Computations of Droplet/Flow Interactions in Sprays

Abstract

The behavior of liquid fuel sprays was studied by direct numerical simulations. Two- and three- dimensional simulations were used to determine both the formation of drops and their interaction with the ambient flow. The Navier-Stokes equations were solved by a finite difference/front tracking technique that allowed resolution of inertial and viscous forces as well as the inclusion of surface tension at the deformable boundary between the fuel and the air. To examine the primary atomization and the formation of drops, several simulations of the breakup of sheared immiscible interfaces have been done. Two-dimensional simulations were used to examine the initial breakup and to establish the necessary numerical resolution. A three-dimensional code using cylindrical coordinates and local grid refinement has been used to examine how the initial two-dimensional instability becomes a fully three- dimensional "fiber" that eventually breaks up into drops.

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Document Details

Document Type
Technical Report
Publication Date
Oct 02, 2001
Accession Number
ADA396788

Entities

People

  • Gretar Tryggvason

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Atomization
  • Boundaries
  • Computational Fluid Dynamics
  • Computations
  • Equations
  • Fluid Dynamics
  • Fluids
  • Grids
  • Instability
  • Mechanical Engineering
  • Navier Stokes Equations
  • Reynolds Number
  • Simulations
  • Surface Tension
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Internal Combustion Engine (ICE) Technology.
  • Structural Dynamics.