The aviation sector has reached an extremely high level and development has an almost asymptotic trend. To make this possible, simulations are carried out to provide more details of the physical knowledge about flows, bringing to the design engineers additional awareness about aerodynamic phenomena. It is of fundamental importance to have processes and software that allow you to predict performance in the best possible way during the design and analysis phases. This will lead to savings in development time and costs and performance improvement. The main objective of this thesis is to create a set of models, from one-dimensional to full 3D, of the turbines of an existing turboprop engine using more recent methodologies in a sort of reverse engineering.