Applied Math Seminar Announcement

The simulation of spray combustion requires the modeling of turbulent reacting multiphase flows, where the gas phase is described with the time-dependent, compressible, Reynolds/Favre-averaged conservation equations for mass, species, momentum and energy, together with the equations for the turbulence model. The liquid phase is governed by a stochastic formulation of the discrete droplet model which considers drop-drop and drop-gas interactions. A characteristic time approach is utilized for the description of the kinetic and diffusion-controlled chemical reactions.

The modeling aspects of this talk focus on the Enhanced Taylor Analogy Breakup (ETAB) atomization and drop breakup model, in which the jet disintegration is described as a cascade of drop breakups and the actual breakup events reflect the experimentally observed breakup mechanisms. The validity  of the ETAB model is demonstrated by direct comparison with experimental data. The performance of the reacting sprays is evaluated in conjunction with the one-equation simplified kinetics ignition (SKI) model. Applications of these models to the simulation of large-bore diesel engines are presented. In particular, investigations of spray interactions and their consequences are discussed.