Supercloseness of Linear DG-FEM and Its Superconvergence Based on the Polynomial Preserving Recovery for Helmholtz Equation
Supercloseness of Linear DG-FEM and Its Superconvergence Based on the Polynomial Preserving Recovery for Helmholtz Equation
复制标题
线性DG-FEM的超逼近性及其基于亥姆霍兹方程保多项式恢复的超收敛性
DOI:
10.1007/s10915-019-00906-5
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发表时间:
2019-01
影响因子:
2.5
通讯作者:
Zhang Zhimin
中科院分区:
文献类型:
--
作者:
Du Yu;Zhang Zhimin
In this paper we study the supercloseness property of the linear discontinuous Galerkin (DG) finite element method and its superconvergence behavior after post-processing by the polynomial preserving recovery (PPR). The error estimate with explicit dependence on the wave numberk, the penalty parameterand the mesh condition parameteris derived. We prove the supercloseness between the DG finite element solution and the linear interpolation and the superconvergence for the recovered gradient by the PPR under the assumption(his the mesh size) and certain mesh conditions. Furthermore, we estimate the error between the DG numerical gradient and recovered gradient, which motivates us to define the a posteriori error estimator and design a Richardson extrapolation to post-process the recovered gradient by PPR. Finally, some numerical examples are provided to confirm the theoretical results of superconvergence analysis.
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DOI:
10.1137/1.9780898717440
发表时间:
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期刊:
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