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arXiv 1208.3219math.NAcs.NA
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抛物问题的有限体积元方法的一些误差估计

Some error estimates for the finite volume element method for a parabolic problem

University of Crete(克里特大学);Texas A&M University(德克萨斯农工大学);Institute of Mathematics and Informatics, Bulgarian Acad. Sciences(保加利亚科学院数学与信息研究所);Chalmers University of Technology(查尔姆斯理工大学);University of Gothenburg(哥德堡大学);Institute of Applied and Computational Mathematics, FORTH(FORTH应用与计算数学研究所)

P. Chatzipantelidis, R. D. Lazarov, V. Thomee

AI总结:

针对齐次热方程,研究空间半离散和全离散有限体积元方法,推导光滑和非光滑初始数据的误差估计,并指出对称三角剖分下L2初始数据可达到最优二阶收敛,否则仅一阶收敛。

摘要:

我们研究了具有齐次Dirichlet边界条件的齐次热方程的空间半离散和全离散有限体积元方法,并推导了光滑和非光滑初始数据的误差估计。我们证明了我们早期工作\cite{clt11}中关于集中质量法的结果可以推广到当前情况。特别地,为了使仅属于$L_2$的初始数据在正时间达到最优二阶误差估计,需要满足一个特殊条件,该条件对于对称三角剖分成立。在没有这种条件的情况下,只能证明一阶收敛,并通过一个反例加以说明。对于几乎对称和分片几乎对称的三角剖分,结果有所改进。

英文摘要:

We study spatially semidiscrete and fully discrete finite volume element methods for the homogeneous heat equation with homogeneous Dirichlet boundary conditions and derive error estimates for smooth and nonsmooth initial data. We show that the results of our earlier work \cite{clt11} for the lumped mass method carry over to the present situation. In particular, in order for error estimates for initial data only in $L_2$ to be of optimal second order for positive time, a special condition is required, which is satisfied for symmetric triangulations. Without any such condition, only first order convergence can be shown, which is illustrated by a counterexample. Improvements hold for triangulations that are almost symmetric and piecewise almost symmetric.

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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