An improved PSI-cell method for turbulent multi-phase flows

The rapidly increasing capability of computers has led to the development of numerical models for two-phase flows. There are basically two schemes that have been used in literature to model two-dimensional subsonic gas-particle or gas-droplet flows; the two fluid methods and the trajectory method. The average equations which treat the conveying gas and the particle cloud as two interactive fluids are the basis of the two-fluid method. The other apporach to modelling gas particle flows is the trajectory approach. This approach, called PSI cell model is based on treating the droplets or particles as sources of mass, momentum and energy to the gaseous phase. The presented modifications of the PSI-cell method allows the computation, in an economic way, of complicated turbulent polydispersive(polyphase) flows. Some additional terms in the turbulence model equations are introduced in a theoretical manner. The results of numerical calculations point at the dissipative character of turbulent interphase interactions and the considerable dependence of macrostructure of the two-phase stream on the structure of turbulence.