82 Journal of Advances in Vehicle Engineering 2(2) (2016) 82-93 www.jadve.com Design and analysis of a new Sedan Car: Analysis from Aerodynamic Perspective Roopsandeep Bammidi a* , B.V.Ramana Murty b a Department of Mechanical Engineering, RAGHU Engineering College, Dakamarri Village Rd, Dakamarri, Andhra Pradesh 531162, India b Department of Mechanical Engineering, Gayatri Vidya Parishad College of Engineering (A), Madhurawada, Visakhapatnam-530048, India (Manuscript Received: 12 May 2016; Revised: 11 Jun 2016; Accepted: 16 Jun, 2016) Abstract People demand more efficient road vehicles by the effect of global climate change and increasing the fuel prices. The road vehicles must be obtained with much more performance pertaining within the standard rules. The reduction of drag coefficient is a major target in the industries of automobiles due to its inter-relation with the reduction of fuel consumption. The fuel economy is major concern in the development of automobiles, for the resources of energy conservation and global environment protection. The drag force reduction is a necessary process in road vehicle aerodynamics for the improvement of fuel consumption and also driving performance of the vehicles. In the present scenario, there are plenty of software tool packages that made it easy for the students, engineers and the designers to dis- play the concepts and to describe an idea of imagination in better sense and quality. In this research paper an attempt is made to study the Aerodynamic properties on passenger car model, the Sedan. The attention is paid only to the exterior design and interior is not modeled. The part modeling is done in CATIA V5 R19 which is a backbone tool used for product development processes in industries. Analysis is performed on this model at various speeds such as 60 kmph, 80 kmph, 130kmph and 165kmph. The study is focused on the coefficients and forces in case of lift, side and drag, velocity streamlines and turbulent flows. The ANSYS CFX 15.0 which is a commercial CFD tool used for the analysis. The main source of air resistance of this model is drag which is to reduce it for better fuel consumption. The Nu- merical calculations have been carried. This work gives the brief idea about aerodynamic properties of Passenger car which seems to be simple automobile design. The research work fetched in geometrical corrections and improvement of aerodynamics to develop a new model which might achieve a better fuel economy Keywords: CFD; Passenger Car; Sedan; Fuel Consumption; ANSYS; CATIA ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 1. Introduction Fuel consumption of automobile is related to its aerody- namic drag which is highly influenced by the separation flows around its shape. The human activities became major cause in increasing the greenhouse effect of gases and also the average global temperature. The activity that includes transportation sector where number of automobile is rapidly increasing and also increases the fuel consumption. It tends to create harmful effects on environment by increasing air pollution. Because of these problems, the automobile industries try to minimize the greenhouse effect by using efficient fuel consumption. The automotive industry uses the CFD package which is a com- mercial tool. The CFD is not only used for the improvement of vehicle aerodynamics, but also for domain optimization like brake cooling, lighting, engine cooling, fuel system and air- bags. While the product development of new road vehicles, leads to understanding the phenomenon of flow behavior and also the aerodynamic forces that are influenced by the changes in aesthetic shape of the vehicle body. The CFD is best way for the designers to obtain the results in a short interval of time. The object of aerodynamic research is to minimize the re- sistance of the aerodynamics to allow the faster running for the same energy consumption or the lower consumption for the same speed. The performance of vehicle aerodynamics is mainly determined by the co-efficient of the drag which di- rectly effects the fuel consumption and engine requirements. In the industries of motor vehicles, aerodynamics plays a very important role and the car manufacturers around the world had been fascinated and influenced by the various improvements in the aerodynamics. There had been a constant effect to in- corporate changes in road vehicles, not just as an aesthetic design feature but also contribute to improve vehicle handling and the fuel economy. Aerodynamics is the study related to flow of air particles around a body such as airplanes, cars and motorcycles at lower or higher speeds. The forces of aerody- namics will be generated if there is a flow of air over the body. The forces of aerodynamics include pressure distributions and shear stress distributions over the body. With respect to pres- sure distribution over body, drag force and lift force are occur- ring. Theory of Bernoulli says that the flow of high speeds on the area makes low pressure on that area and flow of low speeds on the area makes the area have high pressure. Air flow over the Ahmed body is investigated by means of transient RANS turbulence models [1]. The performance of several RANS turbulence models has been compared. It has been found that Durbins k-€-v 2 model is more accurate than the other turbulence models for the wall- bounded cases with separation and reattachment. Tastan [2] studied reliability and the turbulence model per- formances by CFD software to determine the passenger car aerodynamics that are tested and compared. In this analysis, * Corresponding author. R Bammidi (*) Department of Mechanical Engineering, RAGHU Engineering College, Dakamarri Village Rd, Dakamarri, Andhra Pradesh 531162, India e-mail: roopsandeepbammidi@gmail.com