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 The information provided may be out of date.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.

Results of Parametric Sweep Study in Electrostatics

Please login with a confirmed email address before reporting spam

Hello!

I'm doing an electrostatic simulation in 2D. I tried to change some model parameters and solved
some line integration (with different Expression)
The out put looks like this (more readable in the attached file):

dummy body_right_distance epsr_body_right Electric potential (V) reacf(V) Capacitance (F)
1 0 1 0 1.82772e-12 4.6351e-11
2 0 80 51.14669 0 1.32642e-9
3 0.1 1 49.2481 0 9.84629e-10
4 0.1 80 47.16981 0 1.0747e-9
5 0.2 1 40.64887 0 8.80712e-10
6 0.2 80 17.34921 1.22422e-12 4.25136e-10
7 0.3 1 0 1.82781e-12 4.63526e-11
8 0.3 80 0 1.9821e-12 4.75052e-11

I don't understand why I get zero values at some positions when evaluating the electric potential
although the reaction force of V is exactly inverse to it???

Thanks for you help,
Thomas


2 Replies Last Post 30 nov. 2011, 11:25 UTC−5

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 29 nov. 2011, 06:36 UTC−5
... another mystery:

I tried it with the following parameter values (three parameters: dummy position eps_r):
1 0 1 2 0 80 3 0.1 1 4 0.1 80 5 0.2 1 6 0.2 80 7 0.3 1
and it worked.
When I added one more:
1 0 1 2 0 80 3 0.1 1 4 0.1 80 5 0.2 1 6 0.2 80 7 0.3 1 8 0.3 80

it doesn't work any more, means I get some zero values in the result!

I really don't understand the difference??




... another mystery: I tried it with the following parameter values (three parameters: dummy position eps_r): 1 0 1 2 0 80 3 0.1 1 4 0.1 80 5 0.2 1 6 0.2 80 7 0.3 1 and it worked. When I added one more: 1 0 1 2 0 80 3 0.1 1 4 0.1 80 5 0.2 1 6 0.2 80 7 0.3 1 8 0.3 80 it doesn't work any more, means I get some zero values in the result! I really don't understand the difference??

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 30 nov. 2011, 11:25 UTC−5
Hi

indeed not very logical, at least not with only this info, if it repeats regularly it's worth to send the model and the description to "support". They should be able to give your more info

--
Good luck
Ivar
Hi indeed not very logical, at least not with only this info, if it repeats regularly it's worth to send the model and the description to "support". They should be able to give your more info -- Good luck Ivar

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.