A novel finite difference scheme for Burgers' equation on unbounded domains

A novel finite difference scheme for Burgers' equation on unbounded domains
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无界域上 Burgers 方程的一种新颖的有限差分格式

DOI:
10.1016/j.apnum.2016.09.002
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发表时间:
2017
影响因子:
2.8
通讯作者:
Yufeng Liu
Yufeng Liu
中科院分区:
数学2区
文献类型:
--
作者:
Quan Zheng;Xin Zhao;Yufeng Liu

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本文研究了无限域上一维非齐次Burgers型方程的有限差分方法。在两个人工边界上应用两个精确的非线性人工边界条件,将原问题限制在有界计算区域内。函数变换使得Burgers方程和人工边界条件都是线性的。在此基础上,利用降阶方法和人工边界条件,提出了一种新的有限差分格式。证明了该方法对Burgers型方程具有时间上的3/2阶和空间上的2阶能量模的稳定性和收敛性。不同的算例说明了该方法的无条件稳定性和精度。
This paper studies a finite difference method for one-dimensional nonhomogeneous Burgers' equation on the infinite domain. Two exact nonlinear artificial boundary conditions are applied on two artificial boundaries to limit the original problem onto a bounded computational domain. A function transformation makes both Burgers' equation and artificial boundary conditions linear. Consequently, a novel finite difference scheme is developed by using the method of reduction of order for the obtained equation and artificial boundary conditions. The stability and the convergence with order 3/2 in time and 2 in space in an energy norm are proved for this method for Burgers' equation. Different examples illustrate the unconditional stability and the accuracy of the proposed method.
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