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scotch error on motorbike on 16p

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Old   December 24, 2012, 21:53
Default scotch error on motorbike on 16p
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Dan Kokron
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I received the following error from scotch-5.1.11 when running snappyHexMesh using 16 processors on the incompressible/pisoFoam/les/motorBike tutorial. The 8p case ran fine out-of-the-box.

"dgraphFoldComm: internal error (3)"

This error emanates from line 307 of ThirdParty-2.1.x/scotch_5.1.11/src/libscotch/dgraph_fold_comm.c

I reviewed the code from newer versions of scotch and found significant changes between 5.1.11 and 5.1.12 for this same file. I installed scotch-5.1.12b and sure enough, snappyHexMesh ran fine on 16p. I reran the 8p case to see if the new scotch changes the results significantly. The mesh started to diverge after a few iterations, but the final drag coefficients agreed within the first decimal place. Close enough for me.

I also tried the scotch-6.0.0 release, but snappyHexMesh failed at run time with an unresolved symbol.

Hope this helps.
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Old   December 27, 2012, 07:01
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Bruno Santos
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wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
Greetings Dan and welcome to the forum!

Many thanks for sharing this information! Now I understand better why this bug report was made a year ago:

Hopefully in the next major release of OpenFOAM, they'll update the Scotch library version.

Best regards,
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