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How do I compare the voltage difference of 2 boundaries with respect to the position along it?
Posted 26 avr. 2016, 21:03 UTC−4 Low-Frequency Electromagnetics, Geometry, Parameters, Variables, & Functions, Studies & Solvers Version 4.3 3 Replies
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Im am trying to replicate the study attached that was performed at a COMSOL conference but i have ran into complications. (The file is attached below)
I don't understand how to get the voltage difference between 2 points on a boundary. These 2 points must be a part of the boundary (but not specifically defined) and the voltage differential I want to get has to lie directly across from it.
So say I'm working the 2D axial symmetrical plane and have a boundary at r .5 and another at .505. These lie directly across from each other and have the same dimension in z. Using an electrostatics module (or electric current) I apply a voltage to my structure and wish to know the difference in voltage in relation to the z component.
Please let me know if you have any ideas on how I should go about solving this. The paper says that I should use extrusion but I am not clear on how. I have read many different threads and COMSOL examples and still don't fully understand how to use it. I tried using the boundary probe but this did not seem helpful.
Note: I believe this paper has some mistakes in the writing.
Regards,
Stephen
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I believe the authors of this paper are referring to Component Couplings of the Extrusion type. See COMSOL Multiphysics Reference Manual, version 5.2, page 281 and following.
Best,
Jeff
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Firstly thank you for responding to my question. I am using student version 4.3 of COMSOL and do not have access to 5.2 . This paper was written in 2009 so I am assuming they did not use a version of COMSOL newer than 4.3 . Thank you again for your help.
Regards,
Stephen Gibellini
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Best,
Jeff
PS: In case you communicate with the authors, and if they used a version prior to 4.0, the equivalent concept was called "extrusion coupling variables" back then. It was the same general capability but a bit tedious to use in some cases compared to what we have now, because you needed to create a separate extrusion coupling variable for each quantity you wanted to extrude, whereas now you can create a single operator and apply it with various arguments.