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Not abel to select continuity

Giunti Giustiniano
Hi,
I'm tried to make a MF model, but I encountered a problem : the option continuity n x (H1-H2)=0 is disabled for any element. I need to define this boundary condition, continuity, to modelling correctly yhe problem, for assure continuity of two different material (in paritcular air and alluminum). Why this potion is disabled?

1 Reply Last Post Oct 9, 2012, 12:35 PM EDT
Erik Bornhöft COMSOL Employee
Posted: 5 years ago Oct 9, 2012, 12:35 PM EDT
Hi,

continuity is the default boundary condition on any inner boundary. You only need to manually set this when using "Form Assembly" in your geometry. Usually that is only necessary for contact problems in structural mechanics.

If you need to define assemblies for some reason, you need to create (or let COMSOL auto-create) "identity pairs" within "Definitions" at overlapping boundaries. You can then define a "Continuity Pair" by rightclicking on "Magnetic Fields" and choosing "Pairs->Continuity" and selecting one of the pairs defined in "Definitions".

Hope that helps!

Best regards,
Erik

*********************
Senior Technical Sales Engineer
COMSOL Multiphysics GmbH
Berliner Str. 4
37073 Göttingen
Deutschland

Knowledge Base:
www.comsol.de/support/knowledgebase/browse/900/

COMSOL Blog:
www.comsol.de/blogs/
Hi, continuity is the default boundary condition on any inner boundary. You only need to manually set this when using "Form Assembly" in your geometry. Usually that is only necessary for contact problems in structural mechanics. If you need to define assemblies for some reason, you need to create (or let COMSOL auto-create) "identity pairs" within "Definitions" at overlapping boundaries. You can then define a "Continuity Pair" by rightclicking on "Magnetic Fields" and choosing "Pairs->Continuity" and selecting one of the pairs defined in "Definitions". Hope that helps! Best regards, Erik ********************* Senior Technical Sales Engineer COMSOL Multiphysics GmbH Berliner Str. 4 37073 Göttingen Deutschland Knowledge Base: http://www.comsol.de/support/knowledgebase/browse/900/ COMSOL Blog: http://www.comsol.de/blogs/

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