Menu

Discussion Forum

New Discussion
查找

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Electric field enhancement on the tip in electrostatic module

Posted 2016年9月13日 GMT-4 09:04 1 Reply

Valerii Ie
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello all,
I am beginer in Comsol and now trying to model electric field redistribution in dielectric between cathode and anode. Where, cathode has shape of the tip of defined radius. I placed geometry and materials in the model and computed with Electrostatics module. However, didn't find yet how to add physics of field enhancement phenomena (e.g. dependence of radius of tip, the height of the tip etc).
So the question is how to model this object? The example model or a tutorial will help alot.

Best regards
1 Reply Last Post 2016年9月14日 GMT-4 17:36
Robert Koslover Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 8 years ago 2016年9月14日 GMT-4 17:36
If you know already how to model a simple parallel plate capacitor, then you know how to solve this problem too. You don't have to add any special physics to model the enhancement to the electric field at the tip of the electrode. The electric field is computed/available when the electrostatic solution (the potential) is found. So assign potentials to your cathode and anode (much like you would to the plates of a capacitor), solve the electrostatic problem, and then plot the fields. Be sure to use a fine mesh in the vicinity of the tip so that you minimize numerical errors there.
If you know already how to model a simple parallel plate capacitor, then you know how to solve this problem too. You don't have to add any special physics to model the enhancement to the electric field at the tip of the electrode. The electric field is computed/available when the electrostatic solution (the potential) is found. So assign potentials to your cathode and anode (much like you would to the plates of a capacitor), solve the electrostatic problem, and then plot the fields. Be sure to use a fine mesh in the vicinity of the tip so that you minimize numerical errors there.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content