Radiating solitary waves in coupled Boussinesq equations

Abstract

In this paper we are consider radiating solitary wave solutions of coupled regularised Boussinesq equations. This type of solution consists of a leading solitary wave with a small-amplitude co-propagating oscillatory tail, and emerges from a pure solitary wave solution of a symmetric reduction of the full system. We construct an asymptotic solution, where the leading order approximation in both components is obtained as a particular solution of the regularised Boussinesq equations in the symmetric case. At the next order, the system uncouples into two linear non-homogeneous ordinary differential equations with variable coefficients, one correcting the localised part of the solution, which we find analytically, and the other describing the co-propagating oscillatory tail. This latter equation is a fourth-order ordinary differential equation and is solved approximately by two different methods, each exploiting the assumption that the leading solitary wave has a small amplitude, and thus enabling an explicit estimate for the amplitude of the oscillating tail. These estimates are compared with corresponding numerical simulations.

20 pages, 7 figures

References in corpus (2)

• Initial-value problem for coupled Boussinesq equations and a hierarchy of Ostrovsky equations
• On radiating solitary waves in bi-layers with delamination and coupled Ostrovsky equations

Cited by in corpus (4)

• Soliton solutions to the fifth-order Korteweg - de Vries equation and their applications to surface and internal water waves
• Solitary Wave Propagation in Elastic Bars with Multiple Sections and Layers
• Periodic solutions of coupled Boussinesq equations and Ostrovsky-type models free from zero-mass contradiction
• D'Alembert-type solution of the Cauchy problem for a Boussinesq-Klein-Gordon equation