Discussion Forum

Hi all, I'm new to COMSOL, so please bear with me.

I head earlier asked about capacitance and its models. Upon spending some time learning my way around COMSOL, I came up with something. What I'm trying to do is model a planar capacitor with 2 open plates. I was suggested on my previous post to use the electrostatic model, which is what I did. I found 2 tutorials on capacitors in COMSOL and applied that and looked at a few models to come up with the following.

Since I'm still a noob at this, I would kindly ask someone to just take a look at my model/report and lemme know if what I did was indeed correct. My capacitor plates are 9cmx9cm and they're placed adjacent to each other. I am giving an excitation of 20V.

I then proceed to look at the frequency dependency of from 20kHz to 100kHz range with my excitation voltage of 20V. However, I'm getting an error when I try to add a slice regarding the 'volumetric loss density, electric'. It says undefined variable 'mod1.ec.Qrh' geom1 domain: 1 . I dont understand why this is coming since I'm following the article on freq. domain modeling of capacitor and they don't explicitly mention to add any variable called 'ec.Qrh' or something similar.

Thanks a lot for your help and time! :)