Accession Number : AD0819270

Title :   AN ANALYSIS OF THE FORMATION AND MOTION OF TURBULENT PATCHES IN THE TRANSITION BOUNDARY LAYER,

Corporate Author : GENERAL DYNAMICS GROTON CT ELECTRIC BOAT DIV

Personal Author(s) : McCormick, Michael E.

Report Date : 07 APR 1967

Pagination or Media Count : 29

Abstract : An analysis is presented of the formation and motion of turbulent pressure patches under the transition boundary layer on a flat plate in a zero pressure gradient. The shape of the patch on the surface of the plate is assumed to be triangular with an area that increases as the patch moves downstream from its point of inception. The expressions for the cross-correlation and the cross-spectral density of the surface-pressure fluctuations which are obtained are both space and time dependent. A relation is shown to exist between the transition phenomena and the instabilities in the laminar boundary layer. Finally, the analytical results are used to determine the breakdown points of the laminar instabilities. (Author)

Descriptors :   (*BOUNDARY LAYER TRANSITION, TURBULENCE), (*FLAT PLATE MODELS, BOUNDARY LAYER TRANSITION), PRESSURE, TIME, SURFACE PROPERTIES, INCOMPRESSIBLE FLOW, PERIODIC VARIATIONS, MATHEMATICAL ANALYSIS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE