Accession Number : ADA298845

Title :   The Effects of Three-Dimensional Imposed Disturbances on Bluff Body Near Wake Flows.

Descriptive Note : Final rept.,

Corporate Author : IMPERIAL COLL OF SCIENCE TECHNOLOGY AND MEDICINE LONDON (UNITED KINGDOM)

Personal Author(s) : Bearman, Peter W. ; Szewczyk, Albin A.

PDF Url : ADA298845

Report Date : MAR 1993

Pagination or Media Count : 5

Abstract : Research Goals: To achieve a better understanding of the underlying three-dimensional flow structure in the near wake of a nominally two- dimensional bluff body. To understand the effects of three-dimensional features that are characterised by vortex splitting and looping on wake parameters such as base pressure, vortex shedding frequency, wake width and vortex formation length. An underlying aim is to investigate why, for Reynolds numbers greater than a few hundred, some flow quantities predicted by two-dimensional numerical simulations of bluff body flows are not always in good agreement with experiment. Objectives: (1) To control the occurrence of three-dimensionality in the shed vortices by applying mild three-dimensional geometric disturbances along the span. (2) To study the effects of geometric disturbances on wake parameters such as: Strouhal number, base pressure and vortex formation length. (3) To visualize vortex dislocations and the various modes of shedding. (4) To understand the dynamics of vortex dislocations. (KAR) p. 2

Descriptors :   *THREE DIMENSIONAL, *WAKE, *THREE DIMENSIONAL FLOW, FREQUENCY, SIZES(DIMENSIONS), DYNAMICS, PARAMETERS, QUANTITY, TWO DIMENSIONAL, NUMERICAL ANALYSIS, VORTICES, VORTEX SHEDDING, DISLOCATIONS, GEOMETRY, WIDTH, FLOW, SPLITTING, NEAR FIELD, REYNOLDS NUMBER, BLUNT BODIES, BASE PRESSURE, STROUHAL NUMBER.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE