WALL-FUNCTION TREATMENT IN PDF METHODS FOR TURBULENT FLOWS

A wall-function boundary condition is developed for the pdf/Monte Carl o method. Like traditional wall functions, this reproduces the logarit hmic velocity profile and shear stress in equilibrium flow conditions. A constant-stress analysis for the pdf, and a linear-stress analysis for the first two moments of the pdf are developed as the basis for th is wall-function approach. Stable and accurate boundary conditions are derived and demonstrated with fully-developed channel flow. (C) 1997 American Institute of Physics.