  The present work reports on LES of turbulent reacting flow of the
Delft-Jet-in-Hot-Coflow (DJHC) burner, emulating MILD combustion, with
transported PDF based combustion models using ANSYS FLUENT 13.0. Two different
eddy viscosity models for LES (Dynamic Smagorinsky and Kinetic Energy
Transport) along with two solution approaches for PDF transport equation, i.e.
Eulerian and Lagrangian, have been used in the present study. Moreover, the
effects of chemical kinetics and the micro-mixing models have also been
investigated for two different fuel jet Reynolds number (Re = 4,100 and Re =
8,800). The mean velocity and turbulent kinetic energy predicted by the
different models are in good agreement with experimental data. Both the
composition PDF models predict an early ignition resulting in higher radial
mean temperature predictions at burner exit. The models, however, correctly
predict the formation mechanism of ignition kernels and the decreasing trend of
the lift-off height with increasing jet Reynolds number, as observed
experimentally.
