Abstract
In this study, the effects of classical side mirrors and side-view cameras on the aerodynamic drag coefficient of a city bus model were investigated with Computational Fluid Dynamics (CFD). The surface profile of 1/5 scale bus was modeled with CATIA v5 program. Aerodynamic analyzes were per-formed with ANSYS Fluent® v18. Reynolds Average Navier-Stokes (RANS)-based Reynolds Stress Model (RSM) was used as the turbulence model. The ground effect was taken into consideration in all analyzes. The solution do-main for 5% blockage ratio was created. Inflation layers are used on the ve-hicle surface regarding velocity changes due to viscous effects. The mesh number independence of analyzes was examined for the bus model without side mirrors and provided for 1.3 M mesh element. The Reynolds number in-dependence of the analysis was investigated by using the optimum number of mesh. Free flow velocity of 90 m/s and above were found to be adequate for Reynolds number independence. The drag coefficient was calculated for the bus with side mirrors by using optimum mesh and wind speed as well. The drag coefficients for the bus with side mirrors and side view cameras were de-termined 0.53 and 0.521 respectively.
Highlights
In this study, the effects of classical side mirrors and side-view cameras on the aerodynamic drag coefficient of a city bus model were investigated with Computational Fluid Dynamics (CFD)
Aerodynamics is a branch of physics that studies the in- cles, various drag reduction methods have been used
The aim of this paper is to investigate drag coefficient of a city bus by putting the place of the side-view mirrors for cameras placed in housing
Summary
The effects of classical side mirrors and side-view cameras on the aerodynamic drag coefficient of a city bus model were investigated with Computational Fluid Dynamics (CFD). The prop- el drag reduction method for automotive mirrors using paserties of the fluid flow around the parts, such as the mirror, sive jet flow control This method found to be effective both the wheel, and the lids on the bus, play an important role in wind tunnel testing with PIV and CFD large eddy simulaincreasing aerodynamic drag. Aerodynam- reducing the truck rearview mirror drag using passive flow ic analyses are carried out to control the change of drag by control jet boat tail (JBT) technique. They reported that the taking precautions against drag force and power losses wind tunnel testing measured a drag reduction of 10.1% due caused by the acceleration of vehicles. As a result of the experiments, they observed that the change was less than 1%, that is, independent of the Reynolds number
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