Design Tools for Zero Net Mass flux Devices: CFD Effort

Abstract

Numerical simulations have been used to examine the fluid dynamics of zero-net mass flux devices. The emphasis is on extracting insights that can be used in developing simple models of these actuators for use in separation control. The unsteady evolution of a transitional synthetic jet in the absence of cross-flow is investigated by time-accurate three- dimensional direct numerical simulations of incompressible Navier-Stokes equations and the results compared with one of the test cases designated for the NASA CFD Validation of Synthetic Jets and Turbulent Separation Control. The validated results are then used for a comprehensive analysis of the flow inside the cavity and the jet slot. The flux of vorticity from these devices is considered to be an important factor in the control of separated flow and in the current study, we have used numerical simulations to extract scaling laws for this quantity. A theoretical model is also proposed for determining the pressure losses in ZNMF slots and orifices and numerical simulations used to determine the scaling of some of the key parameters in this theoretical model.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2005
Accession Number
ADA435338

Entities

People

  • Rajat Mittal

Organizations

  • George Washington University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Hypervelocity Flow
  • Navier Stokes Equations
  • Reynolds Number
  • Scaling Laws
  • Simulations
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.