Accession Number : ADA321077

Title :   Assessment of Cartesian/Cubic Grid Systems for Computational Fluid Dynamic Analysis of Complex Geometries.

Descriptive Note : Final rept. 1 Apr 92-30 Sep 96,

Corporate Author : NORTH CAROLINA AGRICULTURAL AND TECHNICAL STATE UNIV GREENSBORO

Personal Author(s) : Hurley, Francis X. ; Min, Tony C. ; Li, Christen Y. ; Lai, Steven H.

PDF Url : ADA321077

Report Date : DEC 1996

Pagination or Media Count : 10

Abstract : A MacCormack time-stepping predictor-corrector method was applied to compressible subsonic flow about a NACA 0012 airfoil, using a composite van Driest turbulence model and a lowest order boundary condition interpolation. Since good AGARD pressure data was available, it was possible to compare processor times under the two grid systems for identical average pressure (lift) errors. The Cartesian system turned out to be less efficient by a factor of only three. Specifically, a 272x145 rectangular grid characterized by dense, point-wasteful bands competed with a 121x45 body oriented grid burdened with coordinate stretching factors. Some elementary analysis accompanying the numerical experiments gives further grounds for believing that Cartesian/cubic grids may be only modestly less efficient than the more standard, body oriented ones, while affording far greater generality and requiring far less operator intervention.

Descriptors :   *COMPUTATIONAL FLUID DYNAMICS, *FINITE DIFFERENCE THEORY, *CARTESIAN COORDINATES, MATHEMATICAL MODELS, TURBULENCE, GRIDS(COORDINATES), COMPRESSIBLE FLOW, FLOW FIELDS, INTERPOLATION, SUBSONIC FLOW, NAVIER STOKES EQUATIONS, AERODYNAMICS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE