This master course thesis has been developed at POWERTECH Engineering S.r.l., an engineering consulting company specialized in the field of 1D and 3D CFD analysis which cooperates with several suppliers and OEMs in the automotive field. The thesis work has been made in collaboration with Bugatti-Rimac, combining off-site work in PWT premises in Turin and on-site presence in their facilities in Zagreb, Croatia. The CFD is a widely used tool in the automotive industry, since it allows to simulate the behaviour of different powertrain sub-systems, significantly reducing the issues detection during the testing phase and thus improving the time-to-market and reducing the overall costs.