Address. Lehrstuhl Praktische Mathematik, Universitaet Kiel, 24098 Kiel, Germany
E-mail: wh@numerik.uni-kiel.de
sas@numerik.uni-kiel.de
Abstract. In this paper a new finite element approach is presented which allows the discretization of PDEs on domains containing small micro-structures with extremely few degrees of freedom. The applications of these so-called {\it Composite Finite Elements }are two-fold. They allow the efficient use of multi-grid methods to problems on complicated domains where, otherwise, it is not possible to obtain very coarse discretizations with standard finite elements. Furthermore, they provide a tool for discrete homogenization of PDEs without requiring periodicity of the data.
AMS classification. 65D05, 65N12, 65N15, 65N30, 65N50, 65N55
Key words. Finite Elements, Shortley-Weller discretization, complicated boundary