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High-frequency instabilities of Stokes waves

Published online by Cambridge University Press:  28 February 2022

Ryan P. Creedon*
Affiliation:
Department of Applied Mathematics, University of Washington, Seattle, WA98195, USA
Bernard Deconinck
Affiliation:
Department of Applied Mathematics, University of Washington, Seattle, WA98195, USA
Olga Trichtchenko
Affiliation:
Department of Physics and Astronomy, The University of Western Ontario, London, ONN6A 3K7, Canada
*
Email address for correspondence: creedon@uw.edu

Abstract

Euler's equations govern the behaviour of gravity waves on the surface of an incompressible, inviscid and irrotational fluid of arbitrary depth. We investigate the spectral stability of sufficiently small-amplitude, one-dimensional Stokes waves, i.e. periodic gravity waves of permanent form and constant velocity, in both finite and infinite depth. We develop a perturbation method to describe the first few high-frequency instabilities away from the origin, present in the spectrum of the linearization about the small-amplitude Stokes waves. Asymptotic and numerical computations of these instabilities are compared for the first time, with excellent agreement.

Type
JFM Papers
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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