Secondary Frequencies in the Wake of a Circular Cylinder with Vortex Shedding

Abstract

A detailed numerical study of two-dimensional flow past a circular cylinder at moderately low Reynolds numbers has been conducted using three different numerical algorithms for solving the time-dependent compressible Navier-Stokes equations. It was found that if the algorithm and associated boundary conditions were consistent and stable, then the major features of the unsteady wake were well-predicted. However, it was also found that even stable and consistent boundary conditions could introduce additional periodic phenomena reminiscent of the type seen in previous wind-tunnel experiments. However, these additional frequencies were eliminated by formulating the boundary conditions in terms of the characteristic variables. An analysis based on a simplified model provides an explanation for this behavior. (JHD)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1990
Accession Number
ADA227099

Entities

People

  • David Gottlieb
  • David H. Rudy
  • James C. Townsend
  • Saul S. Abarbanel
  • Wai S. Don

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Computational Fluid Dynamics
  • Computational Science
  • Computations
  • Differential Equations
  • Equations
  • Far Field
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Free Stream
  • Frequency
  • Mach Number
  • Mechanics
  • Navier Stokes Equations
  • Reynolds Number
  • Strouhal Number
  • Vortex Shedding

Readers

  • Calculus or Mathematical Analysis
  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.