[snappyHexMesh] snappyHexMesh - parallel processing problems

oldirtybrindley · March 5, 2014, 00:55

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, 05:52

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, 10:35

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, 10:49

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, 10:56

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

oldirtybrindley · March 5, 2014, 11:21

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, 11:38

Try

Code:

reconstructParMesh -noZero -constant -mergeTol 1e-6

This works for me with snappy in parallel.

Best regards
Julian

oldirtybrindley · March 5, 2014, 11:57

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

March 5, 2014, 00:55	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, 10:49		#4
Ruli Member Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 15	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, 11:38		#7
Ruli Member Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 15	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[snappyHexMesh] Parallel processing SnappyHexMesh	mullet904	OpenFOAM Meshing & Mesh Conversion	6	September 25, 2016 14:30
Explicitly filtered LES	saeedi	Main CFD Forum	16	October 14, 2015 12:58
multiphase solver - parallel processing - GAMG	thibault_pringuey	OpenFOAM Programming & Development	2	August 27, 2013 23:03
OF Parallel Processing with Core i7 - How to Handle Hyperthreading	dancfd	OpenFOAM Running, Solving & CFD	5	March 5, 2012 22:43
Cyclic patches and parallel postprocessing problems	askjak	OpenFOAM Bugs	18	October 27, 2010 04:35

March 5, 2014, 05:52		#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, 10:35		#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, 10:56		#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, 11:21		#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, 11:57		#8
oldirtybrindley New Member J. Brindley Join Date: Mar 2014 Posts: 11 Rep Power: 12	RULI you're the best! Worked like a charm.