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arXiv 0906.0780nlin.SInlin.PS
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模拟浅水波的两分量可积系统:常涡度情形

Two component integrable systems modelling shallow water waves: the constant vorticity case

Rossen I. Ivanov

AI总结:

本文从 Euler 方程等基本条件出发,通过渐近展开推导出包含常涡度的浅水波近似模型方程,并将其与三个两分量可积系统相关联,揭示了常涡度对浅水波方程的具体影响。

摘要:

在本文中,我们描述了几个两分量可积系统在经典浅水波问题中的作用。我们推导的起点是不可压缩流体的 Euler 方程、质量守恒方程、最简底部和表面条件以及常涡度条件。通过引入适当的尺度并截断物理量的渐近展开至适当阶数,生成了近似模型方程。所得方程可与三个不同的可积系统相关联:Camassa-Holm 方程的两分量推广、Zakharov-Ito 系统和 Kaup-Boussinesq 系统。这些结果的重要意义在于包含了涡度,这是过去十年来日益受到关注的浅水波重要特征。本研究表明,在特定阶数之前,模型方程如何与波所在的剪切流相关联。具体而言,它准确展示了常涡度如何影响这些方程。

英文摘要:

In this contribution we describe the role of several two-component integrable systems in the classical problem of shallow water waves. The starting point in our derivation is the Euler equation for an incompressible fluid, the equation of mass conservation, the simplest bottom and surface conditions and the constant vorticity condition. The approximate model equations are generated by introduction of suitable scalings and by truncating asymptotic expansions of the quantities to appropriate order. The so obtained equations can be related to three different integrable systems: a two component generalization of the Camassa-Holm equation, the Zakharov-Ito system and the Kaup-Boussinesq system. The significance of the results is the inclusion of vorticity, an important feature of water waves that has been given increasing attention during the last decade. The presented investigation shows how -- up to a certain order -- the model equations relate to the shear flow upon which the wave resides. In particular, it shows exactly how the constant vorticity affects the equations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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