cfx-solver local parallel causes linear solver error

m4D · May 31, 2013, 02:50

Hi!

I'm modelling a turbomachine passage (includes rotor and stator) in cfx. The mesh is generated in turbogrid, and it's ok/OK there. The problem is set up in cfx-pre with the use of Turbo-mode and pretty standard. When i solve the problem using serial mode, it runs ok and converges. When i set up local parallel, it fails on the 1st iteration with finmes linear solver error. What's the problem? Does the partitioner messses smth up?

ghorrocks · May 31, 2013, 06:14

It is rare for a simulation which runs serial to fail parallel. But you seem to have found one. Sometimes you can make it run by defining a different partitioning algorithm and making sure partition boundaries do not lie on critical parts of the flow like free surfaces or shock waves.

May 31, 2013, 02:50	cfx-solver local parallel causes linear solver error	#1
m4D New Member Join Date: Sep 2012 Posts: 8 Rep Power: 13	Hi! I'm modelling a turbomachine passage (includes rotor and stator) in cfx. The mesh is generated in turbogrid, and it's ok/OK there. The problem is set up in cfx-pre with the use of Turbo-mode and pretty standard. When i solve the problem using serial mode, it runs ok and converges. When i set up local parallel, it fails on the 1st iteration with finmes linear solver error. What's the problem? Does the partitioner messses smth up?

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May 31, 2013, 06:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,699 Rep Power: 143	It is rare for a simulation which runs serial to fail parallel. But you seem to have found one. Sometimes you can make it run by defining a different partitioning algorithm and making sure partition boundaries do not lie on critical parts of the flow like free surfaces or shock waves.