The unsteady effect of drag coefficient in the stochastic Eulerian-Lagrangian computation of a two-phase, turbulent, planar mixing layer flow of droplets-in-gas type is examined. It is found that the use of an unsteady drag coefficient in modeling two-phase turbulent flows with the stochastic Eulerian-Lagrangian formulation is necessary to obtain complete information of the dispersed-phase turbulence characteristics. It is shown that the use of the quasisteady drag coefficient, which is mostly adopted in two-phase turbulent flow computations, does not cause too much deviation in the determination of mean quantities of the droplet velocity through use of the ensemble-averaging method weighting with the probability density function of the carrier phase.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering