CFD Online URL
[Sponsors]
Home > Forums > OpenFOAM Pre-Processing

Wall functions

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 2, 2007, 06:04
Default Hey all, for a turbulence s
  #1
tutlhino
Guest
 
Posts: n/a
Hey all,

for a turbulence simulation using the k-epsilon model I also have to consider wall functions. Comparing the pitzDaily example with simulations of cfx a strange difference at the upper wall (where the wall distance is reducing again) appeared. In the simulation with openFoam the the velocity near the wall was about 50% of the inflow, in contrast to cfx where the velocity was almost zero in that area.

One point I recognized is that the steady state solutions of cfx and of differ and cfx seems to stop much earlier. But after all I think the difference at the upper wall is also due to the wall functions. I've read that OF uses the nu_T wall function, in contrast to cfx which uses scalable wall functions. First, is there a big difference between both and second can I find more information about the wall functions used in OF? Is there a way to use almost the same wall functions?


Cheers
Florian
  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
wall functions near slanting wall Pankaj Main CFD Forum 0 September 11, 2008 10:50
LES with wall functions, wall boundary, Re 10000 subba CFX 4 July 10, 2007 06:04
Wall Functions adam OpenFOAM Running, Solving & CFD 2 August 31, 2006 10:18
damping functions(wall functions) Pr Main CFD Forum 0 March 22, 2004 03:17
abt near wall turbulence wall functions amv Main CFD Forum 0 May 12, 2003 04:38


All times are GMT -4. The time now is 21:40.