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Electric field just above an interface

Posted Apr 4, 2014, 12:13 p.m. EDT Results & Visualization, Studies & Solvers Version 4.3b, Version 4.4 5 Replies

dnh37

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I apply a static electric field across a 2D air gap.

Somewhere in the air gal I place a square dielectric. I notice the solved E field is discontinuous at the air-dielectric interface. So it's a different value just inside and just outside the dielectric.

Now I want to plot the E field along one of the edges of the dielectric, just inside or just outside it. I could draw another slightly larger or smaller box around it, and plot E along the edge of this new box, but that tends to mess up my meshing, and I won't get the true boundary values that way. Is there a better way?

5 Replies Last Post Apr 15, 2014, 1:53 p.m. EDT

Pu

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Posted: 1 decade ago

There's operator in COMSOL to evaluate variables on a specific side of a boundary.

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Pu, ZHANG
DTU Fotonik

dnh37

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Posted: 1 decade ago

Thanks. Can you tell me what the operator is? I did some google searching just now but I'm not finding it.

Edgar J. Kaiser Certified Consultant

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Posted: 1 decade ago

I would recommend to search in the COMSOL documentation.

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com

dnh37

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Posted: 1 decade ago

Hm, I'm still not finding it. Not sure what to search for..

"evaluate variable on side of boundary"
"plot one side of boundary"
"COMSOL operator to evaluate variables on a specific side of a boundary"
...?

These search terms are returning too many false positives.. Can you please tell me the operator name so I can go straight to it?

Jeff Hiller COMSOL Employee

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Posted: 1 decade ago

I think they are thinking of the "up" and "down" operators, see the Reference Manual's section on built-in operators (page 209 and following in version 4.4 of that manual).
Jeff

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