Volume 52, Number 5, September–October 2018
|Page(s)||1981 - 2001|
|Published online||11 December 2018|
A C0-nonconforming quadrilateral finite element for the fourth-order elliptic singular perturbation problem
School of Mathematical Sciences, Dalian University of Technology,
116024, P.R. China.
2 School of Software, Dalian University of Technology, Dalian 116620, P.R. China.
* Corresponding author: email@example.com
Accepted: 15 May 2018
In this paper, a C0 nonconforming quadrilateral element is proposed to solve the fourth-order elliptic singular perturbation problem. For each convex quadrilateral Q, the shape function space is the union of S21(Q*) and a bubble space. The degrees of freedom are defined by the values at vertices and midpoints on the edges, and the mean values of integrals of normal derivatives over edges. The local basis functions of our element can be expressed explicitly by a new reference quadrilateral rather than by solving a linear system. It is shown that the method converges uniformly in the perturbation parameter. Lastly, numerical tests verify the convergence analysis.
Mathematics Subject Classification: 65N30
Key words: Singular perturbation problem / quadrilateral element / uniformly convergent
© EDP Sciences, SMAI 2018
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