Optimized schwarz methods for Maxwell equations with discontinuous coefficients

Dolean, Victorita and Gander, Martin J. and Veneros, Erwin; Erhel, Jocelyne and Gander, Martin J. and Halpern, Laurence and Pichot, Géraldine and Sassi, Taoufik and Widlund, Olof, eds. (2014) Optimized schwarz methods for Maxwell equations with discontinuous coefficients. In: Domain Decomposition Methods in Science and Engineering XXI. Lecture Notes in Computational Science and Engineering . Springer, FRA, pp. 517-525. ISBN 9783319057897

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    We study non-overlapping Schwarz methods for solving time-harmonic Maxwell’s equations in heterogeneous media. We show that the classical Schwarz algorithm is always divergent when coefficient jumps are present along the interface. In the case of transverse magnetic or transverse electric two dimensional formulations, convergence can be achieved in specific configurations only. We then develop optimized Schwarz methods which can take coefficient jumps into account in their transmission conditions. These methods exhibit rapid convergence, and sometimes converge independently of the mesh parameter, even without overlap. We illustrate our analysis with numerical experiments.