Year: 2012
Communications in Computational Physics, Vol. 11 (2012), Iss. 2 : pp. 415–434
Abstract
The Schrödinger equation defines the dynamics of quantum particles which has been an area of unabated interest in physics. We demonstrate how simple transformations of the Schrödinger equation leads to a coupled linear system, whereby each diagonal block is a high frequency Helmholtz problem. Based on this model, we derive indefinite Helmholtz model problems with strongly varying wavenumbers. We employ the iterative approach for their solution. In particular, we develop a preconditioner that has its spectrum restricted to a quadrant (of the complex plane) thereby making it easily invertible by multigrid methods with standard components. This multigrid preconditioner is used in conjunction with suitable Krylov-subspace methods for solving the indefinite Helmholtz model problems. The aim of this study is to report the feasibility of this preconditioner for the model problems. We compare this idea with the other prevalent preconditioning ideas, and discuss its merits. Results of numerical experiments are presented, which complement the proposed ideas, and show that this preconditioner may be used in an automatic setting.
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Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/cicp.121209.180910s
Communications in Computational Physics, Vol. 11 (2012), Iss. 2 : pp. 415–434
Published online: 2012-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 20
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Complex Additive Geometric Multilevel Solvers for Helmholtz Equations on Spacetrees
Reps, Bram
Weinzierl, Tobias
ACM Transactions on Mathematical Software, Vol. 44 (2018), Iss. 1 P.1
https://doi.org/10.1145/3054946 [Citations: 10]