|April 10, 2014, 01:07||
The results difference between parallel and serial run.
Join Date: Jul 2012
Posts: 1Rep Power: 0
I'm working on developing a model of plasma jet flow for plasma cutting. I've attached figures of temperature distribution at the same time. They are the results of parallel and serial run.
As you can see the figures, the unphysical temperature is seen at the interface between subdomains for parallel run. As time goes on the simulation by parallel run blows up. For the results of one processor run(serial run), the temperature distribution looks good.
Scotch method is used for decomposition. I already checked the mesh quality but it is fine. I don't know what causes this problem. Do you have any idea about this problem?
|April 16, 2014, 16:54||
Join Date: Dec 2013
Posts: 14Rep Power: 4
hi, i'm relatively new to OpenFoam and I didn't thought that there are problems in this way. interesting to know.
Did you play around with the hierarchicalCoeffs?
for example (2 2 1) which can be better than (4 1 1)
Maybe there are problems if the borders of the subdomains are on positions with high gradients
|April 17, 2014, 02:26||
Join Date: Aug 2011
Location: Nancy, France
Posts: 1,419Rep Power: 25
I can only guess that in your model you modify certain volume field with = operator and then forget to call correctBoundaryConditions method. Though the real reason can be elsewhere.
|decomposepar, openfoam 2.2.x, parallel computation|
|Thread||Thread Starter||Forum||Replies||Last Post|
|parallel run is slower than serial run (pimpleFoam) !!!||mechy||OpenFOAM||18||August 17, 2016 17:19|
|Big Difference Between serial run and parallel run case||alundilong||OpenFOAM Running, Solving & CFD||3||December 5, 2014 09:27|
|Big Difference Between Serial run and Parallel run case||alundilong||OpenFOAM Programming & Development||1||March 20, 2013 16:52|
|different results between serial solver and parallel solver||wlt_1985||FLUENT||10||April 11, 2012 15:25|
|serial run fine, but parallel run diverged||phsieh2005||OpenFOAM Running, Solving & CFD||2||October 6, 2009 08:33|