An improved two-grid preconditioner for the solution of three-dimensional Helmholtz problems in heterogeneous media


In this paper we address the solution of three-dimensional heterogeneous Helmholtz problems discretized with second-order finite difference methods with application to acoustic waveform inversion in geophysics. In this setting, the numerical simulation of wave propagation phenomena requires the approximate solution of possibly very large indefinite linear… (More)
DOI: 10.1002/nla.1860


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