Large Eddy Simulation of Turbulent Combustion

Abstract

In the first part of this work, new models for describing sub-grid quantities in reactive LES settings were developed. These models included a new model for the sub-filter variance of a conserved scalar, a new method of filtering the G-equation, a resolution-sensitive description of the turbulent burning velocity, and a flamelet formulation valid near premixed fronts. The models were shown to offer improved predictive capability through application to experimental flames. In the second part, a new method to automatically generate skeletal kinetic mechanisms for surrogate fuels, using the directed relation graph method with error propagation, was developed. These mechanisms are guaranteed to match results obtained using detailed chemistry within a user-defined accuracy for any specified target. They can be combined together to produce adequate chemical models for surrogate fuels. A library containing skeletal mechanisms of various accuracies and domains of applicability was assembled.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2005
Accession Number
ADA448326

Entities

People

  • Heinz Pitsch

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Alkanes
  • Boltzmann Equation
  • Chemical Reactions
  • Chemistry
  • Combustion
  • Computational Fluid Dynamics
  • Continuous Chemical Reactors
  • Differential Equations
  • Equations
  • Filters
  • Fluid Dynamics
  • Hydrocarbon Fuels
  • Ignition Lag
  • Large Eddy Simulation
  • Materials Science
  • Simulations
  • Turbulent Mixing

Readers

  • Combustion science or combustion engineering.
  • Computational Fluid Dynamics (CFD)
  • Computational Modeling and Simulation