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Stability of Symmetric Solitary Wave Solutions of a Forced Korteweg-de Vries Equation and the Polynomial Chaos

Published online by Cambridge University Press:  03 June 2015

Hongjoong Kim  and
Kyoung-Sook Moon
Hongjoong Kim*
Affiliation:
Department of Mathematics, Korea University, Seoul 136-701, Korea
Kyoung-Sook Moon*
Affiliation:
Mathematics & Information, Gachon University, Gyeonggi-do 461-701, Korea
*
Corresponding author. Email: hongjoong@korea.ac.kr
Email: ksmoon@gachon.ac.kr
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Abstract

In this paper, we consider the numerical stability of gravity-capillary waves generated by a localized pressure in water of finite depth based on the forced Korteweg-de Vries (FKdV) framework and the polynomial chaos. The stability studies are focused on the symmetric solitary wave for the subcritical flow with the Bond number greater than one third. When its steady symmetric solitary-wave-like solutions are randomly perturbed, the evolutions of some waves show stability in time regardless of the randomness while other waves produce unstable fluctuations. By representing the perturbation with a random variable, the governing FKdV equation is interpreted as a stochastic equation. The polynomial chaos expansion of the random solution has been used for the study of stability in two ways. First it allows us to identify the stable solution of the stochastic governing equation. Secondly it is used to construct upper and lower bounding surfaces for unstable solutions, which encompass the fluctuations of waves.

Keywords

65C2065C30Stabilitysolitary wavespolynomial chaosforced Korteweg-de Vries equation
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 4 , Issue 6 , December 2012 , pp. 833 - 847
Copyright
Copyright © Global-Science Press 2012

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