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arXiv 2001.00971math.NAcs.NA
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线性不定常偏微分方程Runge-Kutta间断Galerkin方法的误差分析

Error analysis of Runge--Kutta discontinuous Galerkin methods for linear time-dependent partial differential equations

Zheng Sun, Chi-Wang Shu

摘要:

本文给出了线性不定常偏微分方程的全离散Runge-Kutta间断Galerkin(DG)格式的误差估计。分析适用于显式龙格-库塔时间离散的任何顺序。对于空间离散化,考虑了一种通用的离散算子,它涵盖了各种DG方法,如迎风偏置DG方法,中央DG方法,局部DG方法和超弱DG方法。当解足够光滑且空间算子具有一定性质时,我们得到了稳定相容全离散格式的误差估计。讨论了格式在双曲守恒律、热方程、色散方程和波动方程中的应用。特别地,我们提供了另一种证明的最优误差估计的局部DG方法的方程的高阶导数在一维,它不依赖于能量不等式的辅助未知量。

英文摘要:

In this paper, we present error estimates of fully discrete Runge--Kutta discontinuous Galerkin (DG) schemes for linear time-dependent partial differential equations. The analysis applies to explicit Runge--Kutta time discretizations of any order. For spatial discretization, a general discrete operator is considered, which covers various DG methods, such as the upwind-biased DG method, the central DG method, the local DG method and the ultra-weak DG method. We obtain error estimates for stable and consistent fully discrete schemes, if the solution is sufficiently smooth and a spatial operator with certain properties exists. Applications to schemes for hyperbolic conservation laws, the heat equation, the dispersive equation and the wave equation are discussed. In particular, we provide an alternative proof of optimal error estimates of local DG methods for equations with high order derivatives in one dimension, which does not rely on energy inequalities of auxiliary unknowns.

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