Mapping Closures for Turbulent Combustion.
Final rept. 15 Feb 91-14 Feb 94,
CORNELL UNIV ITHACA NY
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The overall objective of the research program was to develop and test an improved model for the process of molecular diffusion in turbulent reactive flows. In application to turbulent combustion, a major shortcoming of existing models is that they are non-local in composition. A model has been developed, based on the construction of a Euclidean minimum spanning tree EMST. This model is inspired by the mapping closure, and reduces to it in the case of a single composition. In general, the model is asymptotically local, and hence overcomes a major flaw in previous models. The model has been tested for decaying scalars in isotropic turbulence and for a mean scalar gradient. Additionally, studies have been made of stochastic Lagrangian modes for turbulent reactive flows and an exact expression has been obtained for the probability density function of temperature or other random quantities in statistically stationary turbulence. Turbulent combustion, Mixing model.
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