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 The information provided may be out of date.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.
Calculating EM Force in the Electromagnetic Waves (emw) Environment
Posted 17.12.2012, 09:11 GMT-5 Low-Frequency Electromagnetics, RF & Microwave Engineering, Structural Mechanics Version 4.3a 1 Reply
Please login with a confirmed email address before reporting spam
This should be a very straightforward question. I would like to calculate the time-averaged electromagnetic force (via integrating the Maxwell Stress tensor over a surface). The fields that I need are taken from the Electromagnetic Waves (emw) physics environment. There is no node available for "Force Calculation", as there is in some of the AC/DC environments. However, I do see that I can perform surface integrations in post-processing and that I have access to the z-component, etc., of the Maxwell Stress Tensor. However, this is confusing to me, since there are only 3 components available and there should be 9 components of the Maxwell Stress Tensor (it's a 3x3 matrix). Moreover, I was wondering if the integration is considering the surface normal of the surface of interest. I am interested in doing this for both a 3D case and a 2D axially-symmetric case.
So then, two main questions:
1) Why are there only 3 components available for the Maxwell Stress Tensor?
2) I would like to calculate the force using the Electromagnetic Waves (emw) environment. Can I do this?
Thanks for your help,
Brian
Hello Brian Tierney
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
I have the same question with you .
I just want to know how to to calculate the force in the RF module.
Do you have any suggestions?
Best regards!