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2 - High-Order Perturbation of Surfaces Short Course: Traveling Water Waves

Published online by Cambridge University Press:  05 February 2016

Benjamin F. Akers
Affiliation:
Air Force Institute of Technology
Thomas J. Bridges
Affiliation:
University of Surrey
Mark D. Groves
Affiliation:
Universität des Saarlandes, Saarbrücken, Germany
David P. Nicholls
Affiliation:
University of Illinois, Chicago
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Summary

Abstract

In this contribution we discuss High-Order Perturbation of Surfaces (HOPS) methods with particular application to traveling water waves. The Transformed Field Expansion method (TFE) is discussed as a method for handling the unknown fluid domain. The procedures for computing Stokes waves and Wilton Ripples are compared. The Lyapunov-Schmidt procedure for the Wilton Ripple is presented explicitly in a simple, weakly nonlinear model equation.

Introduction

Traveling water waves have been studied for over a century, most famously by Stokes, for whom weakly-nonlinear periodic waves are now named [1–3]. In his 1847 paper, Stokes expanded the wave profile as a power series in a small parameter, the wave slope, a technique that has since become commonplace. This classic perturbation expansion, which we will refer to as the Stokes’ expansion, has been applied to the water wave problem numerous times [4–9]. When the effect of surface tension is included, the expansion may be singular. This singularity, due to a resonance between a long and a short wave, was noted first by Wilton [10] and has been studied more recently in [11–15].

In these lecture notes, we explain how traveling water waves may be computed using a High-Order Perturbation of Surfaces (HOPS) approach, which numerically computes the coefficients in an amplitude-based series expansion of the free surface. For the water wave problem, a crucial aspect of any numerical approach is the method used to handle the unknown fluid domain. Popular examples include Boundary Integral Methods [16, 17], conformal mappings [18, 19], and series computations of the Dirichelet-to-Neumann operator [20, 21]. Here we discuss an alternative approach, in which the solution is expanded using the Transformed Field Expansion (TFE) method, developed in [22, 23].

The TFE method has been used to compute traveling waves on both two-dimensional (one horizontal and one vertical dimension) and three-dimensional fluids, both for planar and short-crested waves [23]. Short-crested wave solutions to the potential flow equations have been computed without surface tension [22, 24, 25] and with surface tension [26]. They have also been studied experimentally [27, 28].

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Publisher: Cambridge University Press
Print publication year: 2016

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References

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