The catalytic cracking of petroleum is one of the most important processes in the oil industry. Through modeling and simulation of riser fluid catalytic cracking reactors using the software ANSYS® CFX, it was possible to analyze the production of gasoline, light gases and coke from the catalytic cracking of vacuum gas oil based on the 4-lumps kinetic model. The results obtained through computational simulations were compared with those of an industrial plant available in the literature, evaluating the reactor performance based on different variables. The influence of inlet temperature was studied. Moreover, the results showed that lower temperatures of feed inlet lead to a higher yield for gasoline whereas greater temperatures lead to a higher yield for light gases.