1. Introduction
Numerical computational aerodynamic studies represent a significant part in the design and optimization of car bodies. Research carried out using numerical methods [5] [6] are relatively fast and inexpensive compared with tunnel research. Based on numerical methods of calculation it is possible to simulate any ambient conditions, referred to as boundary conditions, and visualize the distribution of parameter values, as desired, for example, the pressure distribution on the surface of the vehicle or the air speed distribution in the plane coinciding with the plane of symmetry of the car. Numerical investigations [5] [6] provide high accuracy data, depending on the developed numerical model.