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# Re: [femm] Neumann boundary condition

- To: femm@yahoogroups.com
- Subject: Re: [femm] Neumann boundary condition
- From: dcm3c@aol.com
- Date: Thu, 15 Nov 2001 14:03:32 EST

In a message dated 11/14/01 3:40:32 AM Eastern Standard Time, sh9988@mail.hz.zj.cn writes:

> Dear David and All,
> I have encountered a mixed boundary condition (see below) along the
> outer boundary of domain in a 2D time harmonic simulation.
> Ht = Jm * exp(-jPhi * x)
> Where Jm is the line density of Current, Phi is the phase angle
> and it is a function of x-coordinate.
> This condition can't be set directly to the boundary with the Mixed
> boundary condition in FEMM. The only way I have thought is to split
> the boundary into many small segments. Then manually calculate the
> values on each segment's midpoint, set each segment's condition with
> its midpoint's value.
> Apparently, it's not a good way and cause a lot of work. Is there a
> better way or we can add the feature that support Mixed boundary
> condition with a function of coordinates(like the Prescribed A
> condition)?
> Best regards
> Si hang

This is probably something that would be good to include as an extra boundary condition type or something. I end up wanting to do this sort of thing occasionally as well (especially to sanity-check analytical results that I come up with), but I haven't gotten around to writing it in yet. For the moment, a number of different boundary conditions associated with different current sheet amplitudes is the only way to go.
Dave.
--
David Meeker
http://members.aol.com/_ht_a/dcm3c

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