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# Question in Axisym. Problems in Postprocessor

- To: femm@yahoogroups.com
- Subject: Question in Axisym. Problems in Postprocessor
- From: stsc_sh@sina.com
- Date: Tue, 13 Mar 2001 09:20:39 -0000
- User-agent: eGroups-EW/0.82

    David:
    First of all, thanks for providing the FEMM program and it's source
    code. It's really help me a lot and save many times for me in my work
    in solving 2D electro-magnetic problems.
    Could you give me a more detail description on how to interpolate
    the potential in axi case. And how to get element's B value where it
    is near the axi and the equations you used(because I can't got the
    references you listed in the User Mannual). Thank you.

    Anyway here are two suggestions that maybe help FEMM get more
    efficient in use:
    (1) In postprocessor view you can try to use the virtual window
    replace redraw the window. Just use win32 API function BitBlt() after
    draw all items in the window. In WM_PAINT message handler use BitBlt
    () again to restore the items without addtional job. This will avoid
    a long wating time while redraw the windows.
    (2) In postprocessor Line Integral. It will take a long time when I
    try to get a Force or Torgue result from a contour when the mesh size
    is big. I think it was a point loction problem. There have some
    algorithms for efficient point location[1][2]. If possible, I can
    write a function for you for FEMM to solve the efficient point
    loction problem.

    [1] E.P.Mucke, Isaac Saias, Binhai Zhu, Fast Randomized Point
    Location Without Preprocessing in Two- and Three-dimension Delaunay
    Triangulations. In Proceedings of the 12th Annual Symposium on
    Computational Geometry,1996.
    [2] L.J.Guibas abd J.Stolfi. Primitives for the Manipulation of
    General Subdivisions and the Computation of Voronoi Diagrams.
    Transactions on Graphics,4(2):74-123.

    si hang

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