CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Wrong results in OpenFoam parallel runs

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

LinkBack Thread Tools Display Modes
Old   November 8, 2013, 08:39
Exclamation Wrong results in OpenFoam parallel runs
New Member
Visakh M G
Join Date: Dec 2010
Location: Thiruvananthapuram, India
Posts: 4
Rep Power: 8
visakhmg is on a distinguished road
Hello everyone,
I am runing 3D incompressible cases with simpleFoam as well as porousSimpleFoam in OpenFoam 2.1.1. I have noticed that when i start a parallel run from scratch (from time 0), it gives me wrong results and some times the simulation blows off. But when I start the parallel run after a few (say 50) time steps in seriala and switch on to parallel, it gives me reasonable reults. I am using scotch decomposition method and the domain is relatively bulky. Does the error increase with number of processors I am using? I heard there is some problem with parallelization in OpenFoam 2.1.1. Is it true? And finally, what is the diference between scotch and metis decomposition methods?
visakhmg is offline   Reply With Quote

Old   November 9, 2013, 14:13
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,021
Blog Entries: 39
Rep Power: 109
wyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of light
Greetings Visakh,

It doesn't matter as much the version of OpenFOAM you are using, because any version can lead to a crash, if certain details are not taken into account when running in parallel, as listed here: - post #28 provides a list of known reasons why a run might not go well in parallel.

Best regards,
wyldckat is offline   Reply With Quote


error, parallel computing, parallel decomposition, scotch, wrong results

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
udf error srihari FLUENT 1 October 31, 2016 15:18
Running in parallel with a machine that doesn't have OpenFOAM aujamal20 OpenFOAM Running, Solving & CFD 1 September 14, 2013 10:08
OpenFoam Parallel running shipman OpenFOAM Running, Solving & CFD 3 August 17, 2013 10:50
OpenFOAM doesn't run in parallel callumso OpenFOAM Running, Solving & CFD 0 July 11, 2013 12:17
Differences between serial and parallel runs carsten OpenFOAM Bugs 11 September 12, 2008 11:16

All times are GMT -4. The time now is 00:25.