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arXiv 1503.02096math.NAcs.NA
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波导本征值问题与张量无限Arnoldi方法

The waveguide eigenvalue problem and the tensor infinite Arnoldi method

KTH Royal Institute of Technology(皇家理工学院);SeRC swedish e-science research center(瑞典电子科学研究中心)

Elias Jarlebring, Giampaolo Mele, Olof Runborg

AI总结:

本文提出解决大规模非线性本征值问题的新方法,介绍张量无限Arnoldi方法用于波导本征值问题,并分析其复杂度。

摘要:

我们提出了一种新的计算方法,用于解决一类大规模非线性本征值问题(NEPs),其中本征值是非线性的。本文的贡献是双方面的:我们推导出一种新的迭代算法,即张量无限Arnoldi方法(TIAR),适用于一般类别的NEPs,并展示了如何将该算法专门应用于特定的NEP:波导本征值问题。波导本征值问题源自有限元离散化用于研究周期介质中波传播的偏微分方程(PDE)。该算法成功应用于准确求解基准问题以及复杂的波导。我们研究了专用算法的复杂度,从理论和实践中分析其与迭代次数m和问题规模n的关系。对于波导本征值问题,我们建立该算法计算主导部分的复杂度为O(nm² + sqrt(n)m³)。因此,TIAR应用于波导本征值问题的渐近复杂度,当n趋于无穷时,与Arnoldi方法用于标准本征值问题的复杂度相同。

英文摘要:

We present a new computational approach for a class of large-scale nonlinear eigenvalue problems (NEPs) that are nonlinear in the eigenvalue. The contribution of this paper is two-fold. We derive a new iterative algorithm for NEPs, the tensor infinite Arnoldi method (TIAR), which is applicable to a general class of NEPs, and we show how to specialize the algorithm to a specific NEP: the waveguide eigenvalue problem. The waveguide eigenvalue problem arises from a finite-element discretization of a partial differential equation (PDE) used in the study waves propagating in a periodic medium. The algorithm is successfully applied to accurately solve benchmark problems as well as complicated waveguides. We study the complexity of the specialized algorithm with respect to the number of iterations m and the size of the problem n, both from a theoretical perspective and in practice. For the waveguide eigenvalue problem, we establish that the computationally dominating part of the algorithm has complexity O(nm^2 + sqrt(n) m^3). Hence, the asymptotic complexity of TIAR applied to the waveguide eigenvalue problem, for n that goes to infinity, is the same as for Arnoldi's method for standard eigenvalue problems.

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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