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arXiv · 2312.06367

A stabilized time-domain combined field integral equation using the quasi-Helmholtz projectors

Van Chien Le·Pierrick Cordel·Francesco P. Andriulli·Kristof Cools
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Abstract

This paper introduces a time-domain combined field integral equation for electromagnetic scattering by a perfect electric conductor. The new equation is obtained by leveraging the quasi-Helmholtz projectors, which separate both the unknown and the source fields into solenoidal and irrotational components. These two components are then appropriately rescaled to cure the solution from a loss of accuracy occurring when the time step is large. Yukawa-type integral operators of a purely imaginary wave number are also used as a Calderon preconditioner to eliminate the ill-conditioning of matrix systems. The stabilized time-domain electric and magnetic field integral equations are linearly combined in a Calderon-like fashion, then temporally discretized using an appropriate pair of trial functions, resulting in a marching-on-in-time linear system. The novel formulation is immune to spurious resonances, dense discretization breakdown, large-time step breakdown and dc instabilities stemming from non-trivial kernels. Numerical results for both simply-connected and multiply-connected scatterers corroborate the theoretical analysis.

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Van Chien Le, Pierrick Cordel, Francesco P. Andriulli, Kristof Cools. 2023-12-11. A stabilized time-domain combined field integral equation using the quasi-Helmholtz projectors. https://arxiv.org/abs/2312.06367

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