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# Re: [femm] Meaning of flux lines?

- To: femm@egroups.com
- Subject: Re: [femm] Meaning of flux lines?
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Fri, 01 Sep 2000 09:32:09 -0400
- Organization: Foster-Miller, Inc.
- References: <8ompnr+jasv@eGroups.com>

    peter.ceelen@ct.boc.com wrote:

    > The meaning and interpretation of the flux lines displayed in
    > femmview is not clear to me. Do these lines represent some
    > equipotential (if I follow a line does some value remain constant)?
    > How is the number of lines related to some numeric value (in other
    > words what is the difference in value between any two given lines at
    > a particular number of lines)? Thanks in advance for your help.

    The lines are paths along which the flux flows, like streamlines in a fluid
    flow.

    In planar problems, the flux lines are equipotentials of magnetic vector
    potential (denoted A), and the difference in A between two flux lines equals
    the amount of flux that flows in the section between the two lines. Since
    femm plots the flux lines at even intervals of A from its minimum to maximum
    value, you can interpret the distance between flux lines as an indication of
    flux density.

    For axisymetric problems, the situation is similar, though there are subtle
    differences. For axisymmetric problems, level contours of 2*Pi*r*A (denoted
    "Flux" in the axisymmetric point properties output) are plotted, where r is
    the radius from the centerline. Plotting this quantity still gives lines
    that are tangential to the flow of flux (i.e. the lines are still flux
    streamlines), and the difference in Flux between two points is still the
    amount of flux flowing through the section between the two points. In
    axisymmetric problems, however, the interpretation of distance between flux
    lines as an indication of flux density doesn't apply, because a given amount
    of flux translates to different flux densities at different radii. To
    graphically display flux density in axisymmetric problems, you can always
    turn on the density plot that displays different flux levels as different
    colors on the screen.

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

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- References:
  - Meaning of flux lines?
    - From: peter.ceelen@ct.boc.com

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