CONDITIONAL METHODS IN APPLICATION FOR LAGRANGIAN MODELING

The exact unclosed equation for the phase-space density function (or c orresponding Lagrangian pdf) in turbulent flows is obtained using cond itional techniques. The equation has direct implications for stochasti c Lagrangian models based on the assumption of similarity with a Marko v process. The problem of random particle sources is examined and the appropriate correcting term is suggested. (C) 1998 American Institute of Physics.