Accession Number : AD0429174


Title :   GENERAL RESEARCH ON THE OSCILLATIONS OF A TURBULENT FLOW,


Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF


Personal Author(s) : Betchov,R. ; Criminale,W. O.


Report Date : 27 JAN 1964


Pagination or Media Count : 27


Abstract : A turbulent boundary layer is assimilated to a laminar layer of large and variable viscosity. This viscosity represents the eddy viscosity. A stability analysis is performed for small perturbations by the use of a digital computer. It is found that a typical turbulent layer is stable, even if the eddy viscosity vanishes at the wall. However if the mean velocity profile has a weak inflection near the outer edge, instabilities do occur. Various observations of the intermittent part of the layer suggest the existence of such inflections and lead to acceptable values of the wavelengths and phase velocities. It is also found that the laminar sublayer has a negligible effect on this type of oscillation. (Author)


Descriptors :   (*TURBULENT BOUNDARY LAYER, FLUID FLOW), MOTION, THEORY, LAMINAR BOUNDARY LAYER, VISCOSITY, TURBULENCE, STABILITY, MATHEMATICAL MODELS, VELOCITY, PRESSURE, OSCILLATION, FUNCTIONS(MATHEMATICS), DIGITAL COMPUTERS, VORTICES


Distribution Statement : APPROVED FOR PUBLIC RELEASE