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defining a variable

Posted Jan 7, 2021, 4:43 p.m. EST 1 Reply

Mohsin Ijaz
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Hi,

I want to investigate transmission from simply metal to air interface. If i need to define transmission in variables, then how can i define it in term of power? as value of power already defined in port boundary condition (Pin). Or is there any other method for this ?

Looking for helpful suggestions/comments.

Thanks in advance,

1 Reply Last Post Jan 8, 2021, 10:09 p.m. EST
Robert Koslover Certified Consultant
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Posted: 4 years ago Jan 8, 2021, 10:09 p.m. EST
Updated: 4 years ago Jan 8, 2021, 10:10 p.m. EST

Ports are only some of the many ways to manage/analyze power inputs and outputs. You can define probes, coupling variables, and can execute post-processing integrations as well, among other possibilities. You can integrate power densities over surfaces to compute powers. You can integrate the normal-to-the-surface component of a power density vector over a surface, to compute the power flow through it. For example, if using probes, go to the Model Builder and right-click on "Definitions" under Component 1, and choose Probes --> Boundary Probe. Then in the Settings panel, change Type from Average to Integral. Choose the surface of interest to you, then put the appropriate power density expression in the "Expression:" box. As another example, on the post-processing side, Right-click "Derived Values" under the Results heading. Then choose Integration --> Surface Integration. The rest is pretty similar to before. Notice also the "Evaluate" button right near the top of the Settings/Surface Integration panel. You can also set up integration operators under Definitions --> Nonlocal Couplings --> Integration. If you experiment with these things, and read more about them in the Help system, you'll eventually figure out what works best for you in your particular circumstances. Good luck.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Ports are only *some* of the *many* ways to manage/analyze power inputs and outputs. You can define probes, coupling variables, and can execute post-processing integrations as well, among other possibilities. You can integrate power densities over surfaces to compute powers. You can integrate the normal-to-the-surface component of a power density vector over a surface, to compute the power flow through it. For example, if using probes, go to the Model Builder and right-click on "Definitions" under Component 1, and choose Probes --> Boundary Probe. Then in the Settings panel, change Type from Average to Integral. Choose the surface of interest to you, then put the appropriate power density expression in the "Expression:" box. As another example, on the post-processing side, Right-click "Derived Values" under the Results heading. Then choose Integration --> Surface Integration. The rest is pretty similar to before. Notice also the "Evaluate" button right near the top of the Settings/Surface Integration panel. You can also set up integration operators under Definitions --> Nonlocal Couplings --> Integration. If you experiment with these things, and read more about them in the Help system, you'll eventually figure out what works best for you in your particular circumstances. Good luck.

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