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arXiv 2104.00286math.APmath.FAmath.OCphysics.flu-dyn
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矩形空间中线性水波系统的渐近性态

Asymptotic behaviour of a linearized water waves system in a rectangle

Pei Su

摘要:

本文研究了水深小于水平尺度的矩形区域中小振幅重力水波的渐近行为。控制作用在一个横向边界上,通过沿该边界施加水的水平加速度,作为标量输入函数u。系统的状态z由两个函数组成:沿顶部边界的水位$ζ$及其时间导数$\partial$ $ζ$ $\partial$ t。证明了当取浅度极限时,水波系统的解收敛于具有Neumann边界控制的一维波动方程的解。我们的方法是基于一个特殊的变量变换和一个散射半群,这提供了应用Trotter-Kato逼近定理的可能性。此外,我们使用详细的分析傅里叶级数的无量纲版本的部分狄利克雷到诺依曼和诺依曼到诺依曼算子在[1]中介绍。

英文摘要:

We consider the asymptotic behaviour of small-amplitude gravity water waves in a rectangular domain where the water depth is much smaller than the horizontal scale. The control acts on one lateral boundary, by imposing the horizontal acceleration of the water along that boundary, as a scalar input function u. The state z of the system consists of two functions: the water level $ζ$ along the top boundary, and its time derivative $\partial$$ζ$ $\partial$t. We prove that the solution of the water waves system converges to the solution of the one dimensional wave equation with Neumann boundary control, when taking the shallowness limit. Our approach is based on a special change of variables and a scattering semigroup, which provide the possiblity to apply the Trotter-Kato approximation theorem. Moreover, we use a detailed analysis of Fourier series for the dimensionless version of the partial Dirichlet to Neumann and Neumann to Neumann operators introduced in [1].

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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