A Stabilizer Free Weak Galerkin Finite Element Method for Elliptic Equation with Lower Regularity

IF 1.9 4区 数学 Q1 MATHEMATICS
Yiying Wang,Yongkui Zou,Xuan Liu, Chenguang Zhou
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引用次数: 0

Abstract

his paper presents error analysis of a stabilizer free weak Galerkin finite element method (SFWG-FEM) for second-order elliptic equations with low regularity solutions. The standard error analysis of SFWG-FEM requires additional regularity on solutions, such as $H^2$-regularity for the second-order convergence. However, if the solutions are in $H^{1+s}$ with $0 < s < 1,$ numerical experiments show that the SFWG-FEM is also effective and stable with the $(1+s)$-order convergence rate, so we develop a theoretical analysis for it. We introduce a standard $H^2$ finite element approximation for the elliptic problem, and then we apply the SFWG-FEM to approach this smooth approximating finite element solution. Finally, we establish the error analysis for SFWG-FEM with low regularity in both discrete $H^1$-norm and standard $L^2$-norm. The $(_Pk(T ), P_{k−1}(e), [P_{k+1}(T)]^d)$ elements with dimensions of space $d = 2, 3$ are employed and the numerical examples are tested to confirm the theory.
具有较低正则性的椭圆方程无稳定器弱 Galerkin 有限元方法
本文介绍了针对低正则解的二阶椭圆方程的无稳定器弱 Galerkin 有限元方法(SFWG-FEM)的误差分析。SFWG-FEM 的标准误差分析要求解具有额外的正则性,如二阶收敛的 $H^2$ 正则性。然而,如果解在$H^{1+s}$中,且$0 < s < 1,则数值实验表明 SFWG-FEM 也是有效且稳定的,具有$(1+s)$阶收敛率,因此我们对其进行了理论分析。我们为椭圆问题引入了一个标准的 $H^2$ 有限元近似解,然后应用 SFWG-FEM 逼近这个平滑的近似有限元解。最后,我们建立了 SFWG-FEM 在离散 $H^1$ 准则和标准 $L^2$ 准则下的低正则性误差分析。我们采用了空间维数为 $d = 2, 3$ 的 $(_Pk(T ), P_{k-1}(e), [P_{k+1}(T)]^d)$ 元素,并通过数值实例验证了这一理论。
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来源期刊
CiteScore
2.80
自引率
7.70%
发文量
33
审稿时长
>12 weeks
期刊介绍: Numerical Mathematics: Theory, Methods and Applications (NM-TMA) publishes high-quality original research papers on the construction, analysis and application of numerical methods for solving scientific and engineering problems. Important research and expository papers devoted to the numerical solution of mathematical equations arising in all areas of science and technology are expected. The journal originates from the journal Numerical Mathematics: A Journal of Chinese Universities (English Edition). NM-TMA is a refereed international journal sponsored by Nanjing University and the Ministry of Education of China. As an international journal, NM-TMA is published in a timely fashion in printed and electronic forms.
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