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

time step and inner iteration loop

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 5, 2007, 17:51
Default time step and inner iteration loop
  #1
sagar gadkari
Guest
 
Posts: n/a
Hello all, Actually I am new to CFD. am using CFDesign to do a transient analysis for heating and cooling of a surface by forced convection using water. I tried using 10 iteration loops and it always gives divergence. I once tried with 2 iterations and it was kindoff stable. Can anyone tell or refer me to some nice explanatin of this. I want to know if it matters and why and how?

thank you

  Reply With Quote

Old   December 5, 2007, 18:01
Default Re: time step and inner iteration loop
  #2
pankaj saha
Guest
 
Posts: n/a
use smaller time step
  Reply With Quote

Old   December 5, 2007, 18:14
Default Re: time step and inner iteration loop
  #3
Hatef
Guest
 
Posts: n/a
well you have not defined your case very clearly . you have not even mentioned that you are running in unsteady mode by the way, things that you have to consider in unsteady mode calculations are: 1.physical time step. which depends on many aspects. 2. inner iteration 3. and the number of outer iteration in your case that you are getting divergence with 10 outer iteration I guess your number of inner iteration is not enough, each inner iteration should converge at first. the other thing maybe your physical time step. decrease it...
  Reply With Quote

Reply

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



All times are GMT -4. The time now is 06:53.