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-   -   Standard K-Epsilon near wall treatment below y+ = 12 (http://www.cfd-online.com/Forums/main/96797-standard-k-epsilon-near-wall-treatment-below-y-12-a.html)

 Shalash February 1, 2012 09:02

Standard K-Epsilon near wall treatment below y+ = 12

Hello,

I am curious to know how the standard k-epsilon model, with standard wall function (log law) treats the area below y+ = 12?

In case I want to model the viscous sublayer for heat transfer studies, what are the proper modifications to be made over the standard k-epsilon model?

 cfd_newbie February 1, 2012 21:48

Why are you keen on using the K-epsilon model ? You can use the SST model where there is no such limitation of Y+<12.

 aerogt3 February 2, 2012 10:42

Quote:
 Originally Posted by cfd_newbie (Post 342367) Why are you keen on using the K-epsilon model ? You can use the SST model where there is no such limitation of Y+<12.
Because, in my experience at least, the SST is of no benefit unless you solve all the way down to the wall (i.e., no wall functions.) If you want to use wall functions to simplify your meshing, I feel K-epsilon is best.

 Shalash February 2, 2012 11:08

Quote:
 Originally Posted by cfd_newbie (Post 342367) Why are you keen on using the K-epsilon model ? You can use the SST model where there is no such limitation of Y+<12.
I am not using a commercial code, I am using an in house code with only a k-epsilon model.

 heidar February 2, 2012 17:43

Quote:
 Originally Posted by Shalash (Post 342254) Hello, I am curious to know how the standard k-epsilon model, with standard wall function (log law) treats the area below y+ = 12? In case I want to model the viscous sublayer for heat transfer studies, what are the proper modifications to be made over the standard k-epsilon model?
why you dont conduct your solution with more densed meshes?

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