Problem with endTime by running OpenFOAM in parallel

Zigec · July 19, 2017, 09:34

Hey,

I have a simple simulation with a cylindrical geometry, for which I created the mesh in ICEM CFD. The top wall has a rotational movement and I am using simpleFoam, for this laminar flow of mine.

Because the mesh has around 1,4M cells (all hexa) I am running parallel. I run the decomposePar - everything fine, than I run the mpirun. It is not important if I run on 2 or 3 cores, the result is the same:

The run stops always after 6.784 s. It finishes normally, without any errors etc. I can run reconstructPar and postProcess everything normally, but still I need a longer simulation for my case.

Aldo, I have in the controlDict specified the endTime: 50. Or 20 or 100. It is always the same.

I was searching the forums and everything, but I didn't find a similar case. Has anyone dealt with this before?

Ziga

rcastilla · July 19, 2017, 12:39

Hi, Ziga,
Probably it has stopped because it has reached the convergence criteria. Check the message at the end of the simulation log. Also check the system/fvSolution file for the convergence criteria.
I hope it will help.
Best regards
Robert

Zigec · July 19, 2017, 13:21

aai... thanks, totally forgot that simpleFoam is a steadystate solver. That explains it all.

Sorry for bothering. I recently started with openFoam. Need to be more careful in the future.

July 19, 2017, 09:34	Problem with endTime by running OpenFOAM in parallel	#1
Zigec New Member Ziga Join Date: Feb 2016 Location: Maribor, Slovenia Posts: 27 Rep Power: 10	Hey, I have a simple simulation with a cylindrical geometry, for which I created the mesh in ICEM CFD. The top wall has a rotational movement and I am using simpleFoam, for this laminar flow of mine. Because the mesh has around 1,4M cells (all hexa) I am running parallel. I run the decomposePar - everything fine, than I run the mpirun. It is not important if I run on 2 or 3 cores, the result is the same: The run stops always after 6.784 s. It finishes normally, without any errors etc. I can run reconstructPar and postProcess everything normally, but still I need a longer simulation for my case. Aldo, I have in the controlDict specified the endTime: 50. Or 20 or 100. It is always the same. I was searching the forums and everything, but I didn't find a similar case. Has anyone dealt with this before? Ziga

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July 19, 2017, 12:39		#2
rcastilla Senior Member Robert Castilla Join Date: Apr 2009 Location: Spain Posts: 109 Rep Power: 17	Hi, Ziga, Probably it has stopped because it has reached the convergence criteria. Check the message at the end of the simulation log. Also check the system/fvSolution file for the convergence criteria. I hope it will help. Best regards Robert

July 19, 2017, 13:21		#3
Zigec New Member Ziga Join Date: Feb 2016 Location: Maribor, Slovenia Posts: 27 Rep Power: 10	aai... thanks, totally forgot that simpleFoam is a steadystate solver. That explains it all. Sorry for bothering. I recently started with openFoam. Need to be more careful in the future.