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High-order Galerkin method for Helmholtz and Laplace problems on multiple open arcs
prof. Carlos Jerez-Hanckes - Pontificia Universidad Catolica de Chile
Sala conferenze IMATI-CNR, Pavia - Martedì 23 Ottobre 2018 h.15:00
Abstract. We present a spectral numerical scheme for solving Helmholtz and Laplace problems with Dirichlet boundary conditions on a finite collection of open arcs in $R^2$. An indirect boundary integral method is employed, giving rise to a first kind formulation whose variational form is discretized using weighted Chebyshev polynomials.
Well-posedness of both continuous and discrete problems is established as well as spectral convergence rates under the existence of analytic maps to describe the arcs. In order to reduce computation times, a simple matrix compression technique based on sparse kernel approximations is developed. Numerical results provided validate our claims.
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