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arXiv 1801.09736math.NAcs.NAmath.AP
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边界元素与网格细化用于波动方程

Boundary elements with mesh refinements for the wave equation

Heriot–Watt University(赫瑞-瓦特大学);University of Paderborn(帕德博恩大学);Universität Stuttgart(斯图加特大学);Leibniz University Hannover(汉诺威莱布尼茨大学)

Heiko Gimperlein, Fabian Meyer, Ceyhun Oezdemir, David Stark, Ernst P. Stephan

AI总结:

本文研究了波动方程在多面体域中的边界和屏幕问题,通过时间域边界积分方程进行等价建模,分析解的正则性及数值近似,证明分级网格可恢复光滑解的最优逼近率,并通过数值实验验证了屏幕问题的理论。

摘要:

在$\mathbb{R}^3$中的多面体域中,波动方程的解在角落和边缘附近具有渐近奇异性展开。本文将波动方程的边界和屏幕问题转化为时间域的等价边界积分方程,研究其解的正则性性质及数值近似。受椭圆方程理论的启发,分级网格被证明能够恢复已知的光滑解的最优逼近率。数值实验验证了屏幕问题的理论,特别是讨论了狄利克雷和诺伊曼问题,以及狄利克雷到诺伊曼算子,以及轮胎声发射的应用。

英文摘要:

The solution of the wave equation in a polyhedral domain in $\mathbb{R}^3$ admits an asymptotic singular expansion in a neighborhood of the corners and edges. In this article we formulate boundary and screen problems for the wave equation as equivalent boundary integral equations in time domain, study the regularity properties of their solutions and the numerical approximation. Guided by the theory for elliptic equations, graded meshes are shown to recover the optimal approximation rates known for smooth solutions. Numerical experiments illustrate the theory for screen problems. In particular, we discuss the Dirichlet and Neumann problems, as well as the Dirichlet-to-Neumann operator and applications to the sound emission of tires.

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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