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

 Register Blogs Members List Search Today's Posts Mark Forums Read

 February 1, 2012, 09:02 Standard K-Epsilon near wall treatment below y+ = 12 #1 New Member   Karim Shalash Join Date: Feb 2012 Location: Switzerland Posts: 7 Rep Power: 6 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?

 February 1, 2012, 21:48 #2 Senior Member   Raashid Baig Join Date: Mar 2010 Location: Bangalore, India Posts: 136 Rep Power: 8 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.

February 2, 2012, 10:42
#3
Member

Join Date: Mar 2009
Posts: 75
Rep Power: 9
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.

February 2, 2012, 11:08
#4
New Member

Karim Shalash
Join Date: Feb 2012
Location: Switzerland
Posts: 7
Rep Power: 6
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.

February 2, 2012, 17:43
#5
Member

Join Date: Mar 2010
Location: Iran- Tehran
Posts: 43
Rep Power: 8
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?
__________________
Best Regards

 Tags heat transfer, near wall treatment, standard k epsilon, y plus

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Chander CFX 12 March 21, 2015 10:34 HFLUENT Fluent UDF and Scheme Programming 0 April 27, 2011 12:03 mmmiichaalll FLUENT 4 March 30, 2010 05:10 Valerio FLUENT 0 April 26, 2008 07:12 C. ORTEGA FLUENT 0 July 7, 2003 08:35

All times are GMT -4. The time now is 06:34.