arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.13892math.NAcs.NA
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圆盘区域修正Helmholtz方程Neumann问题的基本解方法

Method of fundamental solutions for Neumann problems of the modified Helmholtz equation in disk domains

Shin-Ichiro Ei, Hiroyuki Ochiai, Yoshitaro Tanaka

摘要:

利用基本解方法构造有界区域上一类偏微分方程的近似解。它是通过组合的基本解转移到域外的点,并确定线性和的系数,以满足边界上的有限点的边界条件。本文严格证明了圆盘区域上修正Helmholtz方程Neumann问题的MFS近似解的存在性。给出了该问题存在近似解的充分条件。将Green定理应用于修正的Helmholtz方程的Neumann问题,通过边界积分将近似解与精确解之间的误差限制为边界条件函数与近似解的法向导数之差.利用这个误差估计,我们证明了MFS近似解收敛到指数阶精确解,即$N^2a^N$阶,其中$a$是小于1的正常数,$N$是配置点的个数.此外,还证明了在数值模拟中,随着配置点数目的增加,误差以指数顺序趋于$0$ $N$。

英文摘要:

The method of the fundamental solutions (MFS) is used to construct an approximate solution for a partial differential equation in a bounded domain. It is demonstrated by combining the fundamental solutions shifted to the points outside the domain and determining the coefficients of the linear sum to satisfy the boundary condition on the finite points of the boundary. In this paper, the existence of the approximate solution by the MFS for the Neumann problems of the modified Helmholtz equation in disk domains is rigorously demonstrated. We reveal the sufficient condition of the existence of the approximate solution. Applying Green's theorem to the Neumann problem of the modified Helmholtz equation, we bound the error between the approximate solution and exact solution into the difference of the function of the boundary condition and the normal derivative of the approximate solution by boundary integrations. Using this estimate of the error, we show the convergence of the approximate solution by the MFS to the exact solution with exponential order, that is, $N^2a^N$ order, where $a$ is a positive constant less than one and $N$ is the number of collocation points. Furthermore, it is demonstrated that the error tends to $0$ in exponential order in the numerical simulations with increasing number of collocation points $N$.

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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