Assessment of dynamic closure for premixed combustion large eddy simulation

摘要: Turbulent piloted Bunsen flames of stoichiometric methane–air mixtures are computed using the large eddy simulation (LES) paradigm involving an algebraic closure for filtered reaction rate. This involves scalar dissipation rate a progress variable. The model this parameter βc representing flame front curvature effects induced by turbulence, chemical reactions, molecular dissipation, and their interactions at sub-grid level, suggesting that may vary with filter width or be scale-dependent. Thus, it would ideal to evaluate dynamically LES. A procedure evaluation is discussed assessed direct numerical (DNS) data LES calculations. probability density functions obtained from DNS calculations very similar when turbulent Reynolds number sufficiently normalised laminar thermal thickness ...