Numerical Experiments in Unsteady Flows Through the Use of Full Navier- Stokes Equations

Abstract

The numerical simulations of impulsively started flow, non- impulsively started flow, sinusoidally oscillating flow, and, finally, co- existing flow (with mean and oscillatory components) past a circular cylinder have been investigated in great detail through the use of several compact schemes with the Navier-Stokes vorticity/stream function formulation for various Reynolds numbers, frequency parameters, and ambient flow/oscillating flow combinations using VAX-3520 and NASA's Supercomputers. Extensive sensitivity analysis has been performed to delineate the effects of time step, outer boundary, nodal points on the cylinder, and the use of higher order polynomials in the calculation of the gradient of wall vorticity. The results have been compared with those obtained experimentally. In many cases the predicted wake region, vorticity and pressure distributions, and the time-variation of the force coefficients have shown excellent agreement with those obtained experimentally.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1991
Accession Number
ADA245606

Entities

People

  • Christopher J. Putzig

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Computers
  • Equations
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Frequency
  • Navier Stokes Equations
  • Pressure Distribution
  • Reynolds Number
  • Steady Flow
  • Steady State
  • Turbulent Mixing
  • Two Dimensional
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.