Volume 14, Issue 1
Cohomology in 3D Magneto-Quasistatics Modeling

Pawel Dlotko and Ruben Specogna

10.4208/cicp.151111.180712a

Commun. Comput. Phys., 14 (2013), pp. 48-76.

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  • Abstract

Electromagnetic modeling provides an interesting context to present a link between physical phenomena and homology and cohomology theories. Over the past twenty-five years, a considerable effort has been invested by the computational electromagnetics community to develop fast and general techniques for defining potentials. When magneto-quasi-static discrete formulations based on magnetic scalar potential areemployed inproblemswhich involve conductive regions withholes, cutsare needed to make the boundary value problem well defined. While an intimate connection with homology theory has been quickly recognized, heuristic definitions of cuts are surprisingly still dominant in the literature. The aim of this paper is first to survey several definitions of cuts together with their shortcomings. Then, cuts are defined as generators of the first cohomology group over integers of a finite CW-complex. This provably general definition has also the virtue of providing an automatic, general and efficient algorithm for the computation of cuts. Some counter-examples show that heuristic definitions of cuts should be abandoned. Theuseofcohomology theoryis notanoptionbuttheinvaluabletool expresslyneeded to solve this problem.


  • History

Published online: 2014-07

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