Comparison between presumed and Monte Carlo probability density function combustion models

The presumed probability density function (PDF) and PDF transport methods are applied to the simulation of two H-2/CO/N-2-air nonpremixed turbulent names for which experimental data are available. The thermochemical model is based on a one-step reduced reaction mechanism accounting for the finite rate kinetics of the free-radicals slow recombinations. A mixed finite volume/Monte Carlo technique is used to solve the composition PDF transport equation; this technique is coupled with a two-dimensional finite volume multiblock now solver that provides the mean velocity, pressure, and eddy viscosity fields, The convective terms in the conservation equations for the momentum components are approximated via a second-order total variation diminishing scheme; it is shown that on coarse grids this scheme performs more accurately than the classical first-order hybrid scheme, Comparable results between the presumed PDF and PDF transport methods are observed.