Menu

Discussion Forum

New Discussion
Filtrer

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

weak constraint in" benchmark model of ccp"

Posted 21 nov. 2014, 05:58 UTC−5 Plasma Physics Version 4.4 2 Replies

Youb HM
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi ,guys. I am confused by the use of weak constraint in model library ”Benchmark model of a capacitively coupled plasma" .more specific I don't understand why "J_total= intop1(-d(V_lm,t))" ,ie the total current density equals the time derivative of the Lagrange multiplier of electric potential.
Could you guys tell me what indeed "V_lm" is and how it relates to the total current density at the driven electrode? Thanks a lot!
2 Replies Last Post 21 nov. 2014, 15:53 UTC−5
Daniel Smith COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 21 nov. 2014, 09:03 UTC−5
V_lm corresponds to the normal electric displacement flux, n . D from Poisson's equation. Thus, -d(V_lm,t) represents the displacement current density. Weak constraints are needed to get an accurate solution. In V5.0, the model has been updated to use the new Terminal feature, which allows you to simply type in an expression for the Terminal current. All of the correct equations are now generated under the hood. You can see this in the same model in V5.0.
V_lm corresponds to the normal electric displacement flux, n . D from Poisson's equation. Thus, -d(V_lm,t) represents the displacement current density. Weak constraints are needed to get an accurate solution. In V5.0, the model has been updated to use the new Terminal feature, which allows you to simply type in an expression for the Terminal current. All of the correct equations are now generated under the hood. You can see this in the same model in V5.0.
Youb HM
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 21 nov. 2014, 15:53 UTC−5
Thank you very much
Thank you very much

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