带有时间分数阻尼的韦斯特韦尔特方程时步法数值分析

IF 2.2 2区数学 Q1 MATHEMATICS, APPLIED

Mathematics of Computation Pub Date : 2024-02-14 DOI:10.1090/mcom/3945

Katherine Baker, Lehel Banjai, Mariya Ptashnyk

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引用次数: 0

摘要

我们为非线性声学中的一个重要方程 Westervelt 方程开发了一种数值方法，该方程的衰减形式由一类非局部时间算子表示。基于梯形法则和 A 稳定卷积正交的时间半离散化方法得到了阐述和分析。连续方程的存在性和正则性分析为半离散系统的稳定性和误差分析提供了信息。误差分析包括考虑 t = 0 t = 0 处的奇异性，通过在数值方案中使用修正来解决这一问题。大量的数值实验证实了这一理论。

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Numerical analysis of a time-stepping method for the Westervelt equation with time-fractional damping

We develop a numerical method for the Westervelt equation, an important equation in nonlinear acoustics, in the form where the attenuation is represented by a class of nonlocal in time operators. A semi-discretisation in time based on the trapezoidal rule and A-stable convolution quadrature is stated and analysed. Existence and regularity analysis of the continuous equations informs the stability and error analysis of the semi-discrete system. The error analysis includes the consideration of the singularity at t = 0 t = 0 which is addressed by the use of a correction in the numerical scheme. Extensive numerical experiments confirm the theory.

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来源期刊

Mathematics of Computation 数学-应用数学

CiteScore

3.90

自引率

5.00%

发文量

审稿时长

7.0 months

期刊介绍： All articles submitted to this journal are peer-reviewed. The AMS has a single blind peer-review process in which the reviewers know who the authors of the manuscript are, but the authors do not have access to the information on who the peer reviewers are. This journal is devoted to research articles of the highest quality in computational mathematics. Areas covered include numerical analysis, computational discrete mathematics, including number theory, algebra and combinatorics, and related fields such as stochastic numerical methods. Articles must be of significant computational interest and contain original and substantial mathematical analysis or development of computational methodology.