arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.01136math.NAcs.NA
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分数阶微积分移位卷积quadrature的统一理论

The unified theory of shifted convolution quadrature for fractional calculus

Yang Liu, Baoli Yin, Hong Li, Zhimin Zhang

摘要:

卷积求积理论是分析Riemann-Liouville分数次算子$I^α$在节点$x_{n}$上的逼近的一种系统方法。在本文中,我们发展了移位卷积求积($SCQ$)理论,它通过引入移位参数$θ$来推广卷积求积理论,以覆盖尽可能多的数值格式,这些格式以整数收敛速度逼近算子$I^α$。详细讨论了参数$θ$的约束条件,从一个新的角度考察了某些格式的超收敛现象。在分析偏微分方程方法的稳定性或收敛性估计时,为了达到技术上的目的,我们在$SCQ$的框架下设计了一些新的具有所需性质的公式.最后,我们用非光滑解进行了一些数值试验,进一步证实了我们的理论。

英文摘要:

The convolution quadrature theory is a systematic approach to analyse the approximation of the Riemann-Liouville fractional operator $I^α$ at node $x_{n}$. In this paper, we develop the shifted convolution quadrature ($SCQ$) theory which generalizes the theory of convolution quadrature by introducing a shifted parameter $θ$ to cover as many numerical schemes that approximate the operator $I^α$ with an integer convergence rate as possible. The constraint on the parameter $θ$ is discussed in detail and the phenomenon of superconvergence for some schemes is examined from a new perspective. For some technique purposes when analysing the stability or convergence estimates of a method applied to PDEs, we design some novel formulas with desired properties under the framework of the $SCQ$. Finally, we conduct some numerical tests with nonsmooth solutions to further confirm our theory.

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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