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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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combining overlapping objects at selected boundaries

Posted 2013年10月31日 GMT-4 14:53 Version 4.1 4 Replies

Szymon Sowizral
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Hello, I'm trying to combine objects which overlap with more boundaries. How can I select boundaries at which objects should be fixed? or how to split objects but only at selected boundaries?

In attachment there is an example picture. I want to combine object 3 with objects 1 and 2, but still leave objects 1 and 2 disconected at the boundary between them. Forming assembly I get 3 separated objects. Forming union I get 1 object, but without the 'cut' between 1 and 2? Does anyone know how to solve this problem?

Best regards, Szymon

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4 Replies Last Post 2013年11月1日 GMT-4 06:48
Josh Thomas Certified Consultant
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Posted: 1 decade ago 2013年10月31日 GMT-4 15:00
Szymon-

I think you may need to split your system into three objects and use a form assembly. Then, under the definitions and physics set-up define identity/continuity of dependent variables on the boundaries that you would to be "connected." In this way, the boundary between object 1 and object 2 can be disconnected while the boundaries between object 3 and the other two objects can be connected.

--
Best regards,
Josh Thomas
AltaSim Technologies
Szymon- I think you may need to split your system into three objects and use a form assembly. Then, under the definitions and physics set-up define identity/continuity of dependent variables on the boundaries that you would to be "connected." In this way, the boundary between object 1 and object 2 can be disconnected while the boundaries between object 3 and the other two objects can be connected. -- Best regards, Josh Thomas AltaSim Technologies
Szymon Sowizral
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Posted: 1 decade ago 2013年10月31日 GMT-4 15:44
Thank You for reply.
I cannot find where to define 'identity/continuity of dependent variables'. Is it under identity pairs? I'm not sure if it will work for my aplication. I am using Solid mechanics to simulate deformations coused by internal stress. If I leave it as assembly of 3 objects and use identity pairs it still deforms as all objects are disconected.
Thank You for reply. I cannot find where to define 'identity/continuity of dependent variables'. Is it under identity pairs? I'm not sure if it will work for my aplication. I am using Solid mechanics to simulate deformations coused by internal stress. If I leave it as assembly of 3 objects and use identity pairs it still deforms as all objects are disconected.
Josh Thomas Certified Consultant
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Posted: 1 decade ago 2013年10月31日 GMT-4 16:19
Two places...

They need to be defined under Model>Definitions as either contact pair or identity pair boundaries.

Then under the Solid Mechanics physics under Pairs you define contact or continuity.

--
Best regards,
Josh Thomas
AltaSim Technologies
Two places... They need to be defined under Model>Definitions as either contact pair or identity pair boundaries. Then under the Solid Mechanics physics under Pairs you define contact or continuity. -- Best regards, Josh Thomas AltaSim Technologies
Szymon Sowizral
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Posted: 1 decade ago 2013年11月1日 GMT-4 06:48
thanks, It's working
thanks, It's working

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