Weighted integral solvers for elastic scattering by open arcs in two dimensions
For researchers in computational wave scattering, this provides an efficient solver for open-arc elastic scattering, though the key Calderón relation lacks rigorous proof.
The paper introduces a novel numerical method for solving elastic scattering problems by open arcs in 2D, achieving high accuracy with few GMRES iterations for both low and high frequencies.
We present a novel approach for the numerical solution of problems of elastic scattering by open arcs in two dimensions. Our methodology relies on the composition of weighted versions of the classical operators associated with Dirichlet and Neumann boundary conditions in conjunction with a certain "open-arc elastic Calderón relation" whose validity is demonstrated in this paper on the basis of numerical experiments, but whose rigorous mathematical proof is left for future work. Using this Calderón relation in conjunction with spectrally accurate quadrature rules and the Krylov-subspace linear algebra solver GMRES, the proposed overall open-arc elastic solver produces results of high accuracy in small number of iterations---for low and high frequencies alike. A variety of numerical examples in this paper demonstrate the accuracy and efficiency of the proposed methodology.