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Accurate fast computation of steady two-dimensional surface gravity waves in arbitrary depth

Published online by Cambridge University Press:  06 April 2018

Didier Clamond Open the ORCID record for Didier Clamond [Opens in a new window]  and
Denys Dutykh
Didier Clamond*
Affiliation:
Université Côte d’Azur, CNRS-LJAD UMR 7351, Parc Valrose, F-06108 Nice, France
Denys Dutykh
Affiliation:
Université Savoie Mont Blanc, CNRS-LAMA UMR 5127, Campus Scientifique, F-73376 Le Bourget-du-Lac, France
*
†Email address for correspondence: didierc@unice.fr
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Abstract

This paper describes an efficient algorithm for computing steady two-dimensional surface gravity waves in irrotational motion. The algorithm complexity is $O(N\log N)$, $N$ being the number of Fourier modes. This feature allows the arbitrary precision computation of waves in arbitrary depth, i.e. it works efficiently for Stokes, cnoidal and solitary waves, even for quite large steepnesses, up to approximately 99 % of the maximum steepness for all wavelengths. In particular, the possibility to compute very long (cnoidal) waves accurately is a feature not shared by other algorithms and asymptotic expansions. The method is based on conformal mapping, the Babenko equation rewritten in a suitable way, the pseudo-spectral method and Petviashvili iterations. The efficiency of the algorithm is illustrated via some relevant numerical examples. The code is open source, so interested readers can easily check the claims, use and modify the algorithm.

JFM classification

Mathematical Foundations: Computational methods Waves/Free-surface Flows: Surface gravity waves
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 844 , 10 June 2018 , pp. 491 - 518
Copyright
© 2018 Cambridge University Press 

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