Research on the Post-Critical Stages of Transition.

Abstract

Linear-stability computations for the Blasius boundary layer have been performed in order to evaluate closure coefficients appearing in the Wilcox-Traci two-equation model of turbulence. The computations show that the key closure coefficient affecting the model's ability to accurately predict transition, lambda, is strongly frequency dependent until a given boundary-layer disturbance has been amplified to about (e to the 4th power) times its initial value. Beyond this point, lambda approaches an asymptotic profile which is independent of frequency, provided the boundary layer is unstable. Although further investigation is needed, results show promise that a sound, physically-founded synthesis of linear-stability and turbulence-model methods is possible. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1978
Accession Number
ADA053286

Entities

People

  • David C. Wilcox

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Capillary Electrophoresis
  • Coefficients
  • Computational Fluid Dynamics
  • Engineering
  • Equations
  • Flow
  • Fluid Flow
  • Jet Propulsion
  • Layers
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Pressure Gradients
  • Reynolds Number
  • Turbulent Flow
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.