CFD analysis on passenger car model for drag reduction / Lim Chee Hong, M. Govardhan and Mohammed Kamel Wan Ibrahim

Lim, Chee Hong and Govardhan, M. and Wan Ibrahim, Mohammed Kamel (2006) CFD analysis on passenger car model for drag reduction / Lim Chee Hong, M. Govardhan and Mohammed Kamel Wan Ibrahim. In: Volume No. 1: Science and Technology, 30 – 31 May 2006, Swiss Garden Resort & Spa Kuantan, Pahang.


The aerodynamic drag experienced by a vehicle is related to the structure of the flow in its wake. Hence experimental and computational studies are initiated on a typical passenger car. Wind tunnel testing and CFD analysis was performed on a 1/6 scale model of a Mercedes-Benz C45 model complete with 77 pressure tappings on the centerline contour. Accuracy of the model was preserved with fine details such as mirrors, bumpers, sides trips and wheel housing. The vehicle yaw angle was varied from +15° to -15° and was shown to have a strong influence on the flow characteristics. Flow visualization via wool tuft technique at various yaw angles enabled the visualization of vortex formation along the A-posts and turbulence with flow separation at the rear end of the vehicle. Drag force was measured using experimental methods which yield drag coefficient values close to manufacturer claims. Extensive pressure measurements along the centerline including the front and rear diffuser area showed change in stagnation areas as the yaw angle of the car was increased. Data indicated well attached flow up to the top of the front screen. Stagnation points were visible at the front bumper area with flow separation starting at the end of the roofline. Experimental data was then compared with CFD software (COSMOS-FLOWORKS 2004) utilizing time dependent Navier-Stokes equations. The pressure distribution on the car surface correlated well with wind tunnel data.


Item Type: Conference or Workshop Item (Paper)
Email / ID Num.
Lim, Chee Hong
Govardhan, M.
Wan Ibrahim, Mohammed Kamel
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > Aeronautics. Aeronautical engineering > Wind tunnels
Divisions: Universiti Teknologi MARA, Pahang > Jengka Campus
Journal or Publication Title: Proceedings Of The National Seminar On Science, Technology And Social Sciences
Event Title: Volume No. 1: Science and Technology
Event Dates: 30 – 31 May 2006
Page Range: pp. 599-605
Keywords: Aerodynamics, CFD, drag coefficient, flow separation, wind tunnel test and pressure coefficient
Date: 2006
Edit Item
Edit Item


[thumbnail of 81862.PDF] Text

Download (5MB)

ID Number




Statistic details