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what is difference between comsol version 3.4 and comsol version 3.5a?

Posted 27 janv. 2010, 21:47 UTC−5 1 Reply

chang yu-mei
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I have a simulation file of comsol old version software completion(comsol version3.4),now opening with the comsol new version(comsol version 3.5a). I didn't modify any parameter,after re- slicing a mesh but appear a different simulation result,what is difference between comsol version 3.4 and comsol version 3.5a? Would you give me some suggestions?

Thanks a lot in advance for your help.

Best Regards
Yu-Mei

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1 Reply Last Post 28 janv. 2010, 01:37 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 28 janv. 2010, 01:37 UTC−5
Hi

You have an important question there. I havnt observed that before, but such things happens.

I would suggest that you carefully check the BCs (boundary conditions), as the renumbering/indexing of your geometry might have been affected, at least that is where I would start.

There could also be some improvements on the normalisation of the solvers, if some of your matrices were ill conditionned then I would suspect that the newer results should be more precise.

I would also propose to dump the 3.4 as a "reset model" and "save as" ".m" file with a V3.4, then run it and generate a report. Then repeat the same procedure in v3.5a.
Finally, run a text comparator (à la Windiff or UltraCompare for me) on the two versions to try to identify any differences, as well on the .m file as on the html report

Unfortunately I have only a V3.5a running now.

Keep us informed, as this is important,
I assume "support" could also give you some clues, the "whats new" doc might bring you also some ideas.

Good luck
Ivar
Hi You have an important question there. I havnt observed that before, but such things happens. I would suggest that you carefully check the BCs (boundary conditions), as the renumbering/indexing of your geometry might have been affected, at least that is where I would start. There could also be some improvements on the normalisation of the solvers, if some of your matrices were ill conditionned then I would suspect that the newer results should be more precise. I would also propose to dump the 3.4 as a "reset model" and "save as" ".m" file with a V3.4, then run it and generate a report. Then repeat the same procedure in v3.5a. Finally, run a text comparator (à la Windiff or UltraCompare for me) on the two versions to try to identify any differences, as well on the .m file as on the html report Unfortunately I have only a V3.5a running now. Keep us informed, as this is important, I assume "support" could also give you some clues, the "whats new" doc might bring you also some ideas. Good luck Ivar

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