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A Compact Fourth Order Scheme for the Helmholtz Equation in Polar Coordinates

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Abstract

In many problems, one wishes to solve the Helmholtz equation in cylindrical or spherical coordinates which introduces variable coefficients within the differentiated terms. Fourth order accurate methods are desirable to reduce pollution and dispersion errors and so alleviate the points-per-wavelength constraint. However, the variable coefficients renders existing fourth order finite difference methods inapplicable. We develop a new compact scheme that is provably fourth order accurate even for these problems. The resulting system of finite difference equations is solved by a separation of variables technique based on the FFT. Moreover, in the r direction the unbounded domain is replaced by a finite domain, and an exact artificial boundary condition is specified as a closure. This global boundary condition fits naturally into the inversion of the linear system. We present numerical results that corroborate the fourth order convergence rate for several scattering problems.

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Authors and Affiliations

  1. Department of Mathematics, North Carolina State University, Box 8205, Raleigh, NC, 27695, USA

    S. Britt & S. Tsynkov

  2. School of Mathematical Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv, 69978, Israel

    E. Turkel

Authors
  1. S. Britt
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  2. S. Tsynkov
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  3. E. Turkel
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Correspondence to S. Tsynkov.

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Dedicated to the memory of our dear friend, David Gottlieb.

This work was partially supported by the United States—Israel Binational Science Foundation (BSF), grant number 2008094. Research of the first and second authors was also supported in part by the US Air Force, grant number FA9550-07-1-0170, and US NSF, grant number DMS-0509695.

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Britt, S., Tsynkov, S. & Turkel, E. A Compact Fourth Order Scheme for the Helmholtz Equation in Polar Coordinates. J Sci Comput 45, 26–47 (2010). https://doi.org/10.1007/s10915-010-9348-3

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  • DOI: https://doi.org/10.1007/s10915-010-9348-3

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