Unsteady Behavior of Turbulent Shear Flows

Abstract

Theoretical studies on the temporal and spatial structure in blunt body wakes have revealed the necessary conditions under which global, self- sustained oscillations appear and have provided firm criteria for specifying the frequency of these oscillations. The theory has also been employed to describe the preferred mode in jets. In addition, a theoretical description of the appearance of the spatial chaos in wake-shear layers, and its representation in terms of a one-dimensional map, has been provided. An experimental facility and necessary instrumentation have been assembled and experiments are in progress on spatial chaos in wake-shear layers. Preliminary results have revealed a parameter domain where a temporal vacillation occurs between the Karman wake mode and the shear layer mode.

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Document Details

Document Type
Technical Report
Publication Date
Jul 25, 1990
Accession Number
ADA231836

Entities

People

  • Chih-ming Ho
  • L. G. Redekopp
  • P. Huerre

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Reactions
  • Combustion
  • Computational Fluid Dynamics
  • Computational Science
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Hydrodynamics
  • Molecular Orbital Theory
  • Shear Flow
  • Three Dimensional
  • Turbulence
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Software Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.