Accession Number : ADP005043

Title :   Application of CFD Techniques Toward the Validation of Nonlinear Aerodynamic Models,

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

Personal Author(s) : Schiff,Lewis B. ; Katz,Joseph

Report Date : NOV 1985

Pagination or Media Count : 15

Abstract : Applications of CFD methods to determine the regimes of applicability of nonlinear models describing the unsteady aerodynamic responses to aircraft flight motions are described. The potential advantages of computational methods over experimental methods are discussed and the concepts underlying mathematical modeling are reviewed. The economic and conceptual advantages of the modeling procedure over coupled, simultaneous solutions of the gasdynamic equations and the vehicle's kinematic equations of motion are discussed. The modeling approach, when valid, eliminates the need for costly repetitive computation of flowfield solutions. For the test cases considered, the aerodynamic modeling approach is shown to be valid.

Descriptors :   *AERODYNAMIC FORCES, *MATHEMATICAL MODELS, NONLINEAR ANALYSIS, AERODYNAMIC CHARACTERISTICS, DYNAMIC RESPONSE, AIRCRAFT, MOMENTS, FLIGHT MANEUVERS, AERODYNAMIC LOADING, OSCILLATION, NUMERICAL METHODS AND PROCEDURES

Distribution Statement : APPROVED FOR PUBLIC RELEASE