CFD Online Logo CFD Online URL
Home > Forums > CFX

boundary layer

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

LinkBack Thread Tools Display Modes
Old   June 27, 2003, 07:21
Default boundary layer
Posts: n/a
hello user, i want to know that how we can capture the boundarly layer in CFX5.5 and we should use the wall function or not and for boundary layer capturing whcih tubulence model should be used for incompressible flow. Thanks in advance
  Reply With Quote

Old   June 30, 2003, 10:27
Default Re: boundary layer
Posts: n/a
You got to create an inflated mesh that adequately resolves the boundary layer, which means you'll have to have an idea of the BL thickness. Go search for "modelling flow near the wall" in the manual for the details. I got good results with y+ of the first node point close to 11, but some people suggest going as low as 2.

Wall functions depend on the turbulence model you're going to use, k-e based models use them, k-w based not. Turbulence model depend on your application, but for general incompressible flow in favourable pressure gradient normal k-e should be fine. Use scalable wall function in konjunction with k-e, unless you know the standard ones give better results. You can also use the SST model and compare the results.
  Reply With Quote


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
Default Faces on Boundary Layer axel Open Source Meshers: Gmsh, Netgen, CGNS, ... 8 February 17, 2011 08:47
Boundary Layer Question scottneh STAR-CCM+ 3 September 30, 2010 14:21
Adapt mesh without modifying boundary layer cells? Freeman FLUENT 0 February 22, 2009 15:11
3D Boundary Layer Mario FLUENT 0 February 17, 2009 04:40
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 00:57.