Analysis of the influence of the rear end sedan vehicle profile on the aerodynamic efficiency

When the fluid flows over the surface, the surface will resist its motion and this is called drag. Aerodynamic drag is the sum of pressure drag and viscous drag. This research will focus on how rear end parameters will affect the drag coefficient of the sedan car. Although drag coefficient will not give a big effect towards the rear end of the vehicle in comparison to the front end, this research focuses its initial stages in studying what is the effect of rear end drag if present.16 common sedan vehicle models from the different segments are measured at the rear end profile to determine the maximum and minimum range of the rear end parameters. Seven rear end design parameter will be used in the designing process while the front end data is taken from previous researches. Using the DoE Central Composite Design(CCD) sampling, 79 units of car models were designed using CATIA software. The ANSYS software will be used in this research to identify the rear end parameters that will give the lowest drag coefficient value. From the findings, the lowest Cd value was 0.22495.