jmhannon@xxxxxxxxxxxxxxxxxxxx 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.
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