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A computational study of the aerodynamic influence on the heavy vehicle Araba body model
Roberto Garcia-Fernandez1, Vivekamanickam Koothan-Venkateswaran1, Imanol Urruchi-Gavina1
1Energy Engineering Department, School of Engineering of Vitoria-Gasteiz, University of the Basque Country, UPV/EHU, Vitoria-Gasteiz, Spain.
Abstract:
This paper presents a novel design and computational analysis for a heavy vehicle model, named the Araba body, created from the existing Ahmed body. The design was created with various parametric variations, such as the frontal height (h), rounding radius (R), diffuser height (hd), and slant angle (α). The experimental studies were validated using an existing Ahmed body. Owing to the necessary changes in these parameters, lower drag values were obtained. A Large Eddy Simulation (LES) model was used for the simulations. The vortices were obtained from all cases and analyzed along with the coefficient of drag (Cd) and pressure coefficient for the drag (Cdp). It can be seen that for 'R' of 0.3 m had the lowest coefficient of drag (Cd) of 0.12 and the pressure coefficient for the drag (Cdp) of 0.15. The rounding radius had an impact of 2.5% on both the Cd and Cdp. For the 'h' parameter, the lowest values of 0.149 (Cd) and 0.117 (Cdp) were obtained at a height(h) of 0.8 m. Similarly, for the 'hd' and 'α' parameters, lower drags are obtained at its maximum range; thus, total of 108 cases are obtained. Finally, a complete coefficient of drag (Cd) and the pressure coefficient of drag (Cdp) is obtained from all 108 computational variations. The results show great potential for enhancing the aerodynamic performance off the computed Araba body.
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