CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

results with parallel processing

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

LinkBack Thread Tools Display Modes
Old   December 29, 2005, 00:07
Default results with parallel processing
Muhammad Shakaib
Posts: n/a
I am solving an unsteady problem using linux cluster at six nodes. For comparison I started the solution (first few iterations)using the cluster and then started the solution using single computer. There was some difference in the printed residual values. Is this usual or something wrong has happened. I am using fluent 6.2.16.


  Reply With Quote

Old   December 29, 2005, 01:56
Default Re: results with parallel processing
Hubert Janocha
Posts: n/a
It is possible that the residuals vary a little bit. When using domain decomposition you will introduce (in some way) an other iterative process, because the boundaries on the domain borders are only virtually, and are not fix. They will be updated e.g. each Iteration. So you have a weak disatvantage in convergence rate/behauviour in parallel mode. But this disatvantage is very small, it depends strongly on the solver settings, and implementation for parallel mode.

Because of this I would be suprised when you get the same residuals.
  Reply With Quote


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
Parallel processing of OpenFOAM cases on multicore processor??? g.akbari OpenFOAM Running, Solving & CFD 31 November 1, 2017 10:25
Parallel Processing Set Up virgilhowardson FLUENT 1 May 11, 2009 00:54
parallel processing in numeca sheeev koomaar NUMECA 1 August 18, 2006 02:35
Paradox in parallel processing Vagelis FLUENT 0 October 26, 2005 05:36
parallel processing Nurul Murad FLUENT 2 July 25, 2001 03:11

All times are GMT -4. The time now is 11:01.