Author(s)

V. John

Abstract

We present a comparison of Vanka and Braess-Sarazin smoothers in coupled mul- tigrid methods for the solution of incompressible Navier-Stokes equations describ- ing two-dimensional flows past obstacles. The numerical tests are based on the Crank-Nicolson time discretization and the nonconforming Pi/Po-finite element discretization in space on unstructured grids. All computations were performed on 32 processors of a MIMD parallel computer. The Vanka smoother turned out to be in general more efficient in this framework. 1 Introduction The efficient numerical solution of incompressible Navier-Stokes equations plays an important role in the numerical simulation of many complex problems in fluid mechanics. Benchmark computations (Schafer

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