This master’s thesis investigates the impact of the inlet boundary conditions on the spatial evolution of the turbulence injected using a library-based method. The free-stream turbulence inflow data has been generated with a precursor approach through the Direct Numerical Simulation (DNS) of a Decaying Homogeneous Isotropic Turbulence (DHIT). Numerical studies have been carried out using the solver ArgoDG, developed at Cenaero, which is based on a high-order discontinuous Galerkin method. Firstly, a parametric study was conducted in a free domain to assess the influence of various simulation parameters (i.e. Reynolds number, Mach number, injection angle, type of boundary conditions and mesh) on the properties of a freely decaying turbulence.