Abstract
Electromagnetic fields are present wherever sources of currents are found. Conventional shielding against these electromagnetic fields is accomplished by using com plete ferromagnetic enclosures. Maxwell's equations govern the phenomenon of electro magnetic fields in discontinuous media, and analytical solutions in the presence of enclo sures of arbitrary shapes are not available. Hence, Maxwell's equations are solved numerically using the finite element method in conjunction with the magnetic scalar potential approach. The test case for the verification of the numerical code is a long cylin drical ferromagnetic shell placed in a transverse uniform magnetic field for which an ana lytical solution is derived here. The comparison of analytical and numerical solutions vali dates the accuracy of the numerical code. As expected the magnetic field inside the complete enclosure varies inversely to the relative permeability of the enclosure. Using this approach, enclosures of different shapes can be designed.
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