Accession Number : ADP005116

Title :   Geometry Definition and Grid Generation for a Complete Fighter Aircraft,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Edwards,Thomas A.

Report Date : NOV 1986

Pagination or Media Count : 12

Abstract : Recent advances in computing power and numerical solution procedures have enabled computational fluid dynamicists to attempt increasingly difficult problems. In particular, efforts are focusing on computations of complex three-dimensional flow fields about realistic aerodynamic bodies. To perform such computations, a very accurate and detailed description of the surface geometry must be provided, and a three-dimensional grid must be generated in the space around the body. The geometry must be supplied in a format compatible with the grid generation requirements, and must be verified to be free of inconsistencies. This paper presents a procedure for performing the geometry definition of a fighter aircraft that makes use of a commercial computer aided design/computer aided manufacturing system. Furthermore, visual representations of the geometry are generated using a computer graphics system for verification of the body definition. Finally, the three-dimensional grids for fighter like aircraft are generated by means of an efficient new parabolic grid generation method. This method exhibits good control of grid quality, and generate grids about 50 times faster than comparable grids generated via elliptic algorithms.

Descriptors :   *FIGHTER AIRCRAFT, *COMPUTER AIDED DESIGN, FINITE DIFFERENCE THEORY, AERODYNAMIC CONFIGURATIONS, THREE DIMENSIONAL FLOW, FLOW FIELDS, COMPUTER AIDED MANUFACTURING

Distribution Statement : APPROVED FOR PUBLIC RELEASE