Computational fluid dynamics (CFD) offers a series of advantages, mainly in terms of speed and capacity to obtain results that are faithful to the real model. This work details the process to be followed to carry out a CFD simulation of the combustion process in a combustor. The guidelines to be followed from the initial stage of generating the initial geometry to obtaining the results of the combustion produced inside the chamber are established. The critical aspects that must be considered during the process are highlighted, as well as the elements that posed the main difficulty for the authors during the simulation. This can be used as a guide by other authors who wish to carry out a simulation of a combustion chamber or simulations of similar characteristics.