Parallel run diverges, serial does not

SammyB · May 8, 2009, 11:50

Hi,
I have a case which runs fine in parallel with OpenMpi and serial without turbulence model. Unfortunately, the parallel run with turbulence model on (e.g. kE->LaunderGibsonRSTM) segfaults after few iterations.
Whereas the serial run seems to converge (still running).

Could this be a problem of the used preconditioner (p: GAMG, others: DILU)?
Could someone, please, point me to a possible solution?

Thanks and have a nice weekend.
Samuel

fra76 · May 10, 2009, 04:28

Hi Samuel,
there are a few threads about similar issues. Try to have a look to these two, for example:

http://www.cfd-online.com/Forums/ope...tml#post215615

http://www.cfd-online.com/Forums/ope...llel-runs.html

Hope this helps,
Francesco

May 8, 2009, 11:50	Parallel run diverges, serial does not	#1
SammyB New Member Samuel Braun Join Date: Mar 2009 Posts: 1 Rep Power: 0	Hi, I have a case which runs fine in parallel with OpenMpi and serial without turbulence model. Unfortunately, the parallel run with turbulence model on (e.g. kE->LaunderGibsonRSTM) segfaults after few iterations. Whereas the serial run seems to converge (still running). Could this be a problem of the used preconditioner (p: GAMG, others: DILU)? Could someone, please, point me to a possible solution? Thanks and have a nice weekend. Samuel

May 10, 2009, 04:28		#2
fra76 Senior Member Francesco Del Citto Join Date: Mar 2009 Location: Zürich Area, Switzerland Posts: 237 Rep Power: 18	Hi Samuel, there are a few threads about similar issues. Try to have a look to these two, for example: http://www.cfd-online.com/Forums/ope...tml#post215615 http://www.cfd-online.com/Forums/ope...llel-runs.html Hope this helps, Francesco Luttappy and parthigcar like this.

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