Quelques aspects de Ia modelisation numerique appliquee a Ia combustion turbulente
Keywords:
turbulence, combustion, direct numerical simulation, probability density function, mixing modelling, surface density fimction, large eddy simulation, lagrangian dynamic modellingAbstract
Various developments in turbulent combustion modelling are presented. First direct numerical simulations are used to study triples flames properties, and the possible role that they play in auto ignition of nonpremixed mixtures. Then, a bridge is built between probality density function and flame surface approaches. In particular, the proposed formalism, which is based on the definition of a surface density function, allows for studying the properties of isoconcentration surfaces from a purely statiscal point of view. Finally, a new technique is proposed for the modelling of turbulent combustion. It uses recent developments in the field of dynamic large eddy simulation techniques coupled with probability function approach.
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