Inflow conditions in stochastic Eulerian-Lagrangian calculations of two-phase turbulent flow

The importance of the inlet conditions of the dispersed-phase fluctuating velocity on the analysis associated with the stochastic Lagrangian method, which is commonly used in the simulation of two-phase turbulent flows, is demonstrated through two well-defined problems. One is under the inlet condition of the carrier-phase turbulent kinetic energy [k.sub.g] larger than the dispersed-phase turbulent kinetic energy [k.sub.p]. The other is associated with [k.sub.g] < [k.sub.p]. A solution procedure accounting for the inlet conditions of the fluctuating dispersed-phase velocities in the stochastic Lagrangian calculation is developed. It is also concluded that the unsteady drag coefficient has to be considered in the model formulation when the condition of the Stokes number larger than O([10.sup.1]) is encountered in the examined two-phase turbulent flowfield.