This document provides step-by-step instructions for modeling methane combustion using ANSYS CFX. It begins by importing a mesh file and defining boundary conditions including inlet velocities and species concentrations. Reaction kinetics are then specified by defining the combustion reaction and associated rate parameters. Finally, a high temperature boundary condition is applied to the mesh surface to ignite the combustion process. The tutorial aims to provide guidelines for initial combustion simulations while noting that input values may need refinement for accuracy.