Accession Number : ADA298030

Title :   Transient Shear Layer Dynamics of Two- and Three- Dimensional Open Cavities.

Descriptive Note : Final rept. 1 Dec 92-31 May 95,

Corporate Author : CINCINNATI UNIV OH

Personal Author(s) : Orkwis, Paul D. ; Disimile, Peter J.

PDF Url : ADA298030

Report Date : 31 JUL 1995

Pagination or Media Count : 79

Abstract : An experimental and computational research effort was performed to investigate the flow physics inherent in supersonic open cavities. Experiments were performed on a 2:1 length to depth ratio, 12:1 aspect ratio cavity at a Mach number of 2 and a Reynolds number based on momentum thickness of 3.69x 104. Wind tunnel velocity profiles were obtained for use as inflow boundary conditions in the computations. Time averaged and time unsteady surface pressure data were taken and analyzed for spectral frequency content and compared to Rossiter's empirical formula. Computations were made at the experimental conditions and results compared with the experimental data. A detailed comparison of results obtained with all reported cavity modifications of the Baldwin-Lomax turbulence model was performed to determine which simulated best both time averaged and time unsteady properties. Time histories of flow fields were obtained and compared to the oscillation cycle descriptions of Rockwell and Naudascher, and Heller and Bliss. Results indicate qualitative agreement with the former but considerable differences with the latter. Recommendations are made for obtaining improved simulations and greater understanding of the flow physics. (AN)

Descriptors :   *COMPUTATIONAL FLUID DYNAMICS, *FLOW FIELDS, *UNSTEADY FLOW, *SUPERSONIC FLOW, *CAVITATION, MATHEMATICAL MODELS, ALGORITHMS, COMPUTERIZED SIMULATION, EXPERIMENTAL DATA, SHOCK WAVES, BOUNDARY LAYER, TURBULENCE, FLOW VISUALIZATION, VORTEX SHEDDING, WIND TUNNEL TESTS, MACH NUMBER, TWO DIMENSIONAL FLOW, SUPERSONIC CHARACTERISTICS, OSCILLATION, FREE STREAM, VISCOSITY, SOUND PRESSURE, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, SHEAR FLOW, THREE DIMENSIONAL FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE