Menu

Discussion Forum

New Discussion
查找

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 The information provided may be out of date.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.

how to model random " conductivity" variation?

Posted 2012年3月16日 GMT-4 01:50 Materials, Mesh Version 4.2, Version 4.2a 7 Replies

Ted Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi,
I am doing an AC/DC study of spreading resistance. for example, I have a fixed shape block of Semiconductor (poly-Si) which is made of small grains(polycrystalline ). these small grains has slight variation on the conductivity, let us say their value falls within +/- 0.1% of the standard value. now I want to simulate this situation in my model. I think Mesing will take care of cut the semiconductor block into small pieces, and I assume I should use a random function to add to the materials' conductivity for simulation of the variation, but I don't know the correct procedure to set it up. could you guys give me some suggestions?

regards,
7 Replies Last Post 2012年12月3日 GMT-5 01:36
Ted Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月21日 GMT-4 02:49
hi,
can anyone shine some light on this? or do I have to use Matlab to do this?

regards,
hi, can anyone shine some light on this? or do I have to use Matlab to do this? regards,
Ralf Tschiesche
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月21日 GMT-4 10:58
Hi!

Please find attached a very simple example for variation with random function for 4.2a.

Ralf
Hi! Please find attached a very simple example for variation with random function for 4.2a. Ralf
Ted Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月21日 GMT-4 13:48
Hi, Ralf,
thanks, but I did not see the attachment.

regards,
ted
Hi, Ralf, thanks, but I did not see the attachment. regards, ted
Ted Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月22日 GMT-4 00:48
Ralf,
thanks , I got the attached file. Probably internet browser's problem, Chrome vs. Firefox. now I built my own random variation model as attached. but I have another concern: once I mesh the stricture and COMSOL assign the random conductivity variation to each element, I want to keep this meshing fixed (with the corresponding conductivity). then later I could retreat the structure with the same spatial elements, and the same conductivity variation to each element, in order to study the impact of the variation on my measurement cross the wafer. I know you could export the meshing, later import it back. but I wonder when you export the mesh, will COMSOL export the corresponding material properties too? like the conductivity in this case.


my model is too big to attach (it is not your browser's fault ^-^)

thanks,
ted
Ralf, thanks , I got the attached file. Probably internet browser's problem, Chrome vs. Firefox. now I built my own random variation model as attached. but I have another concern: once I mesh the stricture and COMSOL assign the random conductivity variation to each element, I want to keep this meshing fixed (with the corresponding conductivity). then later I could retreat the structure with the same spatial elements, and the same conductivity variation to each element, in order to study the impact of the variation on my measurement cross the wafer. I know you could export the meshing, later import it back. but I wonder when you export the mesh, will COMSOL export the corresponding material properties too? like the conductivity in this case. my model is too big to attach (it is not your browser's fault ^-^) thanks, ted
Ralf Tschiesche
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月22日 GMT-4 05:57
Hi!

Maybe you can export sigma to a text file (see export, without header), re-import it as a interpolation (see global definition->interpolation) and define sigma from this function (see material).

Ralf
Hi! Maybe you can export sigma to a text file (see export, without header), re-import it as a interpolation (see global definition->interpolation) and define sigma from this function (see material). Ralf
Ralf Tschiesche
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年3月22日 GMT-4 05:57
Hi!

Maybe you can export sigma to a text file (see export, without header), re-import it as a interpolation (see global definition->interpolation) and define sigma from this function (see material).

Ralf
Hi! Maybe you can export sigma to a text file (see export, without header), re-import it as a interpolation (see global definition->interpolation) and define sigma from this function (see material). Ralf
Ralf Tschiesche
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年12月3日 GMT-5 01:36
Hi!

Only for the sake of completeness: attached the models...

Ralf
Hi! Only for the sake of completeness: attached the models... Ralf

Attachments:

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.

Suggested Content