9.1.2 Limitations

The following limitations apply to the premixed combustion model:

• You must use the pressure-based solver. The premixed combustion model is not available with either of the density-based solvers.

• The premixed combustion model is valid only for turbulent, subsonic flows. These types of flames are called deflagrations. Explosions, also called detonations, where the combustible mixture is ignited by the heat behind a shock wave, can be modeled with the finite-rate model using the density-based solver. See Chapter  7 for information about the finite-rate model.

• The premixed combustion model cannot be used in conjunction with the pollutant (i.e., soot and NOx) models. However, a perfectly premixed system can be modeled with the partially premixed model (see Chapter  10), which can be used with the pollutant models.

• You cannot use the premixed combustion model to simulate reacting discrete-phase particles, since these would result in a partially premixed system. Only inert particles can be used with the premixed combustion model.