Accession Number : ADA306274

Title :   Spatial Direct Numerical Simulation of Transition in Hypersonic Flows.

Descriptive Note : Final rept. 1 Feb 95-31 Jan 96,

Corporate Author : COLLEGE OF WILLIAM AND MARY WILLIAMSBURG VA

Personal Author(s) : Pruett, C. D.

PDF Url : ADA306274

Report Date : JAN 1996

Pagination or Media Count : 109

Abstract : Specifically, progress to date has proceeded on three fronts, each of which expands existing DNS capabilities in the direction of 'configuration DNS' stated in general objective 1 above. Previous experimental and numerical work on the elliptic-cone problem by others has shown that crossflow instabilities, rather than first or second mode instabilities, are likely to dominate the transition process when the eccentricity of the cross-sectional ellipse is moderate to large. Thus, the problem is particularly difficult for two reasons: (1) existing DNS capabilities must be expanded in terms of configuration (complex geometry), and (2) little or no experience exists in the simulation of crossflow instability for high-speed flows. Because of the difficulty of the problem, it was deemed best to proceed incrementally, from the current state of the art along three fronts: (1) simulation of transition on a flared, axisymmetric cone in hypersonic flow, (2) simulation of crossflow instability on a supersonic swept wing, and (3) simulation of a transitional hypersonic flow on a cone with an elliptical.

Descriptors :   *COMPUTERIZED SIMULATION, *BOUNDARY LAYER TRANSITION, *HYPERSONIC FLOW, PRESSURE GRADIENTS, MATHEMATICAL MODELS, ALGORITHMS, SPATIAL DISTRIBUTION, TURBULENT BOUNDARY LAYER, VORTICES, COMPUTATIONAL FLUID DYNAMICS, FLOW VISUALIZATION, SWEPT WINGS, COMPRESSIBLE FLOW, FLOW FIELDS, TEMPERATURE GRADIENTS, INTERPOLATION, KINETIC ENERGY, PERTURBATIONS, MACH NUMBER, NUMERICAL METHODS AND PROCEDURES, SUPERSONIC CHARACTERISTICS, NAVIER STOKES EQUATIONS, INVISCID FLOW, FREE STREAM, INSTABILITY, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, THERMAL STRESSES, BOUNDARY LAYER FLOW, CROSS FLOW, LAMINAR BOUNDARY LAYER, AXISYMMETRIC FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE