The present thesis is dedicated to the study of turbulent flows inside an aeronautical engine turbine by means of Large-Eddy Simulation (LES). For many decades, the turbomachinery flow has been one of the main focuses of research in the Computational Fluid Dynamics (CFD). The significant developments achieved in aero-engines performances have brought to different complex geometries and flows being employed. Thus, there is a greater need for high fidelity simulations to be performed in order to reach a certain level of accuracy and quality in the design and optimization processes of such flows. Due to its reduced computational cost with reference to Direct Numerical Simulations (DNS) and much higher accuracy if compared to RANS, the LES approach has become a very powerful analysis tool in many engineering fields nowadays.