Combustion study is the branch of science that deals with the study of combustion processes, which are chemical reactions that release energy in the form of heat and light. Combustion is a critical process that occurs in a wide range of applications, including internal combustion engines, power generation, industrial heating, and propulsion systems. CFD can be used to simulate and analyze combustion processes in order to optimize the performance and efficiency of these systems. CFD simulations can be used to predict the behavior of the combustion gases, including temperature, pressure, and velocity, as well as the distribution of pollutants. This can be used to design and optimize combustion systems, including combustion chambers, burners, and exhaust systems, with the goal of reducing emissions and increasing efficiency. Additionally, CFD simulations can be used to study the behavior of fires, providing insight into how to prevent and control them. CFD can also be used to study and predict the behavior of combustion-related phenomena such as flame propagation, ignition, and extinction, multi-phase systems, such as droplets and sprays, and combustion-related pollutants, such as NOx, SOx, and particulate matter. Overall, CFD is a powerful tool that can provide valuable insights into combustion processes, helping to improve the performance, efficiency, and environmental impact of combustion systems.