CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

Reason of divergence ?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 29, 2000, 00:51
Default Reason of divergence ?
  #1
Brayton
Guest
 
Posts: n/a
Hi,

I am writing a finite volume code. But I met a problem. When using finer grids, the computation becomes divergent! What is the reason ?

Thank in advance.

  Reply With Quote

Old   November 29, 2000, 02:05
Default Re: Reason of divergence ?
  #2
Mukhopadhyay
Guest
 
Posts: n/a
Please refer to the thread 'convergence problem' in this forum posted by 19/20 Nov. Also look for the archive. If there is any specific topic please leave message for discussion.
  Reply With Quote

Old   November 29, 2000, 14:34
Default Re: Reason of divergence ?
  #3
frederic felten
Guest
 
Posts: n/a
hi there,

What kind of grid arrangement are you using? Staggered or Collocated? If you are using a collocated arrangement, well be sure that you're treating correctly the pressure-velocity coupling.You also need to pay special attention to the velocity correction. Check the following article: Morinishi, Lund, Vasilyev and Moin. "Fully Conservative Higher Order Finite Difference Schemes for Incompressible Flow". J. Comp. Phys 143, 90-124, 1998. Can be downloaded at: http://mae.uta.edu/~lund/ Finally be sure that your time step does verify the CFL condition.

I hope this helps,

Sincerely,

Frederic Felten CFD Laboratory, UT Arlington. http://utacfdb.uta.edu/
  Reply With Quote

Old   December 2, 2000, 23:34
Default Re: Reason of divergence ?
  #4
Brayton
Guest
 
Posts: n/a
Thank you all!
  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
UDF divergence of a vector cris FLUENT 3 September 4, 2014 18:06
Divergence problem for species transport model MY FLUENT 3 January 11, 2014 05:46
Quarter Burner mesh with periosic condition SamCanuck FLUENT 2 August 31, 2011 11:34
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 09:52
divergence in MAC Method Maciej Matyka Main CFD Forum 2 December 19, 2000 11:43


All times are GMT -4. The time now is 09:56.