Momentum Flux Increases and Coherent-Structure Dynamics in a Subsonic Axisymmetric Free Jet

Abstract

The spatial evolution of a high Reynolds number, axisymmetric free jet is computed numerically with a compressible, two-dimensional, finite- difference Flux-Corrected Transport algorithm and appropriate inflow and outflow boundary conditions. The simulated flow fields are examined to obtain an insight into the physics of large-scale organized structures in the transition region and to investigate the effects of the initial conditions, Mach number and controlled axial excitation. Contrary to the traditionally accepted notion of isobaric free jet flow, the results show significant streamwise increases in the momentum flux consistent with previously recorded experimental data. The results are discussed in terms of instantaneous velocity, vorticity and pressure fields. Keywords: Numerical analysis, Axisymmetric jet flow, Compressible flow, Two dimensional flow, Finite difference analysis, Computerized simulation, Coherent structures, Subsonic free jets, Compressible free shear flows.

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Document Details

Document Type
Technical Report
Publication Date
Aug 19, 1988
Accession Number
ADA198360

Entities

People

  • Elaine Oran
  • F. F. Grinstein
  • F. Hussain

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Energy Transfer
  • Experimental Data
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Jet Flow
  • Mach Number
  • Mechanical Engineering
  • Pressure Distribution
  • Reynolds Number
  • Shear Flow
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.