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

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Old   February 1, 2012, 09:02
Default Standard K-Epsilon near wall treatment below y+ = 12
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Karim Shalash
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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?
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Old   February 1, 2012, 21:48
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Raashid Baig
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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.
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Old   February 2, 2012, 10:42
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Quote:
Originally Posted by cfd_newbie View Post
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.
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Old   February 2, 2012, 11:08
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Originally Posted by cfd_newbie View Post
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.
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Old   February 2, 2012, 17:43
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Quote:
Originally Posted by Shalash View Post
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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