Accession Number : ADA299795

Title :   Stability Transition of High-Speed Flows over Realistic Bodies.

Descriptive Note : Final rept. 1 Apr 92-31 Mar 95,

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Herbert, T.

PDF Url : ADA299795

Report Date : 06 SEP 1995

Pagination or Media Count : 26

Abstract : The thrust of this research program has been the improvement of our capabilities for analyzing stability and transition in high-speed flows over realistic bodies. Examples of such bodies are swept wings of high-speed airplanes or the blunt conical bodies for hypersonic flight. We have extended the parabolized stability equations (PSE) for these situations and developed methods for solving these equations in disturbance environments typical of atmospheric conditions. Formulation, numerical methods, and program implementation have been selected toward applications in engineering practice. The PSE code has been utilized to analyze transition mechanisms in the flow over swept wings, an axisymmetric blunt cone and a sharp cone at angle of attack. Major efforts have been spent on receptivity mechanisms and on the effects of the disturbance environment on transition. Studies on the stability of 3D boundary layers suggest to replace the current tracing of discrete modes by tracing a field of modes in the flow direction.

Descriptors :   *FLOW VISUALIZATION, *SUPERSONIC FLOW, *BOUNDARY LAYER TRANSITION, MATHEMATICAL MODELS, ALGORITHMS, COMPUTERIZED SIMULATION, STABILITY, HIGH VELOCITY, VORTICES, COMPUTATIONAL FLUID DYNAMICS, ANGLE OF ATTACK, SWEPT WINGS, FINITE DIFFERENCE THEORY, PARTIAL DIFFERENTIAL EQUATIONS, HYDRODYNAMIC CODES, MACH NUMBER, UNSTEADY FLOW, NUMERICAL METHODS AND PROCEDURES, INVISCID FLOW, VISCOUS FLOW, CONICAL BODIES, REYNOLDS NUMBER, BLUNT BODIES, NONLINEAR PROGRAMMING, BOUNDARY LAYER FLOW, HYPERSONIC FLOW, THREE DIMENSIONAL FLOW, AXISYMMETRIC FLOW, SHARP BODIES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE