ACCELERATED MULTIGRID CONVERGENCE AND HIGH-REYNOLDS RECIRCULATING-FLOWS

Techniques are developed for accelerating multigrid convergence in gen eral, and for advection-diffusion and incompressible flow problems wit h small viscosity in particular. It is shown by analysis that the slow ing down of convergence is due mainly to poor coarse-grid correction t o certain error components, and means for dealing with this problem ar e suggested, analyzed, and tested by numerical experiments, showing ve ry significant improvement in convergence rates at little cost.