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arXiv 1501.02424math.NAcs.NA
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双三维矩形莫里元对生物谐振方程的超收敛性

Superconvergence of both two and three dimensional rectangular Morley elements for biharmonic equations

Peking University(北京大学)

Jun Hu, Zhongci Shi, Xueqin Yang

AI总结:

本文研究了双三维矩形莫里元在生物谐振方程中的超收敛性,通过修正的规范插值算子建立二阶超收敛性,并通过标准后处理实现二阶超收敛,首次在无额外边界条件情况下实现非协调有限元方法的二阶超收敛。

摘要:

本文研究了生物谐振方程中二阶矩形莫里元的超收敛性。通过适当的后处理,实现了二阶超收敛性。分析依赖于一致性误差的二阶超收敛性和修正的规范插值算子,帮助建立修正规范插值的二阶超收敛性。最终超收敛性通过标准后处理实现。对于二维和三维第四阶椭圆问题的一阶非协调有限元方法,首次在不施加额外边界条件的情况下实现了二阶超收敛性。同时,首次在三维第四阶椭圆问题的非协调有限元方法中建立了超收敛性。数值结果用于验证理论结果。

英文摘要:

In the present paper, superconvergence of second order, after an appropriate postprocessing, is achieved for both the two and three dimensional first order rectangular Morley elements of biharmonic equations. The analysis is dependent on superconvergence of second order for the consistency error and a corrected canonical interpolation operator, which help to establish supercloseness of second order for the corrected canonical interpolation. Then the final superconvergence follows a standard postprocessing. For first order nonconforming finite element methods of both two and three dimensional fourth order elliptic problems, it is the first time that full superconvergence of second order is obtained without an extra boundary condition imposed on exact solutions. It is also the first time that superconvergence is established for nonconforming finite element methods of three dimensional fourth order elliptic problems. Numerical results are presented to demonstrate the theoretical results.

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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