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On the Accuracy and Stability of the Perfectly Matched Layer in Transient Waveguides

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Abstract

Energy transmitted along a waveguide decays less rapidly than in an unbounded medium. In this paper we study the efficiency of a PML in a time-dependent waveguide governed by the scalar wave equation. A straight forward application of a Neumann boundary condition can degrade accuracy in computations. To ensure accuracy, we propose extensions of the boundary condition to an auxiliary variable in the PML. We also present analysis proving stability of the constant coefficient PML, and energy estimates for the variable coefficients case. In the discrete setting, the modified boundary conditions are crucial in deriving discrete energy estimates analogous to the continuous energy estimates. Numerical stability and convergence of our numerical method follows. Finally we give a number of numerical examples, illustrating the stability of the layer and the high order accuracy of our proposed boundary conditions.

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Authors and Affiliations

  1. Division of Scientific Computing, Department of Information Technology, Uppsala University, Uppsala, Sweden

    Kenneth Duru & Gunilla Kreiss

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  1. Kenneth Duru
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  2. Gunilla Kreiss
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Correspondence to Kenneth Duru.

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Duru, K., Kreiss, G. On the Accuracy and Stability of the Perfectly Matched Layer in Transient Waveguides. J Sci Comput 53, 642–671 (2012). https://doi.org/10.1007/s10915-012-9594-7

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  • DOI: https://doi.org/10.1007/s10915-012-9594-7

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