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Capacitance from sinusoid voltage

Posted 7 dic 2013, 11:39 GMT-5 Low-Frequency Electromagnetics, Studies & Solvers Version 3.5a 3 Replies

Primož Cuznar
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Hi everyone!

For modeling I am using 3D Comsol Multiphysics // AC/DC module // Quasi Statics, electric // time harmonic analysis.
In postprocessing Comsol calculates and plots electric potential and some other predefined quantities at different time steps .
Electric potential in boundary condition is sine wave: 0.5*sin(2*pi*f*t[1/s])

Now, is it possible to calculate capacitance in those steps from electric potential?

Thanks for your reply
3 Replies Last Post 9 dic 2013, 07:26 GMT-5
Sarah
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Posted: 1 decade ago 7 dic 2013, 12:09 GMT-5
Hi,

Maybe this example can help you:
www.comsol.com/model/computing-capacitance-12689

Br,
Hi, Maybe this example can help you: http://www.comsol.com/model/computing-capacitance-12689 Br,
Primož Cuznar
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Posted: 1 decade ago 7 dic 2013, 12:29 GMT-5
Sarah thanks for the quick reply!

The problem is, that I have 3.5a version and cannot open the attached model file ... in pdf file I didn't find any results for capacitance, just electric potential and field in capacitor. Any other clue?
Sarah thanks for the quick reply! The problem is, that I have 3.5a version and cannot open the attached model file ... in pdf file I didn't find any results for capacitance, just electric potential and field in capacitor. Any other clue?
Primož Cuznar
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Posted: 1 decade ago 9 dic 2013, 07:26 GMT-5
Hi again!
Ok, maybe I found solution ... I added application mode: AC/DC module -> Statics, electric -> electrostatics. Computing time is much longer (3x),I get results, capacitance and admittance, but for now not sure if those results are alright.

Next:
What is the difference, in boundary condition, between port+forced voltage and just electric potential?
Do I have to insert voltage in both conditions (electric currents and electrostatics)?

Thanks for reply!
Hi again! Ok, maybe I found solution ... I added application mode: AC/DC module -> Statics, electric -> electrostatics. Computing time is much longer (3x),I get results, capacitance and admittance, but for now not sure if those results are alright. Next: What is the difference, in boundary condition, between port+forced voltage and just electric potential? Do I have to insert voltage in both conditions (electric currents and electrostatics)? Thanks for reply!

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