LIMITATIONS OF THE STOCHASTIC APPROACH IN 2-PHASE TURBULENT-FLOW CALCULATIONS

Limitations of the stochastic approach, a method widely used in simula ting droplet dispersion in turbulence, are examined using two well-def ined two-phase, turbulent flow problems. It is found that the stochast ic approach is restricted to flows in which the continuous and dispers ed phases can meet each other's correlative condition. Also, use of th e steady-state formula of the drag coefficient in the Lagrangian equat ion of motion for models based on the stochastic approach could cause significant errors in the prediction of complete two-phase turbulent s tructures, particularly for large droplets.