Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 13 1 2023 03 21 Numerical investigating of using the air duct and body side curvature effects on the Tara aerodynamic performance Numerical investigating of using the air duct and body side curvature effects on the Tara aerodynamic performance 71 86 2797 10.22044/jsfm.2023.12654.3691 FA S. Baesmat Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran M. Pasandidehfard Prof., Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran A.R. Teymourtash Prof., Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Journal Article 2023 01 29 In the transportation industry, the vehicles aerodynamics is important because it affects on fuel consumption and stability of cars. In this numerical research by using Ansys Fluent software, the aerodynamic performance of the Iranian car Tara was investigated by creating an air duct with different dimensions and geometries in the modification of front aerodynamics and the modification of rear aerodynamics. The purpose of these changes was to establish air flow between areas of the body that have a high pressure difference, which in both aerodynamic developments reduced drag force and lift force. Also, the effect of creating side curvature on the body was also studied. The results showed that design and direction of the air flow from the sides to the back of the car is very important in aerodynamics forces, however, drag force was reduced in all cases. Finally, the best methods were combined simultaneously on the car. In the most optimal model, through the combination of the the front aerodynamic modifications and rear aerodynamic modifications the drag coefficient and lift coefficient reduced 16.3% and 4.1% respectively as the drag coefficients reduced from 0.332 to 0.278. In the transportation industry, the vehicles aerodynamics is important because it affects on fuel consumption and stability of cars. In this numerical research by using Ansys Fluent software, the aerodynamic performance of the Iranian car Tara was investigated by creating an air duct with different dimensions and geometries in the modification of front aerodynamics and the modification of rear aerodynamics. The purpose of these changes was to establish air flow between areas of the body that have a high pressure difference, which in both aerodynamic developments reduced drag force and lift force. Also, the effect of creating side curvature on the body was also studied. The results showed that design and direction of the air flow from the sides to the back of the car is very important in aerodynamics forces, however, drag force was reduced in all cases. Finally, the best methods were combined simultaneously on the car. In the most optimal model, through the combination of the the front aerodynamic modifications and rear aerodynamic modifications the drag coefficient and lift coefficient reduced 16.3% and 4.1% respectively as the drag coefficients reduced from 0.332 to 0.278. https://jsfm.shahroodut.ac.ir/article_2797_c427e37e3f5fcabc133aea2640bb08f0.pdf