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 The information provided may be out of date.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.

unplausible resultsof ACDC module; export problem?

Please login with a confirmed email address before reporting spam

Hi,
I'm simulating an experiment and calculate the electric fields in my setup. The results are exported as a textfile which contains the result table. Those results are imported to MATLAB for further use.
While debugging I noticed, that the COMSOL results seem way off, as neighbouring meshpoints have extremely different field values (up to 10 orders of magnitude, differing signs).
My question is: Did I do something wrong while exporting, or should I look for mistakes in my model? Is this a known Problem?

I tried to include my model file, but the forum wouldn't let me (12 MB). So I try to explain some details in short:
rectangular grounded plate
hollow cylinder with electric potential above the ground plate, distance ~20 cm
That's basically it! there are two more plates further away, but that shouldn't be the problem...

Edit: Maybe some screenshots can clarify the whole problem. Screen1 is just an overview, screen2 a top view to show the cylinder in detail. A big block of air surrounding the whole thing is hidden both times to makes everything else visible.


1 Reply Last Post Jul 17, 2012, 4:22 a.m. EDT

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Jul 17, 2012, 4:22 a.m. EDT
So, I slightly modified my geometry: filling the cylinder and moving it up a bit helped a little. The differences in the electric field are a little lower now (still like 3-4 order of magnitude). Could that be for the strong field inside the cylinder? Any ideas?
So, I slightly modified my geometry: filling the cylinder and moving it up a bit helped a little. The differences in the electric field are a little lower now (still like 3-4 order of magnitude). Could that be for the strong field inside the cylinder? Any ideas?

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.