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 The information provided may be out of date.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.

force calculation use the Maxwell stress tensor

Please login with a confirmed email address before reporting spam

Hello everyone:
I'm new to comsol and I have some questions as follows:
I have a model for force calculation of nanorod structure by the Maxwell stress tensor.
I use the expression as "emw.dnTx" to calculate the force (x component) . but the result is terrible.

firstly, I don't know the explicit definition of the expression"emw.dnTx". I just get the expression from a friend in the forum. But I don't know how to use it correctly.
Who can give me some refferences or relevant information? Thanks!

secondly, anyone has the similar model or the suggestion?

My model has been attached.
In the results-> derive value, I choose a surface and integrate it. The expression is "emw.dnTx"


1 Reply Last Post 15.07.2014, 17:04 GMT-4
COMSOL Moderator

Hello Zerong Yuan

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.


Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 15.07.2014, 17:04 GMT-4
Hi Yuan,
Try es.dnTex and en.dnTey instead of emw.dnTx and emw.dnTy if you need to calculate only electrostatic force on the boundary.

Cheers
Hi Yuan, Try es.dnTex and en.dnTey instead of emw.dnTx and emw.dnTy if you need to calculate only electrostatic force on the boundary. Cheers

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.