191	1997	Rickard Enander and Erik Sterner	erik@tdb.uu.se	Analysis of internal boundary conditions and communication strategies for multigrid multiblock methods

			Abstract

When the steady state solution of a PDE is obtained by a 
multigrid method on a mesh consisting of a number of blocks the
performance will differ from the single block case. In this report we
identify and analyze the mechanisms behind this difference by studying
simple model problems in one space dimension.