The transport equation for the probability density function (pdf)P of a scalar variable in a turbulent field is derived and various closure approximations for the turbulent convective and the molecular transport term are discussed. For the special case of a turbulent diffusion flame, for which the density, temperature and composition can be considered as a function of a scalar variable f, the transport equation for P f (z) is closed using the conditional mean of the velocity for the turbulent convective term and an integral model for the molecular transport term. Preliminary results are presented and compared with a two-parameter form of the pdf Pf (z).
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