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

Shalash · February 1, 2012, 08:02

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, 20:48

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, 09:42

Quote:

Originally Posted by cfd_newbie

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, 10:08

Quote:

Originally Posted by cfd_newbie

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, 16:43

Quote:

Originally Posted by Shalash

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?

February 1, 2012, 08:02	Standard K-Epsilon near wall treatment below y+ = 12	#1
Shalash New Member Karim Shalash Join Date: Feb 2012 Location: Switzerland Posts: 7 Rep Power: 14	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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February 1, 2012, 20:48		#2
cfd_newbie Senior Member Raashid Baig Join Date: Mar 2010 Location: Bangalore, India Posts: 135 Rep Power: 16	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.