On the Use of Lagrangian Variables in Descriptions of Unsteady Boundary- Layer Separation

Abstract

The Lagrangian description of unsteady boundary-layer separation is reviewed from both analytical and numerical perspectives. We explain in simple terms how particle distortion gives rise to unsteady separation, and why a theory centred on Lagrangian coordinates provides the clearest description of this phenomenon. Included in the review are some of the more recent results for unsteady three-dimensional compressible separation. The different forms of separation that can arise from symmetries are emphasized. Current work includes a possible boundary-layer region, but still remains much closer to the surface that a typical body-length scale. (jhd)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1990
Accession Number
ADA227114

Entities

People

  • L. L. van Dommelen
  • Shui T. Lam
  • Stephen J. Cowley

Tags

Communities of Interest

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

DTIC Thesaurus Topics

  • Asymptotic Series
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Engineering
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Geometry
  • Hydrodynamics
  • Navier Stokes Equations
  • Reynolds Number
  • Three Dimensional
  • Turbulent Mixing
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Theoretical Analysis.