CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Backward facing step

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

LinkBack Thread Tools Search this Thread Display Modes
Old   February 28, 2000, 06:34
Default Backward facing step
Chris De Langhe
Posts: n/a
Is there anyone who had good convergence results for a turbulent calculation of flow over a backward facing step? I'm trying the DNS case of le and Moin (Re=5100), but until now I didn't get satisfying results. I'm especially interested in a solution with the RNG turbulence model.

  Reply With Quote

Old   March 5, 2000, 16:04
Default Re: Backward facing step
Sung-Eun Kim
Posts: n/a
For the Jovic and Driver's backstep problem, you're essentially using the Wolfstein's one-equation turbulence model in the "whole" domain if you're using the two layer model in FLUENT. The reason is that the default boundary of Reynolds number Re_y (the interafce between the two-equation model and the one equation model) is 200, and the Reynolds number for the Jovic and Driver's case is such that Re_y in most of the region is below 200. This problem doesn't occur in the case of Driver and Seegmiller's case, because the Reynolds number for the latter is much higher.

With the one equation model being used in the whole domain, the transport of epsilon is completely neglected, which may be responsible for the mediocre results you're witnessing.

  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Backward facing step. Fluids Main CFD Forum 7 December 4, 2012 11:28
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 18:07

All times are GMT -4. The time now is 08:12.