Streamwise Vorticity Decay Downstream of a Three-Dimensional Protuberance

Abstract

Streamwise vortices generated in boundary layers are known to persist for hundreds of boundary-layer thicknesses. This remarkable property is the main topic of this report. The particular case of the flow field generated by a three-dimensional protuberance immersed in a flat plate boundary layer is studied using numerical modeling. Experimental measurements in a downstream crossflow plane are used to construct initial data for a marching calculation using the boundary-layer and boundary-region approximations; the latter includes crossflow diffusion terms. The former fails to predict the flow field, but results from the latter agree qualitatively in aspects of the flow field determined from the measurements of Tani, et al., and are also in fair quantitative agreement.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1981
Accession Number
ADA108080

Entities

People

  • C. W. Kitchens Jr.
  • J. M. Bartos
  • N. Gerber
  • R. Sedney

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Diffusion
  • Downstream Flow
  • Equations
  • Experimental Data
  • Flow Fields
  • Flow Visualization
  • Fluid Flow
  • Jet Propulsion
  • Layers
  • Leading Edges
  • Measurement
  • Mechanics
  • Physics Laboratories
  • Reynolds Number
  • Three Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.
  • Plasma Physics / Magnetohydrodynamics