Issues with running simulations after recomposing and decomposing

bobcieri · January 5, 2020, 18:51

I am having an issue where if I run a simulation using pimpleDyMFoam on 96 processors for a few time steps, then recompose the case time steps, and then decompose to a different number of processors (say 32), the simulation immediately blows up (Courant numbers go very high!). Does anyone have a suggestion about how to recompose and decompose without this error? I am attempting to use computational resources on campus as they become available.

Thanks,

Bob

geth03 · June 3, 2020, 09:32

which method do you use for decomposing?

January 5, 2020, 18:51	Issues with running simulations after recomposing and decomposing	#1
bobcieri New Member Bob Cieri Join Date: Jan 2020 Posts: 1 Rep Power: 0	I am having an issue where if I run a simulation using pimpleDyMFoam on 96 processors for a few time steps, then recompose the case time steps, and then decompose to a different number of processors (say 32), the simulation immediately blows up (Courant numbers go very high!). Does anyone have a suggestion about how to recompose and decompose without this error? I am attempting to use computational resources on campus as they become available. Thanks, Bob

June 3, 2020, 09:32		#2
geth03 Senior Member Join Date: Dec 2019 Location: Cologne, Germany Posts: 355 Rep Power: 8	which method do you use for decomposing?