Re: simple femm, feed back appreciated.

["David Meeker <dmeeker@xxxxxxxx>" <dmeeker@xxxxxxxx>]

--- In femm@xxxxxxxxxxxxxxx, Keith Gregory <k.gregory@xxxx> wrote:
> The Kelvin Transformation form though I think could be
> put anywhere because it represents the "far field" explicitly
> (am I right here Dave?). It has to be circular though, I think.

Yes, that's right. The boundaries can abut your parts if you use the
Kelvin Transformation. And looking at the solution in the circle
representing the external region, you can back out the flux density at
any point in space.

Although I've only applied this type of boundary condition to circular
boundaries, it might be possible to look at more general boundaries.
I've just fished up the paper:

A. Stochniol, "A general transformation for open boundary finite
element method for electromagnetic problems," IEEE Trans. Mag.,
28(2):1679-1681, March 1992.

which appears to describe how to do this. I'll have to check it out
in more detail.

As an aside, an interesting overview of the topic of open boundary
problems is:

Q. Chen and A. Konrad, "A review of finite element open boundary
techniques for static and quasi-static electromagnetic field
problems," IEEE Trans. Mag., 33(1):663-676, Jan. 1997.

Dave.
--
http://femm.berlios.de/dmeeker