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arXiv 2006.03409math.NAcs.NA
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两类经典Boussinesq型方程组变底形数值解的Galerkin有限元法

Galerkin finite element methods for the numerical solution of two classical-Boussinesq type systems over variable bottom topography

G. Kounadis, D. C. Antonopoulos, V. A. Dougalis

摘要:

我们考虑两个“经典”Boussinesq型系统模拟双向传播的长表面波在一个有限的通道与可变的底部地形。这两个系统都是从1-d Serre-Green-Naghdi(SGN)系统衍生而来的;其中一个系统适用于较强的底部变化,并且与Peregrine的系统一致,另一个系统适用于较小的底部变化。我们离散的空间变量简单的初边值问题(ibvp的)为两个系统使用标准的Galerkin-有限元法和证明$L^2$误差估计随后的半离散近似。我们耦合的计划与四阶精度,显式,经典的龙格库塔时间步进程序,并使用由此产生的完全离散的方法在数值模拟的色散波传播的各种边界条件,包括吸收的。我们详细描述的变化,孤波时,每个系统下的各种可变的底部环境的演变。我们评估这两个系统在近似这些流量的效果,通过比较他们的模拟结果与对方,模拟SGN系统,并与现有的实验数据从文献中。

英文摘要:

We consider two `Classical' Boussinesq type systems modelling two-way propagation of long surface waves in a finite channel with variable bottom topography. Both systems are derived from the 1-d Serre-Green-Naghdi (SGN) system; one of them is valid for stronger bottom variations, and coincides with Peregrine's system, and the other is valid for smaller bottom variations. We discretize in the spatial variable simple initial-boundary-value problems (ibvp's) for both systems using standard Galerkin-finite element methods and prove $L^2$ error estimates for the ensuing semidiscrete approximations. We couple the schemes with the 4th order-accurate, explicit, classical Runge-Kutta time-stepping procedure and use the resulting fully discrete methods in numerical simulations of dispersive wave propagation over variable bottoms with several kinds of boundary conditions, including absorbing ones. We describe in detail the changes that solitary waves undergo when evolving under each system over a variety of variable-bottom environments. We assess the efficacy of both systems in approximating these flows by comparing the results of their simulations with each other, with simulations of the SGN-system, and with available experimental data from the literature.

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