Improvement of the aerodynamic behaviour of the passenger car by using a combine of ditch and base bleed

The current study investigates different methods to minimize the drag coefficient ( C D ) without ignoring the safety factor related to the stability of a vehicle, i.e., the lift coefficient ( C L ). The study was carried out by employing an SUV car analyzed numerically using one of the CFD software, Ansys. Four different models such as realizable k–ε , standard k–ω , shear stress transport k–ω , and Reynolds stress model (RSM). The considered models have been validated with experimental data and found in good agreement. The considered inlet velocity varies from 28 to 40 m/s, the results showed that the drag coefficient and the stability are both improved by applying a modification on the roof of the considered car.