Superconvergence of new mixed finite element spaces

Authors:
YunKyong Hyon;Do Young Kwak
Affiliations:
Institute for Mathematics and Its Applications, University of Minnesota, 114 Lind, 207 Church St. S.E., Minneapolis, MN 55455, USA;Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea
Venue:
Journal of Computational and Applied Mathematics
Year:
2011

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Abstract

In this paper we prove some superconvergence of a new family of mixed finite element spaces of higher order which we introduced in [ETNA, Vol. 37, pp. 189-201, 2010]. Among all the mixed finite element spaces having an optimal order of convergence on quadrilateral grids, this space has the smallest unknowns. However, the scalar variable is only suboptimal in general; thus we have employed a post-processing technique for the scalar variable. As a byproduct, we have obtained a superconvergence on a rectangular grid. The superconvergence of a velocity variable naturally holds and can be shown by a minor modification of existing theory, but that of a scalar variable requires a new technique, especially for k=1. Numerical experiments are provided to support the theory.