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# electrostatics and FEMM

- To: femm@yahoogroups.com
- Subject: electrostatics and FEMM
- From: frank.e.lenning@boeing.com
- Date: Mon, 04 Jun 2001 22:51:27 -0000
- User-agent: eGroups-EW/0.82

    I've been playing a little trying to do electrostatics problems within
    FEMM in a similar way suggested by Roberto Brambilla in message 180.
    After some thought, though, I can't figure out why you can't do
    axisymmetric electrostatic in FEMM. It seems like both satisfy a
    Poisson's equation and so you should be able to equate the proper
    quantities to do it.

    Trying this out though I have run into some subtle problems with the
    way FEMM handles axisymmetric. First, I can't seem to be able to set
    A on a boundary internal to a problem space. I have tried prescibing
    A on a boundary and I get something that looks more like FEMM has set
    A/r to some constant (when I set A0=1). Second, FEMM seems to default
    the axis of symmetry boundary to A=0 and will not allow me to change
    it. For axisymmetric electrostatics problems, I'd like to set dV/dn
    to zero along this boundary but it doesn't seem to let me. The
    specific problem I'm trying to do is two cylindrical conductors
    (aligned end-on on the r=0 axis) of finite length at opposite
    potentials. Any suggestions??

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