A Numerical Study of Viscous Flows Around Airfoils.

Abstract

The application of an integro-differential approach in the numerical study of unsteady viscous flows about airfoils is described. Two different procedures are presented. A procedure based on a stream function-vorticity formulation and on a transformation technique is used in a study of a flow about an impulsively started 9% thick Joukowski airfoil at an angle of attack of 15 deg and a Reynolds number of 1000. Numerical results are presented and compared with available finite-difference results. A second procedure based on a velocity-vorticity formulation and on a hybrid finite difference-finite element technique is used in a study of a flow about an oscillating 12% thick Joukowski airfoil at a Reynolds number of 1000. With either procedure, the unique ability of the integro-differential approach to confine the solution field to the vortical region of the flow is utilized. It is shown that this ability offers great computational advantages. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1977
Accession Number
ADA046084

Entities

People

  • Jianzhi Wu
  • L. N. Sankar
  • S. Sampath

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Mechanical Properties
  • Pressure Distribution
  • Reynolds Number
  • Stratified Fluids
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.