CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Phoenics

Convergence criteria

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

LinkBack Thread Tools Search this Thread Display Modes
Old   October 29, 2005, 18:11
Default Convergence criteria
Posts: n/a
I am using Flair 3.6 to simulate the wind flow through a perforated wall with several cavities in a simplified model. The domain size is 2.15 m(x), 3 m (y), 0.9 m(z) and the cells sizes vary from 1 cm at the cavities entrances to 4 cm at the domain extremities.

I am not achieving the properly convergence of the case. I have used positive values for the velocities and negative ones for the rest of the variables, without automatic convergence control, but the solution diverges and the error is big.

Are there any convergence criteria that I could use in that case?


  Reply With Quote

Old   December 6, 2005, 07:25
Default Re: Convergence criteria
Posts: n/a
Set the inertial relaxation on the velocities to (small cell size in main flow direction/(no of cells in main flow direction*wind speed). Use linear relaxation of 0.3 on the turbulence variables. It is best to model the perforated wall in terms of the superficial velocity.
  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
convergence criteria Panagiotis Kotsidas FLUENT 1 March 24, 2007 07:25
convergence criteria pavan Siemens 1 January 10, 2005 06:07
convergence criteria co2 FLUENT 5 May 20, 2004 09:52
Convergence criteria srinath Main CFD Forum 0 May 12, 2003 04:19
convergence criteria student Main CFD Forum 6 October 15, 2002 01:44

All times are GMT -4. The time now is 13:19.