Journal
SIAM REVIEW
Volume 58, Issue 1, Pages 90-116Publisher
SIAM PUBLICATIONS
DOI: 10.1137/140966927
Keywords
Helmholtz equation; Neumann-to-Dirichlet map; perfectly matched layer; rational approximation; Zolotarev problem; continued fraction
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A new construction of an absorbing boundary condition for indefinite Helmholtz problems on unbounded domains is presented. This construction is based on a near-best uniform rational interpolant of the inverse square root function on the union of a negative and a positive real interval, designed with the help of a classical result by Zolotarev. Using Krein's interpretation of a Stieltjes continued fraction, this interpolant can be converted into a three-term finite difference discretization of a perfectly matched layer which converges exponentially fast in the number of grid points. The convergence rate is asymptotically optimal for both propagative and evanescent wave modes. Several numerical experiments and illustrations are included.
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