MULTIGRID ACCELERATION OF TIME-ACCURATE NAVIER-STOKES CALCULATIONS


                               N. Duane Melson
                         NASA Langley Research Center
                               Hampton, VA, USA

                               Mark D. Sanetrik
                   Analytical Services and Materials, Inc.
                               Hampton, VA, USA

A three-dimensional steady Navier-Stokes code for industrial-research has been
modified to calculate unsteady flows.  The original code used multigrid
acceleration, coupled with an explicit multistage Runge-Kutta scheme to obtain
steady solutions in O(n) operations.  Physical time derivative terms are added
to the scheme, and an iterative-implicit scheme is employed to advance the
solution in time.  The iterations at each time step are accelerated using the
multigrid strategies of the original three-dimensional solver.

The initial development of this scheme was presented at the 6th Copper
Mountain Conference on Multigrid Methods.  The proposed paper will describe
enhancements to the algorithm presented previously and will present some
results from recent applications of the algorithm to unsteady aerodynamic
flows.

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N Duane Melson
MS 128
NASA, Langley Research Center
Hampton VA 23681

n.d.melson@larc.nasa.gov

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