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

Parallel run in fluent for multiphase flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 2, 2011, 22:12
Default Parallel run in fluent for multiphase flow
  #1
New Member
 
Apurv
Join Date: May 2011
Posts: 9
Rep Power: 6
apurv is on a distinguished road
Hi all,

I am trying to run a multiphase flow (solid-fluid Eulerian model) case on a cluster with 4 processors. I have noticed that the solids momentum and energy equations are not solved since the residuals are all zeros. And the run diverges prematurely as compared to serial run of the same case. I am not able to figure out why Fluent is not solving the solid's equations in parallel run. Any help is highly appreciated.

Regards,

Apurv
apurv is offline   Reply With Quote

Old   August 3, 2011, 07:48
Default
  #2
New Member
 
zino
Join Date: Mar 2010
Posts: 23
Rep Power: 7
zino is on a distinguished road
I want to ask you one thing. how you are modeling solid-fluid model. I did it takes too much time to converge solution. have your solution converged for single process?
zino is offline   Reply With Quote

Old   August 3, 2011, 19:44
Default
  #3
New Member
 
Apurv
Join Date: May 2011
Posts: 9
Rep Power: 6
apurv is on a distinguished road
Hi Zino,

Converged solution depends on lot of factors. The under-relaxation factors have to be just right along with the correct upwindings. I had to play around a lot to fix the urel factors and have used mostly 2nd order discretizations. I am modelling a fluidised bed and so the solid friction model and the packing limit had to be adjusted to get a consistent converged solution for unsteady flow.

Key is to have patience and keep trying. It helps to have experimental results at hand to compare the results.

I hope this helps.

Apurv
apurv is offline   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
First Parallel Run - need some help Gian Maria OpenFOAM 3 June 17, 2011 12:08
FLUENT in Windows Serial and Linux Parallel sham83 FLUENT 0 May 31, 2011 23:38
Fluent Parallel SUPPORT MOHAMMED TOLBA FLUENT 1 February 20, 2006 02:27
Parallel Fluent on Linux clusters Chengwang Lei FLUENT 3 November 24, 2004 03:05
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31


All times are GMT -4. The time now is 17:29.