Anwar bin Mohd Sood2024-10-082024-10-082016https://studentrepo.iium.edu.my/handle/123456789/7470This dissertation studies the drag reduction of passenger cars with pushed-in rear door and rear bumper to improve aerodynamics and thus fuel efficiency. Drag reduction was focused on modifications of the surface at the bottom rear side profile of a passenger car in order to maintain attached flow across the sides of the body and a smaller wake size at the rear of the car. A simplified car model was used to represent a typical passenger car. The flow over the car model was simulated in Computational Fluid Dynamics (CFD) software Star-CCM+ to obtain the drag coefficient. Parametric studies were performed in order to determine the best drag reduction configuration. Significant reduction of drag by 4.7% was achieved with the combination of a pushed-in rear door and rear bumper. Combination of both strategies should be made carefully so that early flow separation will not occur on the side rear bumper.enCopyright International Islamic University MalaysiaDrag (Aerodynamics)AerodynamicsMaster Thesishttps://lib.iium.edu.my/mom/services/mom/document/getFile/WBG1a2adgUAEfkiT5TX7rV1BPB6hCfmW20161103123620953