The Structure of Turbulent Velocity Fields.

Abstract

Sinusoidal disturbances, symmetrically distributed about the centerline of a turbulent wake, were introduced near the trailing edge of a flat plate to generate the varicose mode of instability. Phase averaged measurements of the u component of velocity fluctuations were decomposed into the two modes, and the results were compared with the appropriate theoretical eigenfunctions. The later distribution of the amplitude and phase of each mode agree reasonably well with their theoretical counterparts. The amplitude ratio of the two modes appear to approach an asymptotic value in the far wake. Keywords: Turbulence; Wakes; Coherent structures; Modes.

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Document Details

Document Type
Technical Report
Publication Date
Jan 24, 1986
Accession Number
ADA179582

Entities

People

  • F. H. Champagne

Organizations

  • University of Arizona

Tags

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Amplitude
  • Asymmetry
  • Contracts
  • Eigenvectors
  • Engineering
  • Fluid Dynamics
  • Fluid Mechanics
  • Fourier Series
  • Hot Wire
  • Instability
  • Scientific Research
  • Security
  • Stratified Fluids
  • Trailing Edges
  • Turbulence

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.