Subodh Kumar Ghimire.et.al Int. Journal of Engineering Research and Application www.ijera.com ISSN : 2248-9622, Vol. 6, Issue 9,(Part-5) September.2016, pp.33-38 www.ijera.com 33|Page Performance Study of Wind Friction Reduction Attachments for Van Using Computational Fluid Dynamics Subodh Kumar Ghimire, a* , David Gyawali, b D. Krishna Mohan Raju c , a PG Scholar (CAD/CAM), SVCET, Chittoor, A.P., India b G Scholar (Mechanical), SVCET, Chittoor, A.P., India c Vice-Principal (Academic), SVCET, Chittoor, A.P., India ABSTRACT Road transport is the key factor as it is the major method to connect places through land. Along with wide use of internal combustion engines for this purpose comes the massive consumption of fossil fuels by vehicles. Most of the research today is toward making efficient machines. This paper mainly deals with providing attachments to existing models of vehicle to make it more efficient. An assessment of the impact of aerodynamic drag and its relationship to energy consumption presented. A few models are designed and analysed for reducing drag with the help of Attachments. Solid works is used to model and ANSYS Fluent is used for CFD analysis. The results of Cd of various configuration is analysed, 0.427 being the Cd for conventional Van is reduced to 0.234 for van with front and rear attachment. Keywords: Computational Fluid Dynamics, Drag, Aerodynamics, Collapsible Attachments, Coefficient of Drag, ANSYS Fluent I. INTRODUCTION Main purpose of vehicle is the safe, comfortable, quick and efficient transportation of passengers and belongings. In growing economy vehicle plays a vital role in its growth. In today’s vehicle we can clearly view the optimization in various energy consuming sections, in same story we can also account for partial aerodynamics for a significant fuel economy. The layout of current commercial vehicle design is governed primarily by their functional requirements. They still have a lots of areas for proper improvements and optimization. It can also be seen that attention given to aerodynamic profile of a vehicle is conventional. By opening a new door of dynamically shape changing vehicle, we can explorer deep into it with significant outcomes. The collapsible aerodynamic design is mainly a dynamic solution for different modes of a vehicle. It provides a window of opportunity for the vehicle to have normal ride in city drive mode, and to have highly efficient drive with attachments in highways. For the purpose of analysis, Vehicle body with and without attachments are modelled in Solidworks-14. The model thus prepared is directly applicable in ANSYS Fluent.Variant of Curved profile attachment is considered in simulation. Mainly there are 3 modifications and its combination for different calculation viz., pointed ends, truncated end and flat top II. LITERATURE REVIEW R. B. Sharma, Ram Bansal (2013) generated a generic model of typical passenger car, wind tunnel and applied boundary condition in ANSYS workbench, there after model was simulated and tested to gain baseline. Another model with tail-plate was also subjected to same configuration resulting the change in value of Cd and thus provided evidence that tail plate can improve aerodynamics and fuel economy of the vehicle. (Sharma & Bansal, 2013) Damjanović, Darko et al., (2010) Used Ansys Fluent to simulate and analyze conceptual car for aerodynamic improvement. Car was designed using Autodesk 3ds Max 2010. Designed car was derived from freeform sketches through imagination. Final digital images were generated through Mental Ray rendering. External surface of the car was only modeled, and by the use of ANSYS FLUENT, 2D analysis of the side contour of the vehicle was done, further correction of exterior geometry was done in order to improve the design of vehicle in terms of reducing aerodynamic drag and air resistance. (Damjanović, 2010) Chainani. A, Perera. N (2008) analysed the present state of art for racing vehicles. This study of air flow over the body shows that drag force unfavourably disturbs the accelerative motion of the car and there is an alteration in the pressure among the air flowing overhead and underneath the vehicle. This produces the vertical forces. Aerodynamic forces executing upon a car prominently reduces its effectiveness. If the car is redesigned to enhance these forces it could always generate better results. The paper deliberates various methods that have been castoff to restructure and optimise the aerodynamics of a radio control race car. (Chainani & Perera, 2008) RESEARCH ARTICLE OPEN ACCESS