In Ansys Forte, the species conversion and heat release in the regions outside the turbulent flame brush are modeled as chemical-kinetics-controlled processes. Specifically, the computational cells in the post-flame zone and the end-gas zone are simulated in the same manner as described in Chemistry Solver Options . In these zones, the chemical processes are assumed to be primarily controlled by the reaction pathways defined by the chemical kinetic mechanisms. The turbulence-kinetics interaction model can also be included for this portion in these regions.