期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 32, 期 -, 页码 1499-1507出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.07.015
关键词
Multiple mapping conditioning; Sparse simulations; Diffusion flames
资金
- Australian Research Council
A sparse-Lagrangian multiple mapping conditioning (MMC) model for turbulent diffusion flames is presented and tested against experimental data for a piloted methane/air jet diffusion flame (Sandia Flame D). The model incorporates a large eddy simulation for the flow field and a stochastic multiple mapping conditioning (MMC) approach for the reactive scalars. The stochastic MMC models the filtered density function of the scalar composition field. The numerical implementation involves a sparse-Lagrangian particle scheme in which there are fewer particles than there are LES grid cells. Predictions of similar accuracy to previously published Flame D simulations are achieved using only 35,000 particles (of these only 10,000 are chemically active). Sub-filter conditional dissipation is modelled by interactions between pairs of particles which are closely located in a reference mixture fraction-space interpolated from the underlying Eulerian filtered field. A model is developed for the mixing time-scale which is proportional to the distance between mixing particles. It is shown that the time-scale can be adjusted to achieve good predictions for time-averaged mean and fluctuating statistics of passive and reactive scalars. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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