New Higher-Order Boundary-Layer Equations for Laminar and Turbulent Flow Past Axisymmetric Bodies.

Abstract

New sets of boundary-layer equations accounting for flow field non-uniformities such as curvature effects, normal stress and pressure variations as well as separation, are derived. The boundary-layer flow domain in subdivided into: (1) a parabolic region where the fluid flow is approximately parallel to the submerged body, i.e., v<<u; and (2) an elliptic region which includes the line of separation where significant interactions between the boundary-layer and the outer potential flow occur, i.e., v approx u. Closure for the turbulent flow equations has to be obtained with submodels for the Reynolds stresses which reflect the effects of boundary-layer thickening as well as separation. The accuracy of the parabolic equations was compared with Van Dyke's higher-order boundary-layer equations for laminar flow past a body with longitudinal curvature. The results demonstrate that the new modeling equations make a measurable difference as expected from observations made by Bradshaw and others. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1982
Accession Number
ADA117806

Entities

People

  • A. Eglima
  • C. Kleinstreuer
  • J. E. Flaherty

Organizations

  • Rensselaer Polytechnic Institute

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Air Force
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Differential Equations
  • Equations
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Laminar Flow
  • Layers
  • Mechanical Properties
  • Pressure Gradients
  • Turbulent Boundary Layer
  • Turbulent Flow

Readers

  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.