arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.16744math.NAcs.NA
收藏

时间相关偏微分方程谱方法的数学基础

Mathematical foundations of spectral methods for time-dependent PDEs

Arieh Iserles

AI总结:

本文提出时间相关偏微分方程谱方法的核心在于选择希尔伯特空间的正交基,并引入适用于柯西边界条件的T-系统和适用于零狄利克雷边界条件的W-系统,系统分析了它们在稳定性、收敛速度和线性代数效率等方面的特性。

摘要:

本文的核心论点是,用于时间相关偏微分方程的谱方法本质上不过是对底层希尔伯特空间的一组正交基的选择。这一选择受到一长串因素的制约:稳定性、收敛速度、几何数值积分、快速逼近以及高效线性代数。我们将不同的正交基选择置于这些考量之下进行检验,重点关注实直线上的情形。虽然在周期性边界条件下,傅里叶基几乎无可替代,但在其他情形中情况则有趣得多。我们引入两类正交基,即T-系统和W-系统,并详细研究它们的特性。T-系统设计用于柯西边界条件,而W-系统适用于零狄利克雷边界条件。

英文摘要:

The contention of this paper is that a spectral method for time-dependent PDEs is basically no more than a choice of an orthonormal basis of the underlying Hilbert space. This choice is governed by a long list of considerations: stability, speed of convergence, geometric numerical integration, fast approximation and efficient linear algebra. We subject different choices of orthonormal bases, focussing on the real line, to these considerations. While nothing is likely to improve upon a Fourier basis in the presence of periodic boundary conditions, the situation is considerably more interesting in other settings. We introduce two kinds of orthonormal bases, T-systems and W-systems, and investigate in detail their features. T-systems are designed to work with Cauchy boundary conditions, while W-systems are suited to zero Dirichlet boundary conditions.

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。

↑