20.2 Autoignition Models

Autoignition phenomena in engines are due to the effects of chemical kinetics of the reacting flow inside the cylinder. There are two types of autoignition models considered in ANSYS FLUENT:

• knock model in spark-ignited (SI) engines

• ignition delay model in diesel engines

For information regarding the theory behind autoignition models, see this section in the separate Theory Guide. Section  20.2.1 descibes how to use the autoignition models in ANSYS FLUENT.