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 The information provided may be out of date.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.

Surface charge density of a floating potential electrode

Please login with a confirmed email address before reporting spam

Hi,

I try to analyze the charge distribution of a floating potential electrode. so I simulate the surface charge density of a floating potential electrode in eletric field. Please see the attachment. I choose boundary condition of this eletrode is floating potential (charge is 0 C), solver can also work, but there is error if I plot the surface charge density.

"can not evaluate expression:
fail to evaluate variable
variable: mod1.es.nD
fail to evaluate expression:
expression:mod1.es.nD"

I don't know what is wrong about the boundary condition? Or another words, how can I set up the floating potential electrodes in E-field?

thank you very much!


0 Replies Last Post 16 mag 2011, 13:48 GMT-4
COMSOL Moderator

Hello Yu Wang

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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.