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The instability of periodic surface gravity waves

Published online by Cambridge University Press:  17 March 2011

BERNARD DECONINCK  and
KATIE OLIVERAS
BERNARD DECONINCK*
Affiliation:
Department of Applied Mathematics, University of Washington, Seattle, WA 98195-2420, USA
KATIE OLIVERAS
Affiliation:
Mathematics Department, Seattle University, Seattle, WA 98122-1090, USA
*
†Email address for correspondence: bernard@amath.washington.edu
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Abstract

Euler's equations describe the dynamics of gravity waves on the surface of an ideal fluid with arbitrary depth. In this paper, we discuss the stability of periodic travelling wave solutions to the full set of nonlinear equations via a non-local formulation of the water wave problem, modified from that of Ablowitz, Fokas & Musslimani (J. Fluid Mech., vol. 562, 2006, p. 313), restricted to a one-dimensional surface. Transforming the non-local formulation to a travelling coordinate frame, we obtain a new formulation for the stationary solutions in the travelling reference frame as a single equation for the surface in physical coordinates. We demonstrate that this equation can be used to numerically determine non-trivial travelling wave solutions by exploiting the bifurcation structure of this new equation. Specifically, we use the continuous dependence of the amplitude of the solutions on their propagation speed. Finally, we numerically examine the spectral stability of the periodic travelling wave solutions by extending Fourier–Floquet analysis to apply to the associated linear non-local problem. In addition to presenting the full spectrum of this linear stability problem, we recover past well-known results such as the Benjamin–Feir instability for waves in deep water. In shallow water, we find different instabilities. These shallow water instabilities are critically related to the wavelength of the perturbation and are difficult to find numerically. To address this problem, we propose a strategy to estimate a priori the location in the complex plane of the eigenvalues associated with the instability.

JFM classification

Instability: Instability Waves/Free-surface Flows: Surface gravity waves

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 675 , 25 May 2011 , pp. 141 - 167
Copyright
Copyright © Cambridge University Press 2011

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