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arXiv 0812.2316math.APmath-phmath.MP
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旋转水波的非局部形式

A Nonlocal Formulation of Rotational Water Waves

Anthony C. L Ashton, A. S. Fokas

摘要:

无旋水波的经典方程最近被重新表述为两个方程的系统,其中之一是一个显式的非局部方程的波高和速度势上的自由表面上评估。在二维情况下,(a)我们把有关公式推广到常涡量的情况,以及自由表面由多值函数描述的情况;(b)在行波情况下,我们导出自由表面的上界;(c)第(1)款在常涡度的情况下,我们构造了一系列近似哈密顿系统,它们提供了某些物理小扰动的渐近极限的近似。参数特别是,明确的涡度对KdV方程的系数的依赖性。此外,在无旋的情况下,我们扩展到n>2维的形式主义,并严格分析这些方程的线性极限。

英文摘要:

The classical equations of irrotational water waves have recently been reformulated as a system of two equations, one of which is an explicit non-local equation for the wave height and for the velocity potential evaluated on the free surface. Here, in the two dimensional case, (a) we generalise the relevant formulation to the case of constant vorticity, as well as to the case where the free surface is described by a multi-valued function; (b) in the case of travelling waves we derive an upper bound for the free surface; (c) in the case of constant vorticity we construct a sequence of nearly Hamiltonian systems which provide an approximation in the asymptotic limit of certain physical small parameters. In particular, the explicit dependence of the vorticity on the coefficients of the KdV equation is clarified. Also, in the irrotational case we extend the formalism to n>2 dimensions and analyse rigorously the linear limit of these 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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