Unsteady Laminar Boundary-Layer Flow

Abstract

The laminar compressible boundary layer over an insulated flat plate moving with a time-dependent velocity has been analyzed in detail. A group of parameters arise which, if large, provide that the classical "starting from rest" solution applies, and, if small, that the motion is quasi-steady. These parameters relate to the time required for temporal changes to diffuse through the boundary layer. Deviations from the quasi-steady velocity and temperature profiles have been computed. Unsteady laminar flows with pressure gradient and, probably, unsteady turbulent boundary layers are governed by similar parameters, which may be estimated in order to provide a criterion as to whether quasi-steadiness may be assumed for a given problem. The case of a fluctuating velocity field passing over a flat plate is discussed from this point of view.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1951
Accession Number
ADA380437

Entities

People

  • Franklin K. Moore

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Coefficients
  • Compressible Flow
  • Computational Fluid Dynamics
  • Coordinate Systems
  • Differential Equations
  • Equations
  • Equations Of Motion
  • Fluid Dynamics
  • Incompressible Flow
  • Laminar Boundary Layer
  • Layers
  • Leading Edges
  • Pressure Gradients
  • Steady Flow
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.

Technology Areas

  • Microelectronics