188	1996	Lars Ferm, Per Lötstedt	ferm@tdb.uu.se, Per.Lotstedt@saab.se	Blockwise adaptive grids with multigrid acceleration for compressible flow	

                        Abstract

In a multi-block code for compressible flow problems 
a method is introduced to adapt the cell resolution 
to control the numerical error in the steady state solution.
The refinement and coarsening of the grid is based on
an estimate of the discretization error. 
The convergence of the iterations is improved by the multigrid algorithm.
The global grids at the multigrid levels are chosen to improve the 
efficiency. The Euler solution is computed with a 
three-grid algorithm around a three-dimensional
wing. The accuracy and computational work are compared on a 
uniformly fine grid and the adapted grid.