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Question about periodic boundary condition

Posted Aug 8, 2014, 12:51 a.m. EDT Low-Frequency Electromagnetics, Geometry Version 4.4 4 Replies

Donggyu Jang
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Hello.

I'm wondering what periodic boundary condition means.

I mean, I have a geometry which has clear symmetric with respect to xy plane.

I guess I really need to simulate just one of the half of the whole if I can apply symmetric condition to xy plane.

Ansys has that feature and in COMSOL, 'periodic boundary condition' has the same role to this.

Am I right?

If not, How do I apply that kind of condition to the symmetric plane?
4 Replies Last Post Aug 29, 2016, 10:29 a.m. EDT
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Aug 11, 2014, 11:19 a.m. EDT
Hi Donggyu,

COMSOL has a symmetry condition which you can apply to the boundaries on your symmetry plane. The periodic boundary conditions are more “advanced”. You should use them if you have a periodic structure or cyclic symmetry. There are several examples in the COMSOL Model Gallery on periodic structures (for example Model ID 1974).

Nagi Elabbasi
Veryst Engineering
Hi Donggyu, COMSOL has a symmetry condition which you can apply to the boundaries on your symmetry plane. The periodic boundary conditions are more “advanced”. You should use them if you have a periodic structure or cyclic symmetry. There are several examples in the COMSOL Model Gallery on periodic structures (for example Model ID 1974). Nagi Elabbasi Veryst Engineering
Donggyu Jang
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Posted: 1 decade ago Aug 11, 2014, 10:30 p.m. EDT
Hello.

Thanks for reply!

And I have one somewhat stupid question. 'Where can I find symmetric boundary condition?'

I'm now using electrostatic model and only able to see 'periodic condition' rather than symmetric condition in the list of pop-up menu when I right-click on 'electrostatic'

I don't see any condition which name includes 'symmetric'

I'm suspecting that I just have to use 'periodic condition' but not sure since my model is not for infinite periodic.

Could you please give me more details?

Donggyu Jang
Hello. Thanks for reply! And I have one somewhat stupid question. 'Where can I find symmetric boundary condition?' I'm now using electrostatic model and only able to see 'periodic condition' rather than symmetric condition in the list of pop-up menu when I right-click on 'electrostatic' I don't see any condition which name includes 'symmetric' I'm suspecting that I just have to use 'periodic condition' but not sure since my model is not for infinite periodic. Could you please give me more details? Donggyu Jang
Pieter Westerik
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Posted: 1 decade ago Aug 13, 2014, 8:21 a.m. EDT
I think you can only have symetry in a plane in an electrostatic model if the electric field lines near that plane are parallel to that plane. Such a symmetry is also achieved with the 'Zero Charge' condition I believe.
I think you can only have symetry in a plane in an electrostatic model if the electric field lines near that plane are parallel to that plane. Such a symmetry is also achieved with the 'Zero Charge' condition I believe.
Nguyen Duy Duc
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Posted: 8 years ago Aug 29, 2016, 10:29 a.m. EDT
Dear Nagi Elabbasi

I have a question. Can Periodic Boundary Condition is used together with Symmetry Boundary Condition, in the case that the Symmetry BC removes one required boundary of Periodic BC ?

Best regards
Duc
Dear Nagi Elabbasi I have a question. Can Periodic Boundary Condition is used together with Symmetry Boundary Condition, in the case that the Symmetry BC removes one required boundary of Periodic BC ? Best regards Duc

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