四阶定常 Bi-Wave 奇异摄动问题的协调Galerkin 有限元拟一致超收敛分析  

Quasi-Uniform Superconvergence Analysis of Conforming GalerkinFinite Element Method for the Fourth Order Stationary Bi-Wave Singular Perturbation Problem

作　　者：吴颜眯 石东洋 

机构地区：[1]信息工程大学, 河南 郑州 [2]郑州大学,数学与统计学院, 河南 郑州

出　　处：《应用数学进展》2022年第3期1389-1399,共11页Advances in Applied Mathematics

摘　　要：在本文中,我们利用协调 Galerkin 有限元方法求解模拟高温超导体 d 波现象的四阶定常 Bi- wave 奇异摄动问题。首先,分析其线性问题的变分格式下解的有界性;其次,利用 Brouwer 不动点定理证明非线性 Bi-wave 问题逼近解的存在唯一性;进而,基千 Bogner-Fox-Schmit 单元的高精度性质,得到在能量模意义下不依赖于参数负次幕的拟一致超逼近和超收敛误差估计;最后,我们通过相应的数值算例验证理论分析的正确性。In this paper, the conforming Galerkin finite element method is presented to solve the fourth order stationary Bi-wave singular perturbation problem simulating high tem- perature superconductor d wave phenomenon. Firstly, the boundedness of the solution under the variational scheme of its linear problem is analyzed;Secondly, the existence and uniqueness of the approximate solution for the nonlinear Bi-wave problem are proved by using Brouwer fixed point theorem;Furthermore, based on the high ac- curacy property of Bogner-Fox-Schmit element, quasi-uniform superconvergence and superclose error estimates independent of the negative power of the parameter in the energy norm are obtained;Finally, the corresponding numerical examples are provided to verify the correctness of the theoretical analysis.

关 键 词：Bi-Wave 问题 Bogner-Fox-Schmit 元 解的存在唯一性 拟一致超逼近和超收敛性 

分 类 号：O17[理学—数学]