Description of turbulent reacting dispersed flow by multi-point PDF-Method

摘要

This paper deals with the description of turbulent reacting dispersed flow by the multi-point pdf method. A n-point joint probability density function (pdf) is introduced. Its transport equation for evolution of the pdf is derived from the governing equations. It is impossible to solve the equation with the conventional finite difference methods because of its high dimensionality. A combined Monte-Carlo method for the solution of this kind of transport equation is developed. No turbulence modelling is needed for the effects of convection, reaction and interaction between both phases in the pdf transport equation. Therefore the gradient-diffusion assumptions for both phases from the conventional moment method can be avoided. The dissipation and pressure fluctuation is modeled by the particle interaction models. The simulation results show that this method can supply a more detailed explanation of the turbulent structure of reacting dispersed flow.