Comparative Assessment of Aerodynamic Forces Generated Due to Wind Deflector of Passenger Car by CFD and Experimental Method

Aerodynamics is a branch of Fluid dynamics concerned with studying the motion of air, its interaction with a solid object, such as an airplane wing, automobile body etc. Aerodynamic of passenger car model by comparing experimentally and subsequent validation by computational fluid dynamics (CFD) without and with the use of wind deflectors has been done. The experimental investigations was performed on an open circuit suction type wind tunnel having a 30 cm x 30 cm x 100 cm test section, and maximum speed of 35 m/s on a geometrically similar, reduced scale (1:15) Wood car models .while the three dimensional computational analysis was carried out using with the help of software tools like ANSYS-FLUINT to simulate the flow of air around the automobiles ANSYS-FLUINT, CFD code were used to run the simulation. The objective of the study is to predict the drag coefficient experimentally as well as computationally. As the drag force has direct dependence on the economy of vehicle, drag force will be calculated by CFD and Wind tunnel experiment. Several factors that influence the drag coefficient such as flow separation, vortex and the effect of pressure coefficient have been studied. Detail velocity profile and pressure distribution plots around the car envelopes have been presented.