New preconditioners for the Laplace and Helmholtz integral equations on open curves: analytical framework and numerical results
Résumé
Helmholtz wave scattering by open screens in 2D can be formulated as first-kind integral equations which lead to ill-conditioned linear systems after discretization. We introduce two new preconditioners in the form of square-roots of on-curve differential operators both for the Dirichlet and Neumann boundary conditions on the screen. They generalize the so-called “analytical” preconditioners available for Lipschitz scatterers. We introduce a functional setting adapted to the singularity of the problem and enabling the analysis of those preconditioners. The efficiency of the method is demonstrated on several numerical examples.
Domaines
Mathématiques [math]| Origine | Fichiers produits par l'(les) auteur(s) |
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