Computational Unsteady Flow Dynamics: Oscillating Flow About a Circular Cylinder

Abstract

The numerical experiments, carried out through the use of the vorticity-stream function equations and their finite difference form, on co- existing flows (sinusoidal or non-sinusoidal oscillation plus steady mean flow) are described. A third-order in time, second-order in space, three-level predictor-corrector finite-difference scheme has been used. The Poisson equation for the stream function was solved by a Fast Poisson Solver based on the High Order Difference Approximation with Identity Expansion (HODIE) and the Fast Fourier Transform (FFT) methods provided by the IMSL mathematical library. The results have revealed, for the first time, the existence of a very interesting wake comprised of three rows of heterostrophic vortices at certain Keulegan- Carpenter numbers and relative current ratios. The existence of such a street has been vindicated by physical experiments.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1991
Accession Number
ADA245144

Entities

People

  • David R. Gordon

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Agreements
  • Boundary Layer
  • Classification
  • Computational Fluid Dynamics
  • Computational Science
  • Equations
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Hydrodynamics
  • Navier Stokes Equations
  • Numerical Analysis
  • Reynolds Number
  • Steady Flow
  • Turbulent Mixing
  • Two Dimensional
  • Unsteady Flow

Readers

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

Technology Areas

  • Space
  • Space - Hall-Effect Thruster