Chemical kinetic uncertainty quantification for Large Eddy Simulation of turbulent nonpremixed combustion

CATEGORY: COMBUSTION
Proceedings of the Combustion Institute, Volume 34, Issue 1, 2013, Pages 1299–1306
Chemical kinetic uncertainty quantification for Large Eddy Simulation of turbulent nonpremixed combustion
Michael E. Mueller (a), Gianluca Iaccarino (a), Heinz Pitsch (a), (b)
a Department of Mechanical Engineering, Stanford University, United States
b Institute for Combustion Technology, RWTH Aachen University, Germany
Abstract
Chemical kinetic mechanisms continue to improve in accuracy. However, these mechanisms are still models.  They sometimes embody 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.
Authors present a method for quantifying the uncertainty in turbulent flame simulations due to input uncertainty in the chemical mechanism. The method is designed for Large Eddy Simulation (LES) combined with a steady flamelet model. Rather than a brute force probabilistic approach in which hundreds or thousands of LES runs are required to compute statistics of outputs of interest, the method takes advantage of the actual algorithm employed with the steady flamelet model.
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