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How to calculate the wave's power which pass through an edge before a PML layer?

Posted May 3, 2016, 10:17 a.m. EDT RF & Microwave Engineering, Structural Mechanics Version 5.2 4 Replies

Han Wu
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Hello,
I am now building a 2D structure which is half-infinite, which I should add a PML layer.
Wave incident to the structure and I would like to calculate how much power it remains after passing through it.
I know it is easy to use port BC to get S-parameter to get the Transmission, Reflection and Absorption, but if there is a PML layer, I think there is no way to set a port.
So is there a way to calculate the power at an edge?

Thanks a lot!
Han

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4 Replies Last Post Dec 14, 2016, 10:34 a.m. EST
Robert Koslover Certified Consultant
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Posted: 9 years ago May 4, 2016, 2:06 p.m. EDT
You can do a line integral of the component of the Poynting vector (e.g., emw.Poavy) along the edge of interest to you. There are several ways to set up such an integral. For example: (1) as a probe, or (2) as a post-computation derived value

For the first approach, go to: Component 1---> Definitions . Right-click Definitions, choose Probes --> Boundary Probe. Change Type to Integral. Choose the boundary in question. Under expression, choose the appropriate Poynting vector component. Then either plot or evaluate/tabulate this probe value after you run the model.

For the second approach, run the model first, then go to Results --> Derived Values. Right-click Derived Values and choose Integration --> Line Integration. Under expression, choose the appropriate Poynting vector component. Then click on "Evaluate".

You can do a line integral of the component of the Poynting vector (e.g., emw.Poavy) along the edge of interest to you. There are several ways to set up such an integral. For example: (1) as a probe, or (2) as a post-computation derived value For the first approach, go to: Component 1---> Definitions . Right-click Definitions, choose Probes --> Boundary Probe. Change Type to Integral. Choose the boundary in question. Under expression, choose the appropriate Poynting vector component. Then either plot or evaluate/tabulate this probe value after you run the model. For the second approach, run the model first, then go to Results --> Derived Values. Right-click Derived Values and choose Integration --> Line Integration. Under expression, choose the appropriate Poynting vector component. Then click on "Evaluate".
Han Wu
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Posted: 9 years ago May 6, 2016, 1:41 a.m. EDT
It works! Thanks a lot!
It works! Thanks a lot!
Chenchen Liu
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Posted: 8 years ago Dec 13, 2016, 10:01 p.m. EST
Hi,

What if I use structural mechanics module (frequency domain)? How can I compute the energy of elastic wave passing through a surface?

Thank you very much!
Hi, What if I use structural mechanics module (frequency domain)? How can I compute the energy of elastic wave passing through a surface? Thank you very much!
Henrik Sönnerlind COMSOL Employee

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Posted: 8 years ago Dec 14, 2016, 10:34 a.m. EST
Hi,

For structural mechanics, you can user the mechanical energy flux variables that are discussed in this thread:

www.comsol.com/community/forums/general/thread/30845

Regards,
Henrik
Hi, For structural mechanics, you can user the mechanical energy flux variables that are discussed in this thread: https://www.comsol.com/community/forums/general/thread/30845 Regards, Henrik

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