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arXiv 1506.06362math.NAcs.NA
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双线性有限体积元解椭圆问题的梯度超收敛性

The Gradient Superconvergence of Bilinear Finite Volume Element for Elliptic Problems

Northeastern University(东北大学);The State Key Laboratory of Synthetical Automation for Process Industries(流程工业综合自动化国家重点实验室)

Tie Zhang, Lixin Tang

AI总结:

本文研究双线性有限体积元解椭圆问题的梯度超收敛性,通过建立弱估计证明梯度近似具有超收敛性质,误差与h²lnh成正比。

摘要:

我们研究双线性有限体积元(FVE)解椭圆问题的梯度超收敛性。首先,建立了FVE方法双线性形式的超近似弱估计。然后证明FVE解的梯度近似具有超收敛性质:$\max_{P\in S}|(\nabla u-\overline{\nabla}u_h)(P)|=O(h^2)|\ln h|$,其中$\overline{\nabla}u_h(P)$表示包含点P的元素上的平均梯度,S是由网格点、边中点和元素中点组成的最优应力点集。

英文摘要:

We study the gradient superconvergence of bilinear finite volume element (FVE) solving the elliptic problems. First, a superclose weak estimate is established for the bilinear form of the FVE method. Then, we prove that the gradient approximation of the FVE solution has the superconvergence property: $\max_{P\in S}|(\nabla u-\overline{\nabla}u_h)(P)|=O(h^2)|\ln h|$, where $\overline{\nabla}u_h(P)$ denotes the average gradient on elements containing point $P$ and $S$ is the set of optimal stress points composed of the mesh points, the midpoints of edges and elements.

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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