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arXiv 1802.02473nlin.PS
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耦合Boussinesq方程中的辐射孤立波

Radiating solitary waves in coupled Boussinesq equations

R. H. J. Grimshaw, K. R. Khusnutdinova, K. R. Moore

摘要:

本文考虑耦合正则化Boussinesq方程的辐射孤波解。这种类型的解决方案包括一个领先的孤立波与小振幅共同传播的振荡尾巴,并出现从一个纯孤立波解决方案的对称减少的整个系统。我们构造了一个渐近解,其中两个分量的首阶近似作为对称情况下正则化Boussinesq方程的特殊解。在下一个订单,该系统解耦成两个线性非齐次常微分方程的变系数,一个校正的局部部分的解决方案,我们发现解析,和其他描述的共同传播的振荡尾巴。后一个方程是一个四阶常微分方程,并通过两种不同的方法近似求解,每种方法都利用了领先的孤立波具有小振幅的假设,从而能够明确估计振荡尾部的振幅。这些估计与相应的数值模拟进行比较。

英文摘要:

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.

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