Article,

The Morley Element for Fourth Order Elliptic Equations in any Dimensions

, and .
Numerische Mathematik, 103 (1): 155--169 (Jan 17, 2006)
DOI: 10.1007/s00211-005-0662-x

Abstract

In this paper, the well-known nonconforming Morley element for biharmonic equations in two spatial dimensions is extended to any higher dimensions in a canonical fashion. The general n-dimensional Morley element consists of all quadratic polynomials defined on each n-simplex with degrees of freedom given by the integral average of the normal derivative on each (n-1)-subsimplex and the integral average of the function value on each (n-2)-subsimplex. Explicit expressions of nodal basis functions are also obtained for this element on general n-simplicial grids. Convergence analysis is given for this element when it is applied as a nonconforming finite element discretization for the biharmonic equation.

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