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.