Control of Separation Using Pulsed Wall Jets: Numerical Investigations Using DNS and LES

Abstract

In a numerical effort, the dynamics of coherent structures in unforced, and periodically forced, turbulent weak wall jets has been investigated. The objective of this research is to better understand the effect of pulsed blowing used for separation control on airfoils. The focus has been on flat plate geometries. In the simulations, weak wall jets are generated by steady and/or pulsed wall-tangential blowing through a wall-slot into a constant pressure or adverse pressure gradient boundary layer. Numerical approaches taken are Direct Numerical Simulations (DNS), Large-Eddy Simulations (LES), and Unsteady Reynolds-Averaged Navier-Stokes calculations (URANS). Using three-dimensional LES, it was shown that large-amplitude pulsed blowing can prevent flow separation.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2000
Accession Number
ADA386618

Entities

People

  • Hermann F. Fasel

Organizations

  • University of Arizona

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Geometry
  • Large Eddy Simulation
  • Mechanical Engineering
  • Mechanics
  • Reynolds Number
  • Three Dimensional
  • Turbulent Flow
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

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