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

relaxation factors

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 25, 2000, 11:02
Default relaxation factors
  #1
Roberto Ciardulli
Guest
 
Posts: n/a
How do relaxation factors affect calculations? If I use values that are lower than default ones, is my solution "less real"?

thank you in advance

Roberto
  Reply With Quote

Old   October 25, 2000, 11:35
Default Re: relaxation factors
  #2
J. Y. Luo
Guest
 
Posts: n/a
The relaxation factors only affect the convergence history, not the final results. The purpose of under-relaxation is to make variable changes less rapidly so that the solution is more stable.
  Reply With Quote

Old   October 26, 2000, 10:40
Default Re: relaxation factors
  #3
Roberto Ciardulli
Guest
 
Posts: n/a
I know that this could seem a stupid question, but wouldn't it be easier just to set a very very low relax. fact. like 0.1? I'm very interested in this topic.

Thanks, Roberto
  Reply With Quote

Old   October 26, 2000, 11:35
Default Re: relaxation factors
  #4
J. Y. Luo
Guest
 
Posts: n/a
Yes, you can do that. It's a balance between stability and computing time. If you set very low under-relaxation factor, the solution changes very little by each iteration and it will takes ages to get convergence. The best values should be as close to one as possible while maintaining solution stability.
  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
Relaxation factors Vidya Raja FLUENT 7 September 26, 2006 20:00
Under relaxation factors for LES Dinesh Main CFD Forum 0 March 26, 2006 06:25
Under relaxation factors box... Help ! Cyril FLUENT 8 October 28, 2005 00:16
Relaxation Factors Tim Phoenics 3 June 30, 2004 02:03
relaxation factors zhujianguo Phoenics 1 August 5, 2003 06:17


All times are GMT -4. The time now is 07:10.