# What are the theoretical models used for the numerical simulation of each of the physical effects?

From Riskan Wiki

Most Riskan templates are derived from templates created by TNO in the Yellow Book and Green Book]. Some particular models have other sources such as the puddle spreading model based on theModel AIChE] and the model for dispersion of heavy gases, which is based on the [SLAB model by Ermak, L . Donald].

For more detail, the mathematical models used by Riskan are described here.

Return to the FAQ, go to the previous question (Who are the main users of Riskan?) or go to the next question (What are the numerical methods used to implement the theoretical models?).