Starting from the past decades, many engineering domains require an accurate knowledge of Fluid Dynamics problems. Possible examples are car and airfoil designing in the automotive and aeronautics fields, blood circulation through the cardiovascular system in bioengineering or the evaluation of wind turbines efficiency in the energetic field. The first historical way to better understand a physical phenomena was to perform as much as possible experiments and to take decisions based on their results. However, sometimes the studied systems are characterized by big length or time scales and, as a consequence, experiments can be very expensive or even not possible to make.