Numerical Study of Non-Impulsively Started Flow Around a Circular Cylinder

Abstract

The effect of constant acceleration, prior to the establishment of a steady uniform flow, on some of the characteristics of the resulting time- dependent flow about a circular cylinder has been investigated numerically. It is shown that the occurrence of a local maximum drag is dependent on the parameters characterizing the non-impulsive nature of the ambient flow. However, the onset of the wake asymmetry and the evolution of the lift and drag forces during the transient period depend on the characteristics of the numerical perturbation used to initiate the asymmetric vortex shedding. It is concluded that the numerical methods can predict, to varying degrees of accuracy, the behavior of the symmetric state and the quasi-steady-state, but not of the intermediate state.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1990
Accession Number
ADA238051

Entities

People

  • Kent A. Fredrickson

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Engineering
  • Equations
  • Fluid Flow
  • Fluid Mechanics
  • Mechanical Engineering
  • Mechanics
  • Numerical Analysis
  • Pressure Distribution
  • Reynolds Number
  • Steady Flow
  • Steady State
  • Unsteady Flow
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Explosive Engineering.
  • Fluid Mechanics and Fluid Dynamics.