Subgrid modeling approaches for large-eddy simulation of single and two-phase reacting flows are discussed here with the focus on simulating high Reynolds number flows in practical devices. Therefore, issues related to computational expediency and accuracy of the subgrid model on relatively coarse grids are also discussed. It is suggested that models must not only capture the energy transfer from large to small scales, they must also account for small-scale mixing and molecular diffusion processes in order to predict high Re reacting flows. A subgrid modeling approach that can be used in multi-phase flows is described and sample results are shown to demonstrate its capabilities.
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