Time-Dependent Simulations of Laminar and Turbulent Flows in COIL Geometries

Abstract

In this work, we report CFD studies of possible unsteadiness (flow transition and turbulence) effects in the injector/nozzle geometry of the Phillips Laboratory RotoCOlL (Chemical Oxygen Iodine Laser) Device. Earlier numerical studies based on the MINT code assumed steady, laminar device flow as necessary compromise for the complicated reacting flow COIL problem. Other studies based on the GASP code involve similar assumptions. Also, other studies to date assume the so-called unit cell' approximation. The unit cell approximation is the assumption that the flow in the COIL geometry is periodic with period equal to the distance between small (downstream-located) iodicne injectors and half the period between the large (upstream-located) I injectors. Our work examines the validity of this assumption and estimates its effect on the flow. Relaxation of the unit cell will be, we believe, important in future work.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2000
Accession Number
ADA384706

Entities

People

  • John I. Galea
  • K. P. Sreenivasan
  • Steven A. Orszag

Organizations

  • Yale University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Oxygen Iodine Lasers
  • Computational Fluid Dynamics
  • Creep
  • Engineering
  • Equations
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Mathematics
  • Mechanical Engineering
  • Pressure Gradients
  • Reynolds Number
  • Simulations
  • Three Dimensional
  • Turbulent Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

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

Technology Areas

  • Directed Energy