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A Numerical Investigation on the Wake Flow Characteristics and Rear-Spoiler Effect of a Large-Sized Bus Body  

김민호 (기아자동차 상용연구소)
국종영 (기아자동차 상용연구소)
천인범 (기아자동차 상용연구소)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.11, no.2, 2003 , pp. 126-133 More about this Journal
Abstract
The aerodynamic characteristics of automobiles have received substantial interest recently. Detailed knowledge of the vehicle aerodynamics is essential to improve fuel efficiency and enhance stability at high-speed cruising. In this study, a numerical simulation has been carried out for three-dimensional turbulent flows around a commercial bus body. Also, the effect of rear-spoiler attached at rear end of bus body was investigated. The Wavier-Stokes equation is solved with SIMPLE method in general curvilinear coordinates system. RNG $k-\varepsilon$ turbulence model with the MARS scheme was used for the evaluating aerodynamic forces, velocity and pressure distribution. The results showed details of the three-dimensional wake flow in the immediate rear of bus body and the effect of rear-spoiler on the wake structure. A maximum of 14% reduction in drag coefficient was achieved for a model with a rear-spoiler.
Keywords
Aerodynamic characteristics; Bus body; Turbulent flow; Rear-spoiler; Drag coefficient;
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