A subgrid mixing model for LES of nonpremixed turbulent combustionA new sub-grid mixing model for use in large eddy simulations of turbulent combustion is presented and applied to a hydrogen-air diffusion flame. The sub-grid model is based on Kerstein's Linear Eddy Model (1988). The model is first used to predict the mixing of a conserved scalar in a turbulent shear flow. The model correctly predicts the behavior of the pdf of the scalar field and displays a nonmarching peak at the preferred mixture fraction as the shear layer is traversed. It is then illustrated how a reduced chemical mechanism can be implemented within the linear eddy subgrid model formulation. The model is used to predict NO formation in hydrogen-air diffusion flame using a reduced chemical mechanism involving nine reactive scalars.
Document ID
19920043073
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcmurtry, P. A. (Utah, University Salt Lake City, United States)
Menon, S. (Quest Integrated, Inc. Kent, WA, United States)
Kerstein, A. R. (Sandia National Laboratories Livermore, CA, United States)