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Floquet periodic BC in Acoustic module
Posted May 9, 2010, 9:41 a.m. EDT 2 Replies
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Hi!
I have a problem to calculate a plane wave at oblique incidence in Acoustic module. In RF module to successfully simulate this wave I use Floquet periodic BC, this BC are available there. In Acoustic module periodic BC have to be specified in menu Physics->Periodic conditions->Periodic boundary conditions, and, at the same time, in menu Physics->Boundary Setting the Sound hard boundary (wall) BC for the same boundary have to be set. By doing this, it is easy to calculate the normal incidence, setting continuity periodic BC. But I did not find the way to specify Floquet periodic BC in Acoustic module. Please take a look at the figure.
So, does anyone know is it possible at all to specify Floquet periodic BC in Acoustic module, and how?
Thank you!
I have a problem to calculate a plane wave at oblique incidence in Acoustic module. In RF module to successfully simulate this wave I use Floquet periodic BC, this BC are available there. In Acoustic module periodic BC have to be specified in menu Physics->Periodic conditions->Periodic boundary conditions, and, at the same time, in menu Physics->Boundary Setting the Sound hard boundary (wall) BC for the same boundary have to be set. By doing this, it is easy to calculate the normal incidence, setting continuity periodic BC. But I did not find the way to specify Floquet periodic BC in Acoustic module. Please take a look at the figure.
So, does anyone know is it possible at all to specify Floquet periodic BC in Acoustic module, and how?
Thank you!
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2 Replies Last Post Jun 1, 2010, 6:34 p.m. EDT
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Posted:
1 decade ago
Hi Maxim,
I used floquet periodic BC in RF module to study the tilted incident planar light to the infinite long dielectric layer, can you let me know how can set the boundary condictions to get the the pattern you showed in the attached. Thanks.
I used floquet periodic BC in RF module to study the tilted incident planar light to the infinite long dielectric layer, can you let me know how can set the boundary condictions to get the the pattern you showed in the attached. Thanks.
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Posted:
1 decade ago
Hi Weibin,
Take a look at the tutorial model called "Periodic Boundary Condition", it has a detailed description in the help system. I used Comsol 3.5. The pictures are from there.
Moreover, I have figured out what was a problem I faced while running acoustic simulation. I forgot to select the "Use Hermitian transpose of constraint matrix and in symmetry detection" check box on the Advanced page in the Solver Parameters dialog box. Do not forget to check it. So, the same technique works perfectly in acoustic.
Good luck!
Maxim
Take a look at the tutorial model called "Periodic Boundary Condition", it has a detailed description in the help system. I used Comsol 3.5. The pictures are from there.
Moreover, I have figured out what was a problem I faced while running acoustic simulation. I forgot to select the "Use Hermitian transpose of constraint matrix and in symmetry detection" check box on the Advanced page in the Solver Parameters dialog box. Do not forget to check it. So, the same technique works perfectly in acoustic.
Good luck!
Maxim