Reynolds averaged numerical simulation (RANS) of a turbulent partially premixed flame is performed using a presumed probability density function (Pdf) approach. The mixture fraction and the fuel mass fraction are respectively chosen to describe the local composition and the chemical reaction progress. The so called LW-P model was employed for the calculation of a lean methane-air flame stabilized by a stoichiometric pilot-flame. Numerical predictions of the jet-core as well as the mean quantities of the flame, namely the modified progress variable and the static temperature are compared successfully with the experiments. (C) 2014 Elsevier Ltd. All rights reserved.