The different projects lead by Professors Dumas and Olivier at the LMFN focus on the use of CFD to predict and optimize the performances of various engineering systems including the production of green energy. Computational Fluid Dynamic (CFD) is a method based on the temporal and spatial discretizations of the unsteady non-linear equations governing the motion of a fluid (Navier-Stokes equations). However, the modelization of turbulence is still necessary in a majority of engineering applications (high Reynolds number) because the spectrum of dynamic structures, from the big swirls to the small dissipative structures, is too wide.