[snappyHexMesh] snappyHexMesh - parallel processing problems

oldirtybrindley · March 4, 2014, 23:55

When I run snappy regularly everything is fine. As soon as I use decomposePar, the resulting mesh is the same as that of blockMesh. Is this a simple fix?

Lieven · March 5, 2014, 04:52

You first need to copy the mesh in the last time directory created by snappy to the constant/polyMesh folder. Or alternatively run snappy with the '-overwrite' option.

Cheers,

L

oldirtybrindley · March 5, 2014, 09:35

after running reconstructPar -latestTime, no new folders are being made? All I have is 8 processor folders and the 0, constant, and systems folder. I feel like a new time folder should be created correct?

Ruli · March 5, 2014, 09:49

Dear B,
if you use -overwrite, no new folders (1,2,3) are created. Instead 0 is overwritten.

Best regards
Julian

oldirtybrindley · March 5, 2014, 09:56

when I run snappy with -overwrite I cannot get recontructPar to work?

oldirtybrindley · March 5, 2014, 10:21

blockMesh
decontructPar -force
foamJob -parallel -screen snappyHexMesh -overwrite
reconstructPar -zeroTime ---> gives error: Size of maps does not correspont to size of mesh for processor 0
reconstructPar -latestTime ---> gives error: No times selected

when I run without overwrite, two new times folders are created within each processor (one for mesh, one for snap), but reconstructPar does not create new times folders in the directory.

when I run with overwrite, no new times folders are created within each processor, and I cannot use reconstructPar.

again, if I just use snappyHexMesh, everything works out perfectly. Could this have to do with the way decomposePar is splitting up the mesh? the piece I am adding is not evenly distributed.

Ruli · March 5, 2014, 10:38

Try

Code:

reconstructParMesh -noZero -constant -mergeTol 1e-6

This works for me with snappy in parallel.

Best regards
Julian

oldirtybrindley · March 5, 2014, 10:57

RULI you're the best! Worked like a charm.

March 4, 2014, 23:55	snappyHexMesh - parallel processing problems	#1
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	When I run snappy regularly everything is fine. As soon as I use decomposePar, the resulting mesh is the same as that of blockMesh. Is this a simple fix?

March 5, 2014, 09:49		#4
Ruli Member Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 14	Dear B, if you use -overwrite, no new folders (1,2,3) are created. Instead 0 is overwritten. Best regards Julian __________________ πάντα ῥεῖ - Heraclitus

March 5, 2014, 10:38		#7
Ruli Member Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 14	Try Code: reconstructParMesh -noZero -constant -mergeTol 1e-6 This works for me with snappy in parallel. Best regards Julian amcloughlin801 and B_R_Khan like this. __________________ πάντα ῥεῖ - Heraclitus

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March 5, 2014, 04:52		#2
Lieven Senior Member Lieven Join Date: Dec 2011 Location: Leuven, Belgium Posts: 299 Rep Power: 22	You first need to copy the mesh in the last time directory created by snappy to the constant/polyMesh folder. Or alternatively run snappy with the '-overwrite' option. Cheers, L

March 5, 2014, 09:35		#3
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	after running reconstructPar -latestTime, no new folders are being made? All I have is 8 processor folders and the 0, constant, and systems folder. I feel like a new time folder should be created correct?

March 5, 2014, 09:56		#5
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	when I run snappy with -overwrite I cannot get recontructPar to work?

March 5, 2014, 10:21		#6
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	blockMesh decontructPar -force foamJob -parallel -screen snappyHexMesh -overwrite reconstructPar -zeroTime ---> gives error: Size of maps does not correspont to size of mesh for processor 0 reconstructPar -latestTime ---> gives error: No times selected when I run without overwrite, two new times folders are created within each processor (one for mesh, one for snap), but reconstructPar does not create new times folders in the directory. when I run with overwrite, no new times folders are created within each processor, and I cannot use reconstructPar. again, if I just use snappyHexMesh, everything works out perfectly. Could this have to do with the way decomposePar is splitting up the mesh? the piece I am adding is not evenly distributed.

March 5, 2014, 10:57		#8
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	RULI you're the best! Worked like a charm.