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发布时间：2019-03-11

论文类型：期刊论文

发表时间：2018-01-01

发表刊物：JOURNAL OF SCIENTIFIC COMPUTING

收录刊物：Scopus、EI、SCIE

卷号：74

期号：1

页面范围：324-335

ISSN号：0885-7474

关键字：Nonconforming element; Nonparametric; Finite element; Quadrilateral mesh

摘要：In this paper, a new nonparametric nonconforming quadrilateral finite element is introduced. This element takes the four edge mean values as the degrees of the freedom and the finite element space is a subspace of . Different from the other nonparametric elements, the basis functions of this new element can be expressed explicitly without solving linear systems locally, which can be achieved by introducing a new reference quadrilateral. To evaluate the integration, a class of new quadrature formulae with only three equally weighted points on quadrilateral are constructed. Hence the stiffness matrix can be calculated by the same way with the parametric elements. Numerical results are shown to confirm the optimality of the convergence order for the second order elliptic problems and the Stokes problem.