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# New beta version

- To: femm@yahoogroups.com
- Subject: New beta version
- From: dcm3c@aol.com
- Date: Thu, 8 Mar 2001 17:39:15 EST

    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

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