Wrong results in OpenFoam parallel runs
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?
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: http://www.cfd-online.com/Forums/ope...tml#post324934 - post #28 provides a list of known reasons why a run might not go well in parallel.
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