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# Re: [femm] Objects in uniform field

- To: femm@egroups.com
- Subject: Re: [femm] Objects in uniform field
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Fri, 27 Oct 2000 10:20:01 -0400
- Organization: Foster-Miller, Inc.
- References: <OFF79D77CB.D27A51EF-ON86256983.00701B6A@collins.rockwell.com>

    jmhannon@collins.rockwell.com wrote:

    > I am interested in visulizing the magnetic field in magnetic materials
    > immeresed in a large uniform field, such as a rod in the earth's magnetic
    > field. The instructions on setting up boundary conditions don't make it
    > clear if this can be done.
    >
    > Jim Hannon

    Yes, you can do this. For example, define your domain to be a rectangular
    region. Define the boundary condition to be A=0 on one edge of the box, and
    define A=B*w on the opposite edge, where B is the magnitude of the ambient
    uniform field, and w is the distance between the edges. This boundary
    condition imposes a field that is inform in the absence of permeable
    materials.

    I've attached an example of a rod with a hole in the center, and I've picked
    the boundary conditions to yield an ambient field of 0.00005 Tesla --
    approximately the same as the Earth's magnetic field.

    Dave.

Attachment: `zip00005.zip`
Description: Zip compressed data

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    org:Foster-Miller, Inc.;Electrical and Electronic Systems Group
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    title:Senior Engineer
    adr;quoted-printable:;;350 Second Avenue=0D=0A;Waltham;MA;02451-1196;USA
    fn:David Meeker, Ph.D.
    end:vcard

- References:
  - Objects in uniform field
    - From: <jmhannon@collins.rockwell.com>

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