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Basic Parallel Plate Capacitor 3.5a - Integration Error

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Hello,

I am trying to create a very simple model to test the integration tools in COMSOL 3.5 (I have 4.1 as well but the lack of perfect electric insulation in AD/DC mode makes this program less accessible - if this is possible, please let me know).

I have created a simple rectangle with dimensions of 1m x 1m x 1m and have placed a constant potential of 1V on one edge and a ground on the other. The remaining two parallel sides are electric insulation. Finally, the subdomain has been set as "air" so that the permittivity is e0.

When I solve this geometry and try to perform a normal current density boundary integral on either of the conductive boundaries, I am off by a factor of 100*pi.

Any insight or suggestions would be helpful,

Patrick


1 Reply Last Post 19.04.2011, 10:59 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 19.04.2011, 10:59 GMT-4
Hi

You have an application mode with electric currents, but your "air" domain has "0" conductivity. I would not expect a large current then if you integrate over whatever area. And edges/boundaries inherit from the domains.

then why does 4.1 work, for me it has more options than 3.5 by now ?

--
Good luck
Ivar
Hi You have an application mode with electric currents, but your "air" domain has "0" conductivity. I would not expect a large current then if you integrate over whatever area. And edges/boundaries inherit from the domains. then why does 4.1 work, for me it has more options than 3.5 by now ? -- Good luck Ivar

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