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tangential field components?

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Hello,

I have the following problem. I am modelling a 2D geometry (cross-section of a waveguide), and I need to compute Line integrals along a certain domain boundary of certain expressions which involve normal and tangential components of the field.

For instance, if I had a rectangular waveguide and wanted to compute the line integral of the normal component of electric field along one of the horizontal boundaries, I would simply use:

ewfd.Ey

as the expression under "Line Integration". This is a simple case, since Ey component is indeed normal to the boundary in this case.

However, in a more generic case (think for instance of a cylindrical waveguide), I can't just rely on Ex, Ey and Ez. Instead I would need to compute scalar product of the electric field vector (Ex,Ey,Ez) with the normal to the boundary unit vector.

Is there a smart way to do it in Comsol? I am sure there must be some embedded constants corresponding to different components of normal and tanjential vectors?

0 Replies Last Post Mar 15, 2017, 6:09 a.m. EDT
COMSOL Moderator

Hello Andriy Gorbach

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