Accession Number:

ADA256038

Title:

3D Navier-Stokes Flow Analysis for Shared and Distributed Memory MIMD Computers

Descriptive Note:

Final rept. 15 May 1990-30 Jul 1992

Corporate Author:

AMTEC ENGINEERING INC BELLEVUE WA

Personal Author(s):

Report Date:

1992-09-15

Pagination or Media Count:

119.0

Abstract:

Multiple instruction multiple data MIMD parallel computers were investigated as a means of obtaining the immense computer power required to analyze the flow about a complete aircraft configuration. A computational fluid dynamics computer program for solving the Navier-Stokes equations, with coupled nonequilibrium chemistry, was parallelized on three MIMD computer the Intel Touchstone distributed memory computer, the Cray YMP supercomputer, and the Silicon Graphics IRIS 4-D380 shared memory computer. The program used an LU-SGS implicit algorithm. The parallelization was performed using permanent domain decomposition. The parallel efficiency and the main limitations to efficient parallelization were evaluated for a series of real life engineering problems. On the Intel Touchstone, the parallel efficiency decreased slowly as the number of processors was increased. The main deterrent to parallel performance was the latency time for interprocessor communication. On the Cray YMP, the parallel efficiency dropped rapidly as the number of processors was increased. The main deterrent to parallel performance was the reduction in vector length during domain decomposition. 3D Navier-Stokes, Viscous-Flow, Compressible-Flow, Hypersonic Parallel, Shared Memory, Distributed Memory.

Subject Categories:

  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE