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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

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Grassmannian spectral shooting
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by Veerle Ledoux, Simon J. A. Malham and Vera Thümmler PDF
Math. Comp. 79 (2010), 1585-1619 Request permission

Abstract:

We present a new numerical method for computing the pure-point spectrum associated with the linear stability of coherent structures. In the context of the Evans function shooting and matching approach, all the relevant information is carried by the flow projected onto the underlying Grassmann manifold. We show how to numerically construct this projected flow in a stable and robust manner. In particular, the method avoids representation singularities by, in practice, choosing the best coordinate patch representation for the flow as it evolves. The method is analytic in the spectral parameter and of complexity bounded by the order of the spectral problem cubed. For large systems it represents a competitive method to those recently developed that are based on continuous orthogonalization. We demonstrate this by comparing the two methods in three applications: Boussinesq solitary waves, autocatalytic travelling waves and the Ekman boundary layer.
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Additional Information
  • Veerle Ledoux
  • Affiliation: Vakgroep Toegepaste Wiskunde en Informatica, Ghent University, Krijgslaan, 281-S9, B-9000 Gent, Belgium
  • Simon J. A. Malham
  • Affiliation: Department of Mathematics, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • Vera Thümmler
  • Affiliation: Fakultät für Mathematik, Universität Bielefeld, 33501 Bielefeld, Germany
  • Received by editor(s): September 3, 2008
  • Received by editor(s) in revised form: July 6, 2009
  • Published electronically: January 25, 2010
  • © Copyright 2010 American Mathematical Society
    The copyright for this article reverts to public domain 28 years after publication.
  • Journal: Math. Comp. 79 (2010), 1585-1619
  • MSC (2010): Primary 65L15, 65L10
  • DOI: https://doi.org/10.1090/S0025-5718-10-02323-9
  • MathSciNet review: 2630004