8.3.2 Using the Non-Premixed Model for Liquid Fuel or Coal Combustion

You can use the non-premixed model if your ANSYS FLUENT simulation includes liquid droplets and/or coal particles. In this case, fuel enters the gas phase within the computational domain at a rate determined by the evaporation, devolatilization, and char combustion laws governing the dispersed phase. In the case of coal, the volatiles and the products of char can be defined as two different types of fuel (using two mixture fractions) or as a single composite off-gas (using one mixture fraction), as described in this section in the separate User's Guide.