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November 16, 2011, 09:52 |
Problem Setting floatTransfer Parameter
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#1 |
New Member
Geoffrey Bell
Join Date: Feb 2011
Posts: 1
Rep Power: 0 |
Hi,
I have a case in porousSimpleFoam that converges easily when run on a single processor as a serial job. However, when run in parallel using the follwing commands fails to converge: runApplication blockMesh runApplication setSet -batch createCanopy.setSet runApplication setsToZones runApplication decomposePar runParallel redistributeMeshPar 4 -overwrite runParallel renumberMesh 4 -overwrite runParallel porousSimpleFoam 4 runApplication reconstructParMesh -constant runApplication reconstructPar Since my understanding is that failure to converge can result from only single-precision communication between the processors, and that this transfer is controlled using the floatTransfer parameter, and possibly nProcsSimpleSum parameters in controlDict, I have made the following entries in controlDict: floatTransfer 1; nProcsSimpleSum 4; Despite this however, the following is what appears at the top of the log file for porousSimpleFoam. Note that floatTransfer is still 0, and nProcsSimpleSum is also still 0: nProcs : 4 Slaves : 3 ( Pavilion.32246 Pavilion.32247 Pavilion.32248 ) Pstream initialized with: floatTransfer : 0 nProcsSimpleSum : 0 commsType : nonBlocking fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations I would like to be able to change these parameters for trouble-shooting purposes, and I am not sure what I am doing wrong here when trying to change them. I was wondering if anyone might know how I could do this? Thanks, Geoff Bell |
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