Accession Number : AD0612482

Title :   COLLAPSE OF TURBULENT WAKES IN DENSITYSTRATIFIED MEDIA,

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Wu,Jin

Report Date : JAN 1965

Pagination or Media Count : 47

Abstract : The wake generated by a submerged body moving through a density-stratified medium consists not only of a region of turbulence but also of a region of water with homogeneous density. The purpose of the present research is to study phenomena and modeling criteria relating to the collapse of this wake. Since the wake is very slender in the direction of the body passage, this problem is simplified by studying only the collapse of a particular transverse section of the wake. An experimental technique was successfully developed by using a wall-mixer to model the collapsing phenomen of a two-dimensional wake in densitystratified media. The process of collapse can be divided into three stages: 'initial', 'principal' and 'final' collapse stages. Empirical formulae were derived to describe the collapse processes of the first two stages, during which the gravitational effect is found to be the predominant modeling criterion. The collapsing process in the final stage was complicated by the increasing viscous effect and observed mixing at the thin wake tip. (Author)

Descriptors :   (*WAKE, DEGRADATION), (*GRAVITY, HYDRODYNAMICS), DENSITY, TURBULENCE, TWO DIMENSIONAL FLOW, BOUNDARY LAYER, LAMINAR FLOW, OCEANOGRAPHY, UNDERWATER OBJECTS, MATHEMATICAL MODELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE