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simulate AC voltage phase shift due to medium property discontinuity
Posted Mar 19, 2012, 3:15 p.m. EDT Low-Frequency Electromagnetics, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2 2 Replies
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I am rather new to COMSOL so I have attached my model just in case I accidentally confused you.
I want to simulate the phase shift of AC electric signal due to discontinuity of medium property. So I have basically two electrodes(one grounded, another applied an AC potential ==>V*e^(jwt)) in a tank of water. I want to see the phase shift caused by the introduction of material of different dielectric property.
I have used the AC/DC module and ran a frequency analysis at 1KHz and 100KHz. The boundary condition at the electrode is set to 4 and GND. At two different frequencies, i do see different field lines. Here comes the questions
1. when I set the BC to be 4V and use frequency domain analysis, does COMSOL consider the potential to be time variant?
2. How can I see the complex voltage from the frequency simulation?When I click on the plot, i am always getting real voltages. I want to see how much the phase has been changed due to the introduction of the object.
I am not even sure I am using the correct model. But by varying the frequency, I clearly see the change of object property. From insulating to conducting? But why can't I have the complex potentials?
Thanks a lot!
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according to your questions:
1. Yes a harmonic voltage is applied
2. The field quantities are complex, just use the real() and imag() operators to get the complex components.
Cheers
Edgar
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