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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 The information provided may be out of date.

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Using Quarter Symmetry

Posted 2013年1月8日 GMT-5 08:00 Version 4.2 4 Replies

Ruzbeh
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Hi

I having problem using symmetry to simulate my model. For example I have a 3D ring and I want to use the quarter of the model to reduce the computation time. But how to use the quarter of the ring? Is it by drawing a quarter of a ring and then import to comsol or I can apply a quarter symmetry on the full model?
Thanks.
4 Replies Last Post 2013年8月20日 GMT-4 05:32
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 2013年1月8日 GMT-5 08:53
You can draw a quarter ring or import the full ring and cut out a quarter in COMSOL. You can do that by creating a block (at the right location) and taking the intersection of that block with the full ring.
You can draw a quarter ring or import the full ring and cut out a quarter in COMSOL. You can do that by creating a block (at the right location) and taking the intersection of that block with the full ring.
Ruzbeh
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Posted: 1 decade ago 2013年1月8日 GMT-5 09:37
As I am interested in mode shape and eigenfrequency, how do I define the boundary conditions? I have put symmetry boundary condition on both sides of the quarter ring, but I the results don't seem to be what I expected. Is there any role of anti symmetry here?
As I am interested in mode shape and eigenfrequency, how do I define the boundary conditions? I have put symmetry boundary condition on both sides of the quarter ring, but I the results don't seem to be what I expected. Is there any role of anti symmetry here?
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 2013年1月8日 GMT-5 10:26
With symmetry you only get a subset of all eigenmodes (the symmetric ones only). To get more the rest you should solve again with antisymmetry boundary conditions.
With symmetry you only get a subset of all eigenmodes (the symmetric ones only). To get more the rest you should solve again with antisymmetry boundary conditions.
Md. Selim Habib
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Posted: 1 decade ago 2013年8月20日 GMT-4 05:32
Hi,
I have designed photonic crystal fiber. Now i want to simulated only quarter symmetry of the fiber for the less computation time. How can solve?

Thanks in advance.
Hi, I have designed photonic crystal fiber. Now i want to simulated only quarter symmetry of the fiber for the less computation time. How can solve? Thanks in advance.

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