PDF Modelling of Autoignition in Nonpremixed Turbulent Flows

Abstract This paper presents the formulation and results of numerical simulation of autoignition in gaseous, nonpremixed, turbulent flows. Two specific problems are considered, (a) a homogeneous, isotropic turbulence with chemical reactions and mixing, and (b) an axisymmetric, fuel jet released into an oxidiser environment. For the first problem the fluid mechanics and combustion are decoupled, while the second problem fully incorporates such a coupling. A hybrid computational approach is adopted wherein the governing mean flow and the κ — ϵ equations are solved through a finite-volume, predictor-corrector, pressure implicit code TURBO-2D and the joint scalar pdf-transport equation (pdf= probability density function) is simulated via a Monte Carlo technique. The flow code and the pdf code togelher run in tandem with each other. The fluid dynamics code supplies the mean flow and turbulence quantities to the pdf code. The pdf code, in turn, provides the mean mass density via the mean thermochemical scalars ...

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