Mapping Closures for Turbulent Combustion.

Abstract

The overall objective of the research program was to develop and test an improved model for the process of molecular diffusion in turbulent reactive flows. In application to turbulent combustion, a major shortcoming of existing models is that they are non-local in composition. A model has been developed, based on the construction of a Euclidean minimum spanning tree (EMST). This model is inspired by the mapping closure, and reduces to it in the case of a single composition. In general, the model is asymptotically local, and hence overcomes a major flaw in previous models. The model has been tested for decaying scalars in isotropic turbulence and for a mean scalar gradient. Additionally, studies have been made of stochastic Lagrangian mode's for turbulent reactive flows; and an exact expression has been obtained for the probability density function of temperature (or other random quantities) in statistically stationary turbulence. Turbulent combustion, Mixing model.

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Document Details

Document Type
Technical Report
Publication Date
Apr 19, 1994
Accession Number
ADA279995

Entities

People

  • Stephen B. Pope

Organizations

  • Cornell University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Combustion
  • Computational Fluid Dynamics
  • Diffusion
  • Distribution Functions
  • Equations
  • Fluid Dynamics
  • Fluid Mechanics
  • Mechanical Properties
  • Mechanics
  • Particles
  • Personal Information Managers
  • Physics
  • Probability
  • Probability Density Functions
  • Skewness
  • Stationary
  • Turbulence

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Computational Modeling and Simulation
  • Statistical inference.