is happening if we use Automatic wall treatment? And if the y+ is between 1-30 (in the Buffer layer)? Thank you all in advance |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,797
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There is a blending function that blends the log-layer formula to linear-layer one. When you are in the buffer layer, the same blended formula is used so nothing changes.
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