Higher order multipoint flux mixed finite element methods on quadrilaterals and hexahedra
Higher order multipoint flux mixed finite element methods on quadrilaterals and hexahedra
复制标题
四边形和六面体的高阶多点通量混合有限元方法
DOI:
10.1142/s0218202519500167
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发表时间:
2019
影响因子:
3.5
通讯作者:
Yotov, Ivan
中科院分区:
文献类型:
--
作者:
Ambartsumyan, Ilona;Khattatov, Eldar;Lee, Jeonghun J.;Yotov, Ivan
We develop higher order multipoint flux mixed finite element (MFMFE) methods for solving elliptic problems on quadrilateral and hexahedral grids that reduce to cell-based pressure systems. The methods are based on a new family of mixed finite elements, which are enhanced Raviart–Thomas spaces with bubbles that are curls of specially chosen polynomials. The velocity degrees of freedom of the new spaces can be associated with the points of tensor-product Gauss–Lobatto quadrature rules, which allows for local velocity elimination and leads to a symmetric and positive definite cell-based system for the pressures. We prove optimalth order convergence for the velocity and pressure in their natural norms, as well asst order superconvergence for the pressure at the Gauss points. Moreover, local postprocessing gives a pressure that is superconvergent of orderin the full-norm. Numerical results illustrating the validity of our theoretical results are included.
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DOI:
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发表时间:
2012
期刊:
影响因子:
--
作者:
R. A. Klausen;A. Stephansen
通讯作者:
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DOI:
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1996
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Mathematical Modelling and Numerical Analysis
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Math. Comput.
影响因子:
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2006
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通讯作者:
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DOI:
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发表时间:
2012
期刊:
SIAM J. Numer. Anal.
影响因子:
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作者:
A. Stephansen
通讯作者:
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