Numerical homogenization for indefinite H(curl)-problems
It provides a method for solving indefinite Maxwell problems with rough coefficients, which is important for computational electromagnetics.
The paper extends a numerical homogenization scheme for H(curl)-problems to indefinite, time-harmonic Maxwell's equations with rough coefficients, achieving order-optimal error estimates.
In this paper, we present a numerical homogenization scheme for indefinite, time-harmonic Maxwell's equations involving potentially rough (rapidly oscillating) coefficients. The method involves an $\mathbf{H}(\mathrm{curl})$-stable, quasi-local operator, which allows for a correction of coarse finite element functions such that order optimal (w.r.t. the mesh size) error estimates are obtained. To that end, we extend the procedure of [D. Gallistl, P. Henning, B. Verfürth, Numerical homogenization of H(curl)-problems, arXiv:1706.02966, 2017] to the case of indefinite problems. In particular, this requires a careful analysis of the well-posedness of the corrector problems as well as the numerical homogenization scheme.