decomposePar with scotch exits with : ERROR: graphCheck: duplicate arc

ancsa · July 8, 2011, 08:56

I tried to look for similar error messages but found none.

My mesh is a polyhedra mesh originally created as tetra in Icem and then converted to polyhedra with Fluent, then converted to OpenFOAM with fluent3DMeshToFoam. The geometry is a city with house blocks. The simulation runs ok without decomposition, chechMesh also ends with Mesh OK. Decomposition with the single method also works fine.

When using scotch, I get this and nothing happens:

Calculating distribution of cells
Selecting decompositionMethod scotch
: ERROR: graphCheck: duplicate arc

When decomposing the original tetra mesh, scotch works fine, even though there checkMash fails because of unused points.

Hay anyone experienced something like this or has any idea how to look for the duplicate arc if that is not a problem in the tetra mesh only in polyhedra?

Thanks
Aniko

slowtype · July 8, 2011, 14:54

I had a similar problem earlier this week and am interested in any answers.

In the mean time try one of the other decompose methods in the decomposepardict such as metis.

wyldckat · July 9, 2011, 06:06

Greetings to both!

This has been reported as a bug yesterday: http://www.openfoam.com/mantisbt/view.php?id=241
So complement that bug report with a bit more information if you have some to share! And keep a close eye for that bug report, since it should get repaired as soon as the people at OpenCFD can!

Best regards,
Bruno

ancsa · July 11, 2011, 05:02

Hi Andrew and Bruno,

thanks for the the comments, I added a note in the bug report.

Best regards
Aniko

July 8, 2011, 08:56	decomposePar with scotch exits with : ERROR: graphCheck: duplicate arc	#1
ancsa Member Aniko Rakai Join Date: Oct 2009 Location: Geneva Posts: 30 Rep Power: 16	I tried to look for similar error messages but found none. My mesh is a polyhedra mesh originally created as tetra in Icem and then converted to polyhedra with Fluent, then converted to OpenFOAM with fluent3DMeshToFoam. The geometry is a city with house blocks. The simulation runs ok without decomposition, chechMesh also ends with Mesh OK. Decomposition with the single method also works fine. When using scotch, I get this and nothing happens: Calculating distribution of cells Selecting decompositionMethod scotch : ERROR: graphCheck: duplicate arc When decomposing the original tetra mesh, scotch works fine, even though there checkMash fails because of unused points. Hay anyone experienced something like this or has any idea how to look for the duplicate arc if that is not a problem in the tetra mesh only in polyhedra? Thanks Aniko

July 9, 2011, 06:06		#3
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,974 Blog Entries: 45 Rep Power: 128	Greetings to both! This has been reported as a bug yesterday: http://www.openfoam.com/mantisbt/view.php?id=241 So complement that bug report with a bit more information if you have some to share! And keep a close eye for that bug report, since it should get repaired as soon as the people at OpenCFD can! Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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July 8, 2011, 14:54		#2
slowtype New Member Andrew Join Date: Nov 2010 Posts: 12 Rep Power: 15	I had a similar problem earlier this week and am interested in any answers. In the mean time try one of the other decompose methods in the decomposepardict such as metis.

July 11, 2011, 05:02		#4
ancsa Member Aniko Rakai Join Date: Oct 2009 Location: Geneva Posts: 30 Rep Power: 16	Hi Andrew and Bruno, thanks for the the comments, I added a note in the bug report. Best regards Aniko