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# Re: [femm] New beta version

- To: femm@yahoogroups.com
- Subject: Re: [femm] New beta version
- From: Keith Gregory <k.gregory@lboro.ac.uk>
- Date: Fri, 09 Mar 2001 14:14:03 +0000
- In-reply-to: <f2.821ab31.27d96413@aol.com>

`David,`
`I downloaded and installed your new beta 4 but it doesn't seem to be any different, it doesn't seem to be reading the colours file and the new boundary types are not in the BC list. Am I doing something wrong or not doing something that I should be?`
`Keith.`
`PS I liked the mesh in yellow.`
`At 17:39 08/03/01 -0500, you wrote:`

> `All--`

>     I've put up a new beta version of femm 3.0 in the "files" section of the
>     mailing list website at:
>     http://groups.yahoo.com/group/femm/files/
>     I'd be interested in feedback/bug reports, especially with respect to the new
>     functionality that has been implemented.

>     The most significant change to this version is the addition of periodic and
>     antiperiodic boundary conditions. This was sort of the last "big" feature
>     that I wanted to put into the 3.0 version before making it a "release" rather
>     than a "beta." One uses this sort of boundary condition by choosing
>     "Periodic" or "Antiperiodic" in the "BC Types" drop list in the boundary
>     property dialog. Each defined periodic boundary condition should be applied
>     to two and only two segments or arc segments that are meant to be connected
>     periodically. If there are multiple pairs of segments or arcs, you have to
>     define multiple boundary conditions.

>     Anyhow, I have also posted a zip file containing two examples that employ
>     periodic and antiperiodic boundary conditions. One sample is the switched
>     reluctance motor pictured at:
>     http://www.elec.gla.ac.uk/groups/speed/software/feashot.html
>     Just as on this web page, periodic boundary conditions have been applied so
>     that only part of the motor need be modeled.
>     The second example I have taken from the paper,
>     Lowther, D.A., Freeman, E.M., and Forghani, B., "A sparse matrix open
>     boundary method for finite element analysis," IEEE Transactions on Magnetics
>     , 25(4):2810-2812, July 1989.
>     This is an example of a pretty slick way that one can go about modeling open
>     boundary problems through the use of periodic boundary conditions. There are
>     also a couple of other interesting papers in Trans. Mag. by the Infolytica
>     guys that explore other aspects of this open boundary approach.

>     Anyhow, I the implementation of the periodic and antiperiodic boundary
>     conditions seems to run ok, but there could be bugs that pop up due to other
>     people testing it in ways that I might not have considered. It turned out
>     that there were a lot more subtleties in implementing these boundary
>     conditions than one might think, so there is certainly the possibility of
>     bugs. One thing that is different about these bcs (but not a bug) is that
>     triangle gets called twice during the meshing of problems with pbcs and apbcs.

>     I also modified the program so that it looks at a file called "colors.dat"
>     that lives in the femm30\bin directory for definitions of the colors used in
>     the various modules of femm. A femm user who is colorblind turned me on to
>     the necessity of being able to modify the color scheme that femm uses. And
>     it seems like nobody but me likes the mesh rendered in yellow.... Anyhow,
>     this is a text file, and you change around the colors by editing it with
>     notepad or whatever.

>     This version also has a manual that has been partially updated to 3.0 from
>     2.1a, but there's still quite a bit of work left on the documentation.

>     Dave Meeker
>     --
>     http://members.aol.com/dcm3c

> ``
> `Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/`

    Keith Gregory
    Department of Electronic & Electrical Engineering
    Loughborough University
    Phone: 01509 227025 Fax: 01509 227014
    Department web: http://www.lboro.ac.uk/departments/el/

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