A Semi Matrix-Free Twogrid Preconditioner for the Helmholtz Equation with Near Optimal Shifts

Daniel Drzisga, Tobias Köppl, Barbara I. Wohlmuth. A Semi Matrix-Free Twogrid Preconditioner for the Helmholtz Equation with Near Optimal Shifts. J. Sci. Comput., 95(3):82, June 2023. [doi]

Abstract

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