Chemical kinetic uncertainty quantification for large eddy simulation of turbulent nonpremixed combustion

Michael E. Mueller, Gianluca Iaccarino, Heinz Pitsch

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

While the accuracy of chemical kinetic mechanisms continues to improve, these mechanisms are still models with, sometimes considerable, uncertainty. In order to rigorously validate turbulent combustion simulations against experimental data, this uncertainty must be separated from deficiencies in the turbulent combustion model itself. In this work, a method is developed for quantifying the uncertainty in turbulent flame simulations due to input uncertainty in the chemical mechanism. Here the method is developed for Large Eddy Simulation (LES) combined with a steady flamelet model. Rather than a brute force approach in which hundreds or thousands of LES runs are required, the method takes advantage of the actual algorithm employed with the steady flamelet model. First, the uncertainty in the chemical kinetics is propagated through the flamelet equations, and the resulting joint distribution is used as a stochastic equation of state in the LES. Direct uncertainty in temperature and species mass fraction is obtained by sampling over the joint distribution as statistics are collected. Uncertainty due to "active" quantities such as density, viscosity, diffusivity, etc., is propagated using non-intrusive stochastic collocation, requiring a few LES runs.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 Fall Meeting
PublisherWestern States Section/Combustion Institute
Pages135-147
Number of pages13
ISBN (Electronic)9781618393043
StatePublished - Jan 1 2011
Externally publishedYes
EventFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 - Riverside, United States
Duration: Oct 17 2011Oct 18 2011

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 Fall Meeting

Other

OtherFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011
CountryUnited States
CityRiverside
Period10/17/1110/18/11

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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