CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > STAR-CCM+

Wall Y+ value in the buffer region

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 24, 2016, 19:50
Default Wall Y+ value in the buffer region
  #1
Member
 
Kamal Bisht
Join Date: Jun 2015
Posts: 35
Rep Power: 3
Bisht is on a distinguished road
Hi, I am bit confused about the wall Y+ value requirement for Realizable k-epsilon model. In order to resolve the viscous sublayer, it should be below 1 and for application of wall function it should be above 30.
But what will be the accuracy of the result for y+ value in range of 5-25,i.e buffer region.
From the Star-CCM+ user guide, I got to know about the Two layer all y+ wall treatment which basically switched between high Y+ and low Y+ wall treatment according to Y+ value. But what will happen when y+ value is between 5-25? Can Realizable k-epsilon model resolve it efficiently?
__________________
Regards,

Kamal
Bisht is offline   Reply With Quote

Old   February 26, 2016, 08:35
Default
  #2
Senior Member
 
Andrea
Join Date: Mar 2009
Location: Torino, Italy
Posts: 104
Rep Power: 9
Blanco is on a distinguished road
Short answer :no ;-) none of the rans turbulence models is appropriate in the buffer region, even if sometimes the high re approach could give good results also when y+ is as low as 11-15, but this is very case dependent.
Blanco is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How I can introduce my power heat (W) in chtMultiRegionFoam? aminem OpenFOAM Pre-Processing 28 July 15, 2016 08:57
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Fluent3DMeshToFoam simvun OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 48 May 14, 2012 05:20
UDF for wall slipping HFLUENT Fluent UDF and Scheme Programming 0 April 27, 2011 12:03
Import gmsh msh to Foam adorean Open Source Meshers: Gmsh, Netgen, CGNS, ... 24 April 27, 2005 08:19


All times are GMT -4. The time now is 16:35.