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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Where is the Curl operator in the PDE physics?

Posted 2012年9月1日 GMT-4 03:58 Low-Frequency Electromagnetics, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 3 Replies

Jan
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Hello,

I tried to modify the PDE from the rotating machinery physics a little and wanted to define it in the PDE physic.
The problem I have is that I can't see any curl operators in the coeficient or the general form. The original equations are:

sigma* dA/dt + curl(H) - sigma v x B = J
and
B= curl(A)

I'm sure there is a way to define both equations. Maybe I could use the diveregence operator with a matrix or something else...

Thanks in advance
3 Replies Last Post 2012年9月2日 GMT-4 08:21
Pu
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Posted: 1 decade ago 2012年9月1日 GMT-4 08:57
Hi,

In COMSOL vectorial PDE's cannot be input directly. You need to rewrite it as several scalar PDE's, where you will not have curl operator.
Hi, In COMSOL vectorial PDE's cannot be input directly. You need to rewrite it as several scalar PDE's, where you will not have curl operator.
Jan
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Posted: 1 decade ago 2012年9月1日 GMT-4 13:40
Thank you very much for the answer.

I guess this is something that could be improved/added in the future?
Thank you very much for the answer. I guess this is something that could be improved/added in the future?
Shoval Zoran
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Posted: 1 decade ago 2012年9月2日 GMT-4 08:21
You can also see that by toggling on 'equation view' in the options to the right of the model builder. Then, you can see the equations, and with any one that has a curl operator you will see how it is described.
You can also see that by toggling on 'equation view' in the options to the right of the model builder. Then, you can see the equations, and with any one that has a curl operator you will see how it is described.

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