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Electric Field Distribution in COMSOL

Posted Mar 2, 2019, 6:58 a.m. EST Electromagnetics, Low-Frequency Electromagnetics, Studies & Solvers Version 5.4 3 Replies

Fatima Khurshid
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I am trying to simulate a problem in COMSOL, whereby I have to study the difference in electric field distribution using different liquids as dielectrics. I have constructed a 2-D geometry with a point plane electrode configuration using oil as a dielectric material. My constitutive relation for Electric Field is relative permittivity. However, when I change the value of relative permittivity using same or different types of oil, the electric field distribution doesnot change. I can not figure out where the problem lies and need help with the simulation.

3 Replies Last Post Mar 2, 2019, 8:59 a.m. EST
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago Mar 2, 2019, 8:02 a.m. EST

Fatima,

if you have potential BCs on the electrodes neither the potential distribution nor the field distribution depends on permittivity. Only with charge BCs potential and field will change with permittivity.

Cheers Edgar

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Fatima, if you have potential BCs on the electrodes neither the potential distribution nor the field distribution depends on permittivity. Only with charge BCs potential and field will change with permittivity. Cheers Edgar
Fatima Khurshid
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Posted: 6 years ago Mar 2, 2019, 8:20 a.m. EST

Thank you for you help. Can you please elaborate as to your suggestion. If I assign charge BCs to my electrodes, I will still need to assign a potential BC as well, for the formation of field?

Thank you for you help. Can you please elaborate as to your suggestion. If I assign charge BCs to my electrodes, I will still need to assign a potential BC as well, for the formation of field?
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago Mar 2, 2019, 8:59 a.m. EST

No, you can't use charge density and potential at the same boundary. The charge will result in some potential and this in turn will be dependent on the dielectric. I would recommend some textbook about basic electrostatics.

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
No, you can't use charge density and potential at the same boundary. The charge will result in some potential and this in turn will be dependent on the dielectric. I would recommend some textbook about basic electrostatics.

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