scholarly journals Numerical Study on Aerodynamic Drag Reduction of an Urban-Concept Car for Energy-Efficient Competition

2018 ◽  
Vol 220 ◽  
pp. 02001
Author(s):  
Himsar Ambarita ◽  
Munawir R Siregar
Keyword(s):  
Drag Reduction ◽  
Numerical Method ◽  
Energy Efficient ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Three Dimensional ◽  
Original Design ◽  
Pressure Distributions ◽  
Aerodynamic Drag Coefficient ◽  
Aerodynamic Drag Reduction

The present work deals with aerodynamic drag reduction of an urban-concept car for energy-efficient competition. Several modifications have been proposed to the original design of the urban-concept of the car. In order to investigate the effect of the proposed modifications numerical method has been developed. In the numerical method three-dimensional governing equations have been solved numerically. Turbulent flow is modeled using k-epsilon model. The two designs have been simulated at five different inlet velocities. The inlet velocity varies from 10 m/s to 20 m/s. The velocity contour, velocity vector and pressure distributions have been plotted. The results show that the proposed modifications improve the performance of the proposed design. At the given inlet velocities, the aerodynamic drag coefficient of the new design decreased 26.63 % in comparison with original design. It is recommended to modify the original design of the urban concept car by implementing the proposed modifications. The new design will improve the performance of the urban concept car.

scholarly journals Numerical Study of the Generic Sports Utility Vehicle Design with a Drag Reduction Add-On Device

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Shubham Singh ◽  
M. Zunaid ◽  
Naushad Ahmad Ansari ◽  
Shikha Bahirani ◽  
Sumit Dhall ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Fuel Efficiency ◽  
Ansys Fluent ◽  
Mean Pressure ◽  
Aerodynamic Drag Coefficient ◽  
Total Base ◽  
Aerodynamic Parameters

CFD simulations using ANSYS FLUENT 6.3.26 have been performed on a generic SUV design and the settings are validated using the experimental results investigated by Khalighi. Moreover, an add-on inspired by the concept presented by Englar at GTRI for drag reduction has been designed and added to the generic SUV design. CFD results of add-on model and the basic SUV model have been compared for a number of aerodynamic parameters. Also drag coefficient, drag force, mean surface pressure, mean velocities, and Cp values at different locations in the wake have been compared for both models. The main objective of the study is to present a new add-on device which may be used on SUVs for increasing the fuel efficiency of the vehicle. Mean pressure results show an increase in the total base pressure on the SUV after using the device. An overall reduction of 8% in the aerodynamic drag coefficient on the add-on SUV has been investigated analytically in this study.

Vehicle Aerodynamic Drag Reduction Using Air Jet System

2017 ◽  
Author(s):  
SangWook Lee
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
State Of The Art ◽  
Sensitivity Study ◽  
Air Jet ◽  
Aerodynamic Drag Coefficient ◽  
Parametric Studies ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Aerodynamic Drag Reduction

Study on the air jet wheel deflector system using state-of-the-art of Computational Fluid Dynamics (CFD) technique based on an open domain CFD software (OpenFOAM) is performed to reduce vehicle aerodynamic drag. Fabijanic’s simple vehicle model [1] is used for both the mesh sensitivity study and validation of current CFD technique. It was found that CFD method used in this study is reliable tool for the forecasting of the aerodynamic drag coefficient. Parametric studies were conducted to investigate aerodynamic effects of the conventional wheel deflector and air jet wheel deflector system. For the conventional wheel deflector, 3.6% of drag reduction was achieved with a non-dimensional deflector height of 1/6, but the drag force tends to increase as the non-dimensional height increased. On the other hand, it was shown that air jet wheel deflector system can reduce vehicle aerodynamic drag up to 7.5% at the non-dimensional air jet velocity of 1.0. Therefore it would be concluded that air jet wheel deflector is a useful device to reduce aerodynamic drag of automobile.

scholarly journals Numerical Study on Aerodynamic Drag Reduction of Racing Cars

2014 ◽  
Vol 90 ◽  
pp. 308-313 ◽  
Author(s):  
S.M. Rakibul Hassan ◽  
Toukir Islam ◽  
Mohammad Ali ◽  
Md. Quamrul Islam
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Aerodynamic Drag Reduction

Aerodynamic Drag Reduction of SUV Based on Underbody Cover Board

2014 ◽  
Vol 602-605 ◽  
pp. 477-480
Author(s):  
Jing Yu Wang ◽  
Bao Yu Wang ◽  
Xing Jun Hu ◽  
Lei Liao
Keyword(s):  
Flow Field ◽  
Drag Reduction ◽  
Drag Coefficient ◽  
Aerodynamic Drag ◽  
Flow Line ◽  
Wind Tunnel Test ◽  
Aerodynamic Performance ◽  
Simulation Based ◽  
Aerodynamic Drag Coefficient ◽  
Aerodynamic Drag Reduction

The principles and method of computational fluid dynamics were applied to numerical simulate the external flow field about the SUV model. The hybrid mesh of tetrahedral and triangular prismatic as well as the turbulence model of Realizable k-ε was adopted to study the flow field of SUV of flat underground. Then the SUV of complex underground was simulated with the same mesh strategy and boundary condition. The aerodynamic drag coefficient of latter was bigger than former. That illuminated the complex underground has affect to aerodynamic performance of vehicle. The wind tunnel test validated the veracity of numerical simulation. Based on that, the underground cover board was appended; the aerodynamic drag coefficient was depressed. The velocity and pressure distribution and flow line were achieved. The conclusions provide theoretical reference for the further study of aerodynamic drag reduction of complex underground.

A Study of an Active Rear Diffuser Device for Aerodynamic Drag Reduction of Automobiles

2012 ◽  
Author(s):  
Seung-On Kang ◽  
Jun-Ho Cho ◽  
Sang-Ook Jun ◽  
Hoon-Il Park ◽  
Ki-Sun Song ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
Aerodynamic Drag Reduction
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