On the condition ‘h normal to the wall’ in magnetic field problems

1 August 1987

journal article
research article
Published by Wiley in International Journal for Numerical Methods in Engineering

Vol. 24 (8) , 1541-1550
https://doi.org/10.1002/nme.1620240810

Abstract

In finite element computations of magnetic fields, the boundary condition n × h = 0 is usually enforced on walls made of a material ofgreat permeability. We purport here to question the validity of this approximation. It is shown how this condition stems from a suitable passage to the limit (when the ratio of permeabilities μ₀/μ tends to zero), provided a condition of topological nature (‘no loops’) is fulfilled. What to do when this condition does not hold is discussed.

Keywords

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