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Time-domain surface impedance boundary conditions enhanced by coarse volume finite-element discretisation

par Sabariego, Ruth;Geuzaine, Christophe;Dular, Patrick;Gyselinck, Johan
Référence IEEE transactions on magnetics, 48, 2, page (631-634), 6136746
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

In computational magnetodynamics, surface impedance boundary conditions allow to accurately account for high-frequency flux components while removing the massive conducting regions from the computation domain. The time-domain approach previously proposed by the authors relies on the spatial discretisation of a 1-D eddy-current problem by means of dedicated basis functions derived from the analytical frequency-domain solution. In this paper, these time-domain impedance conditions are combined with a coarse volume finite-element discretisation of the massive conductors to capture slowly varying flux components. The accuracy of the hybrid approach can further be improved by introducing a fictitious frequency-dependent conductivity. The method is illustrated and validated by means of 1-D and 2-D test cases in the frequency and time domain. © 2012 IEEE.