Accession Number : ADA289145

Title :   Basic Studies in Turbulent Shear Flows. End of the Fiscal-Year Summary Report for 1994.

Corporate Author : HOUSTON UNIV TX DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Hussain, Fazle

PDF Url : ADA289145

Report Date : 1994

Pagination or Media Count : 33

Abstract : The goal of this research is to understand the underlying physics of turbulence phenomena through coherent structures (CS). The aim is not only to understand the flow physics but also to devise methods for turbulence prediction and control. Our approach utilizes experiment, numerics and theory to understand both CS dynamics and structure. CS are studied in two ways: (i) long- time, global dynamics using experimental data and dynamical systems theory and (ii) crucial, localized CS interactions understood via vorticity dynamics. Below, we have summarized results in several key areas: (i) global dynamics in a forced plane mixing layer (ii) ODE models for spatially developing free shear flows, (iii) core dynamics and transition in a plane mixing layer, (iv) vorticity and helicity statistics in a circular jet, (v) new approaches to identifying sources of jet noise, and (vi) the kinematic separation of homogeneous mixtures.

Descriptors :   *SHEAR PROPERTIES, *TURBULENT FLOW, KINEMATICS, GLOBAL, EXPERIMENTAL DATA, CORES, PREDICTIONS, DYNAMICS, LAYERS, THEORY, STRUCTURES, COHERENCE, TURBULENCE, VORTICES, MIXTURES, PHYSICS, SEPARATION, MIXING, CIRCULAR, HOMOGENEITY, JET AIRCRAFT NOISE.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE