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arXiv 1510.03499math.NAcs.NA
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二阶椭圆方程非散度形式的对偶弱伽辽金有限元法

A Primal-Dual Weak Galerkin Finite Element Method for Second Order Elliptic Equations in Non-Divergence Form

Georgia Institute of Technology(佐治亚理工学院);Taizhou College, Nanjing Normal University(南京师范大学泰州学院)

Chunmei Wang, Junping Wang

AI总结:

本文提出了一种新的数值算法,用于求解非散度形式的二阶椭圆方程。该方法基于弱伽辽金策略局部构造离散弱Hessian算子,通过最小化非负二次泛函并引入拉格朗日乘子变量,得到对称有限元方案,并推导了最优误差估计。

摘要:

本文提出了一种新的数值算法用于求解非散度形式的二阶椭圆方程。新方法基于弱伽辽金策略局部构造离散弱Hessian算子。数值解被定义为非负二次泛函的最小化,通过使用离散弱Hessian来模拟二阶椭圆方程的约束。所得到的欧拉-拉格朗日方程提供了一个对称有限元方案,涉及原变量和称为拉格朗日乘子的对偶变量,因此得名原-对偶弱伽辽金有限元法。在离散H²范数、通常的H¹范数和L²范数下推导了最优阶误差估计。一些数值结果展示了光滑和非光滑系数在凸和非凸域上的表现。

英文摘要:

This article proposes a new numerical algorithm for second order elliptic equations in non-divergence form. The new method is based on a discrete weak Hessian operator locally constructed by following the weak Galerkin strategy. The numerical solution is characterized as a minimization of a non-negative quadratic functional with constraints that mimic the second order elliptic equation by using the discrete weak Hessian. The resulting Euler-Lagrange equation offers a symmetric finite element scheme involving both the primal and a dual variable known as the Lagrange multiplier, and thus the name of primal-dual weak Galerkin finite element method. Optimal order error estimates are derived for the finite element approximations in a discrete $H^2$-norm, as well as the usual $H^1$- and $L^2$-norms. Some numerical results are presented for smooth and non-smooth coefficients on convex and non-convex domains.

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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