Abstract
For an elliptic problem with variable coefficients in three dimensions, this article discusses local pointwise convergence of the three-dimensional (3D) finite element. First, the Green’s function and the derivative Green’s function are introduced. Secondly, some relationship of norms such as L2-norms, W1,∞-norms, and negative-norms in locally smooth subsets of the domain Ω is derived. Finally, local pointwise convergence properties of the finite element approximation are obtained.
Similar content being viewed by others
References
J H Brandts, M Křížek. History and future of superconvergence in three-dimensional finite element methods, Proceedings of the Conference on Finite Element Methods: Three-dimensional Problems, GAKUTO International Series Mathematical Sciences and Applications, Gakkotosho, Tokyo, 2001, 15: 22–33.
J H Brandts, M Křížek. Gradient superconvergence on uniform simplicial partitions of polytopes, IMA J Numer Anal, 2003, 23: 489–505.
J H Brandts, M Křížek. Superconvergence of tetrahedral quadratic finite elements, J Comput Math, 2005, 23: 27–36.
C M Chen. Optimal points of stresses for the linear tetrahedral element, Natural Sci J Xiangtan Univ, 1980, 3: 16–24. (in Chinese)
C M Chen. Construction theory of superconvergence of finite elements, Hunan Science and Technology Press, Changsha, China, 2001. (in Chinese)
L Chen. Superconvergence of tetrahedral linear finite elements, Internat J Numer Anal Model, 2006, 3: 273–282.
G Goodsell. Gradient superconvergence for piecewise linear tetrahedral finite elements, Technical Report RAL-90-031, Science and Engineering Research Council, Rutherford Appleton Laboratory, 1990.
G Goodsell. Pointwise superconvergence of the gradient for the linear tetrahedral element, Numer Methods Partial Differential Equations, 1994, 10: 651–666.
A Hannukainen, S Korotov, M Křížek. Nodal O(h4)-superconvergence in 3D by averaging piece-wise linear, bilinear, and trilinear FE approximations, J Comp Math, 2010, 28: 1–10.
W M He, X F Guan, J Z Cui. The local superconvergence of the trilinear element for the three-dimensional Poisson problem, J Math Anal Appl, 2012, 388: 863–872.
W M He, R C Lin, Z M Zhang. Ultraconvergence of finite element method by Richardson extrapolation for elliptic problems with constant coefficients, SIAM J Numer Anal, 2016, 54: 2302–2322.
W M He, Z M Zhang. 2k superconvergence of Q(k) finite elements by anisotropic mesh approximation in weighted Sobolev spaces, Math Comp, 2017, 86: 1693–1718.
V Kantchev, R D Lazarov. Superconvergence of the gradient of linear finite elements for 3D Poisson equation, Proceedings of the Conference on Optimal Algorithms, Bulgarian Academy of Sciences, Sofia, 1986, 172–182.
Q Lin, N N Yan. Construction and analysis of high efficient finite elements, Hebei University Press, Baoding, China, 1996. (in Chinese)
R C Lin, Z M Zhang. Natural superconvergent points in 3D finite elements, SIAM J Numer Anal, 2008, 46: 1281–1297.
J H Liu, B Jia, Q D Zhu. An estimate for the three-dimensional discrete Green’s function and applications, J Math Anal Appl, 2010, 370: 350–363.
J H Liu, Y S Jia. Estimates for the Green’s function of 3D elliptic equations, J Comp Anal Appl, 2017, 22: 1015–1022.
J H Liu, Y S Jia. 3D Green’s function and its finite element error estimates, J Comp Anal Appl, 2017, 22: 1114–1123.
J H Liu, H N Sun, Q D Zhu. Superconvergence of tricubic block finite elements, Sci China Ser A, 2009, 52: 959–972.
J H Liu, Q D Zhu. Maximum-norm superapproximation of the gradient for the trilinear block finite element, Numer Methods Partial Differential Equations, 2007, 23: 1501–1508.
J H Liu, Q D Zhu. Pointwise super closeness of tensor-product block finite elements, Numer Methods Partial Differential Equations, 2009, 25: 990–1008.
J H Liu, Q D Zhu. Pointwise supercloseness of pentahedral finite elements, Numer Methods Partial Differential Equations, 2010, 26: 1572–1580.
J H Liu, Q D Zhu. Maximum-norm superapproach of the gradient for quadratic finite elements in three dimensions, Acta Mathematica Scientia, 2006, 26: 458–466. (in Chinese)
A Pehlivanov. Superconvergence of the gradient for quadratic 3D simplex finite elements, Proceedings of the Conference on Numerical Methods and Application, Bulgarian Academy of Sciences, Sofia, 1989, 362–366.
A H Schatz, I H Sloan, L B Wahlbin. Superconvergence infinite element methods and meshes that are locally symmetric with respect to a point, SIAM J Numer Anal, 1996, 33: 505–521.
Z M Zhang, R C Lin. Locating natural superconvergent points of finite element methods in 3D, Internat J Numer Anal Model, 2005, 2: 19–30.
Q D Zhu, Q Lin. Superconvergence theory of the finite element methods, Hunan Science and Technology Press, Changsha, China, 1989. (in Chinese)
M Zlámal. Superconvergence and reduced integration in the finite element method, Math Comp, 1978, 32: 663–685.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Conflict of interest
The authors declare no conflict of interest.
Supported by Special Projects in Key Fields of Colleges and Universities in Guangdong Province (2022ZDZX3016), and Projects of Talents Recruitment of GDUPT.
Rights and permissions
About this article
Cite this article
Liu, Jh., Zhu, Qd. Local pointwise convergence of the 3D finite element. Appl. Math. J. Chin. Univ. 38, 210–222 (2023). https://doi.org/10.1007/s11766-023-3911-9
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11766-023-3911-9