On the nested refinement of quadrilateral and hexahedral finite elements and the affine approximation
type: Item
instance of: scholarly article
title: On the nested refinement of quadrilateral and hexahedral finite elements and the affine approximation
zbMATH Open document ID: 1065.65135
author: Shangyou Zhang
published in: Numerische Mathematik
publication date: 2005-01-19T00:00:00Z
review text: This interesting and useful paper is devoted to the theory of finite element methods dealing with planar quadrilateral and three-dimensional ``hexahedral'' elements (cells of the grid). These quasicube cells are the images of the reference cube \([-1,1]^n,\;n=2,3\) under \(n\)-linear transformations that can be determined by the images of vertices (in the given order). It is important that the images of edges are straight line segments, for \(n=3\) the images of faces can be nonplanar. If \(n=2\) then a quasicube is a strictly convex quadrilateral. The author defines a measure of nonregularity of the cell that corresponds to its distinction from a parallelogram or a parallelepiped. He proves that under proper refinement procedures the introduced measure tends to zero. It enables him to replace \(n\)-linear transformations by affine ones and deal only with piecewise constant approximations for Jacobians. So the computational work for getting the corresponding linear system is essentially simplified without noticeable loss of the accuracy of the modified grid method. Numerical examples are given.
reviewed by: Evgeniĭ Dyakonov
Mathematics Subject Classification ID: 65N50
Mathematics Subject Classification ID: 65N30
Mathematics Subject Classification ID: 65N55
Mathematics Subject Classification ID: 35J25
zbMATH DE Number: 2130177
zbMATH Keywords: elliptic equations
zbMATH Keywords: quadrilateral and hexahedral elements
zbMATH Keywords: piecewise constant approximations for Jacobians
zbMATH Keywords: finite element methods
zbMATH Keywords: numerical examples
zbMATH Keywords: mesh refinement
MaRDI profile type: Publication
full work available at URL: s00211-004-0536-7
OpenAlex ID: W2012929744
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DOI: 10.1007/S00211-004-0536-7
description: scientific article; zbMATH DE number 2130177