Aerodynamic Investigation Of A Commercial Vehicle Using CFD

Mohd Fadhlan, Zahari (2008) Aerodynamic Investigation Of A Commercial Vehicle Using CFD. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Air poses high aerodynamic resistances over a commercial vehicle due to their box-looked shape and large surface area. However, there is a room to reduce the air resistance so that the fuel consumption and stability of the vehicle can be enhanced. The Computational Fluid Dynamic (CFD) appears to be a good approach since it can serve as a virtual wind tunnel and can give more detail information rather than physical wind tunnel. Hence this project revealed the external flow analysis over a commercial vehicle by means of CFD method to gain further detail aerodynamic characteristics. The one-equation Spalart Allmaras model was chosen as it is widely used in automotive industry and can give appropriate results as other 2-equation model. A commercial vehicle model with scaled 1:87 was aerodynamically tested in a low speed wind tunnel to verify numerical model. The results showed that the pressure drag is dominant rather than skin drag by number of ratio 0.949. Besides, the locations of the separations along the model were manipulated to be visualized and it gave good agreement to experimental.

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