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

Convergence problems

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 29, 2005, 03:07
Default Convergence problems
  #1
Simone
Guest
 
Posts: n/a
I'm currently experiencing some problems in reaching the convergence in STAR-CD calculations. I have already tryed to reduce the mesh size and/or to change the boundary conditions to help reducing the residual values, but after some iterations, they always start obscillating between 10^-1 and 10^-2.

Is there any trick I can use to solve this problem?

Thanks a lot.

Simone
  Reply With Quote

Old   June 29, 2005, 06:50
Default Re: Convergence problems
  #2
4xF
Guest
 
Posts: n/a
Is your problem really steady-state?
  Reply With Quote

Old   June 29, 2005, 07:27
Default Re: Convergence problems
  #3
Simone
Guest
 
Posts: n/a
Yes! It is a really steady-state problem!

Can you help me, please?

Simone
  Reply With Quote

Old   June 29, 2005, 09:10
Default Re: Convergence problems
  #4
4xF
Guest
 
Posts: n/a
To me it looks like your problem may be a REAL transient and you try to enforce a steady-state solution. That may be the reason why you cannot get a converged solution, because the flow physics may be wrong.
  Reply With Quote

Old   June 29, 2005, 10:03
Default Re: Convergence problems
  #5
Simone
Guest
 
Posts: n/a
It's possible! How can I have a transient solution?
  Reply With Quote

Old   June 29, 2005, 10:48
Default Re: Convergence problems
  #6
4xF
Guest
 
Posts: n/a
Change the analysis type from steady-state to transient?
  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
convergence problems using SBF=1 Fonzie CFX 1 March 23, 2007 09:46
Convergence Problems Carlos FLUENT 0 March 12, 2007 03:44
Problems with Convergence Andres Bernal Ortiz CFX 2 January 16, 2007 08:58
Problems in convergence Simon CD-adapco 3 February 14, 2005 06:36
Convergence problems Chetan FLUENT 3 April 15, 2004 19:13


All times are GMT -4. The time now is 01:41.