On the options for bus aerodynamic profile optimization

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Aerodynamic drawbacks of intercity bus profile have become a concern since it generates a considerable large value of drag coefficient. The study aims to propose some options to improve the aerodynamic profile of the external body shape of a bus to produce a better aerodynamic performance. The adopted aerodynamic profile improvement from current aerodynamic devices from other types of vehicles has chosen to modify the external shape of a bus. The study presents the numerical value of the resulting drag coefficient and lift coefficient for each proposed bus profile modification. It compares the resulting value from the original bus model to other modified models The visual comparison of the resulting pressure coefficient around the bus, velocity contours, and resulting turbulence kinetic energy assists the readers to better understand the aerodynamic behavior of the modified bus profile. The overall comparison indicates that combining all proposed additional aerodynamic devices and reshaping the bus profile largely benefits in the drag reduction compared to the original bus model, which leads to 0.09 point of drag reduction. Each modified part positively contributes to better airflow around the bus model.