Abstract:

The behavior of dilute dispersion of particles in a stratified channel flow is investigated with large eddy simulation. The threedimensional NavierStokes and energy equations under the Boussinesq approximation are numerically solved using a fractionalstep method based on highorder accurate temporal schemes. The Lagrangian tracking approach is used to describe the dynamics of particles. The objectives of this study are to deal with the effect of the thermal buoyancy on the behavior of particles in the thermally stratified turbulent channel flow and examine particle concentrations under the stratified turbulent environment. In the present study, some typical cases are computed. To depict the effect of the thermal stratification on the particles transport, the mean value and fluctuation of resolved velocities of particles, as well as some typical instantaneous velocity fluctuation patterns are analyzed. Numerical results provide the characteristics of particle concentrations under different Stokes numbers. 

Key words: particles; stratified turbulence; large eddy simulation(LES); Lagrangian tracking approach