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Capacitance of plate capacitor

Posted Sep 21, 2010, 5:30 a.m. EDT 2 Replies

Davor Lovric

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Hi

I wonder what the expression:

unr*(down(es.Dr)-up(es.Dr))+unz*(down(es.Dz)-up(es.Dz))

means. I use this expression to calculate the capacitance of the plate capacitor. I use 2D-axial symmetry and integrate over one of the plates. Specially i wonder what "up" and "down" in this expression means.

Thanks!

2 Replies Last Post Jun 5, 2015, 3:11 p.m. EDT

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

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Posted: 1 decade ago

Hi

check your doc, "up" and "down" are the two sides of a boundary when you have some special physics on teh boundary that means that the gradients are NOT continuous over the boundary. it is to distinguis the "two sides" of a boundary normal

--
Good luck
Ivar

Syarif Husein

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Posted: 10 years ago

Hi

Can you please let me know where can I find that expression on COMSOL?
I am looking for the computation techniques that COMSOL use.

Thanks
Syarif

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Capacitance of plate capacitor

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