ALGORITHM 758 - VLUGR2 - A VECTORIZABLE ADAPTIVE-GRID SOLVER FOR PDESIN 2D

This article deals with an adaptive-grid finite-difference solver for time-dependent two-dimensional systems of partial differential equatio ns. It describes the ANSI Fortran 77 code, VLUGR2, autovectorizable on the Cray Y-MP, that is based on this method. The robustness and the e fficiency of the solver, both for vector and scalar processors, are il lustrated by the application of the code to two example problems arisi ng from a groundwater-flow model.