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 The information provided may be out of date.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.

What's the difference between expression current density normal (ec.normJ) and normal current density(ec.nJ)

Please login with a confirmed email address before reporting spam

Hi,all,
When I calculate the current in the electric currents interface, I have to Integrate along one line in a 2D model.But which expression to choose is really a problem to me! What's the difference between expression current density normal (ec.normJ) and normal current density(ec.nJ).
I find the results using these two expression is quite different !
Can anyone give me some explaination! Thanks a lot!

1 Reply Last Post Jun 8, 2015, 12:59 p.m. EDT
Robert Koslover Certified Consultant

Please login with a confirmed email address before reporting spam

Posted: 9 years ago Jun 8, 2015, 12:59 p.m. EDT
The variable ec.normJ is the "norm" (aka, absolute magnitude) of the current density vector.
The variable ec.nJ is the component of the current vector that is "normal to" (aka, perpendicular to) a surface on which it is being evaluated.
The variable ec.normJ is the "norm" (aka, absolute magnitude) of the current density vector. The variable ec.nJ is the component of the current vector that is "normal to" (aka, perpendicular to) a surface on which it is being evaluated.

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.