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PML v4.0

Posted Apr 16, 2013, 8:30 a.m. EDT RF & Microwave Engineering, Wave Optics Version 4.0, Version 5.2 6 Replies

Ramona De Luca
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Hi all.

I would like to use the PML for a time-dependent analysis in the Structural Mechanics Module (version 4.0), but it doesn't look to work well.

Can you help me to implement the PML in my model? Can you suggest me some examples?

Many thanks.
Ramona
6 Replies Last Post Jul 25, 2017, 10:29 a.m. EDT
Sergei Yushanov Certified Consultant
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Posted: 1 decade ago Apr 16, 2013, 8:59 a.m. EDT
Ramona,

PML would not work properly for a time-dependent analysis for version 4.0 of Structural Mechanics Module. Low Reflecting Boundary should be used instead of PML for time-dependent analysis, but this type of boundary condition is available in 4.3a only.

Regards,
Sergei
Ramona, PML would not work properly for a time-dependent analysis for version 4.0 of Structural Mechanics Module. Low Reflecting Boundary should be used instead of PML for time-dependent analysis, but this type of boundary condition is available in 4.3a only. Regards, Sergei
Ramona De Luca
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Posted: 1 decade ago Apr 16, 2013, 9:58 a.m. EDT
Hi Sergei.

Thanks for your reply.

Do you know if the PML in the time domain works in Comsol version 3.5a (Structural Mechanics module)?

Best regards.
Ramona
Hi Sergei. Thanks for your reply. Do you know if the PML in the time domain works in Comsol version 3.5a (Structural Mechanics module)? Best regards. Ramona
Sergei Yushanov Certified Consultant
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Posted: 1 decade ago Apr 16, 2013, 10:53 a.m. EDT
Ramona,

No, PML in the time domain is not available in 3.5a.

Regards,
Sergei
Ramona, No, PML in the time domain is not available in 3.5a. Regards, Sergei
Pedro Pampillón
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Posted: 7 years ago Jun 29, 2017, 7:02 a.m. EDT
Hi Sergei.

How is the accuracy of PML in version 5.3 for time-dependent study?

Why the PML doesn't work at all in time-dependent studies?

Thanks!
Hi Sergei. How is the accuracy of PML in version 5.3 for time-dependent study? Why the PML doesn't work at all in time-dependent studies? Thanks!
Sergei Yushanov Certified Consultant
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Posted: 7 years ago Jun 29, 2017, 8:14 a.m. EDT
Pedro,

PML was originally developed by J.-P. Berenger in 1994 for electromagnetic waves in frequency domain.
PML imposes a complex-valued mathematical coordinate transformation to eliminate wave back-reflection at interface. And because of complex-valued nature of this transformation, it is inherently applicable to wave propagation in frequency domain, since frequency domain deals with complex valued fields (phasors and phase).

The only wave propagation physics interface with PMLs available in time domain is Pressure Acoustics starting version 5.3. Structural and electromagnetic wave interfaces do not have PLMs in time domain.

Regards,
Sergei
Pedro, PML was originally developed by J.-P. Berenger in 1994 for electromagnetic waves in frequency domain. PML imposes a complex-valued mathematical coordinate transformation to eliminate wave back-reflection at interface. And because of complex-valued nature of this transformation, it is inherently applicable to wave propagation in frequency domain, since frequency domain deals with complex valued fields (phasors and phase). The only wave propagation physics interface with PMLs available in time domain is Pressure Acoustics starting version 5.3. Structural and electromagnetic wave interfaces do not have PLMs in time domain. Regards, Sergei
昆 唐
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Posted: 7 years ago Jul 25, 2017, 10:29 a.m. EDT
Sergei,

Low Reflecting Boundary for time-dependent analysis does not solve the problem also, especially for the 3d simulations. Is there another option in Comsol 5.2, to reduce the reflection of boundary in time-dependent analysis?


Regards,
Kun
Sergei, Low Reflecting Boundary for time-dependent analysis does not solve the problem also, especially for the 3d simulations. Is there another option in Comsol 5.2, to reduce the reflection of boundary in time-dependent analysis? Regards, Kun

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