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arXiv 0911.2656math.NAcs.NA
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关于半线性抛物型方程有限差分解的渐近全局误差估计与控制

On Asymptotic Global Error Estimation and Control of Finite Difference Solutions for Semilinear Parabolic Equations

University of Southern Denmark(南丹麦大学);Technische Universität Darmstadt(达姆施塔特工业大学)

Kristian Debrabant, Jens Lang

AI总结:

本文扩展了Lang和Verwer关于初值问题的全局误差估计与控制方法,结合Richardson外推估计空间截断误差,通过渐近估计推导时空全局误差的输运方程近似,并在离散L2范数下实现容差比例和均匀或自适应网格细化的渐近控制。

摘要:

本文旨在将Lang和Verwer [SIAM J. Sci. Comput. 29, 2007] 中针对初值问题的全局误差估计与控制方法扩展到半线性抛物型偏微分方程的有限差分解。该方法与通过Richardson外推估计PDE空间截断误差相结合,以估计计算解的整体误差。通过使用渐近估计,忽略空间和时间步长足够小时的高阶误差项,推导出空间和时间全局误差的误差输运方程近似。通过容差比例和均匀或自适应网格细化,在离散$L_2$范数下实现渐近控制。数值例子说明了估计和控制策略的可靠性。

英文摘要:

The aim of this paper is to extend the global error estimation and control addressed in Lang and Verwer [SIAM J. Sci. Comput. 29, 2007] for initial value problems to finite difference solutions of semilinear parabolic partial differential equations. The approach presented there is combined with an estimation of the PDE spatial truncation error by Richardson extrapolation to estimate the overall error in the computed solution. Approximations of the error transport equations for spatial and temporal global errors are derived by using asymptotic estimates that neglect higher order error terms for sufficiently small step sizes in space and time. Asymptotic control in a discrete $L_2$-norm is achieved through tolerance proportionality and uniform or adaptive mesh refinement. Numerical examples are used to illustrate the reliability of the estimation and control strategies.

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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