Experimental and Numerical Study of Unsteady Wakes Behind an Oscillating Car Model

Guilmineau, Emmanuel; Chometon, F.

doi:10.1007/978-1-4020-9898-7_32

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…RANS methods are also widely used in the automotive sector. Guilmineau and Chometon [47], Ryan and Dominy [58] and Juhlin and Eriksson [59] represent studies using generic car configurations to investigate cross-wind effects.…”

Section: Reynolds-averaged Navier-stokesmentioning

confidence: 99%

“…The focus, here, is to mimic as much as possible realistic conditions, which is the motivation to include gusts in the determination of the aerodynamic coefficients [47]. The motivation to take into account gusts for road vehicles stems from the vital interest to determine not only the risk of overturning but also the risk of side-slip and related counter steering, which is a function of the time-dependent forces and moments acting on the vehicle.…”

Section: Computational Techniquesmentioning

confidence: 99%

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Cross-wind effects on road and rail vehicles

Baker

Cheli

Orellano

et al. 2009

Vehicle System Dynamics

156

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This paper presents a review of recent research that has been carried out on the cross-wind effects on road and rail vehicles. After a brief introduction to the issues involved, the risk analysis framework is set out. All risk analysis methods require some knowledge of cross-wind aerodynamic force and moment coefficients, and methods of obtaining these through full scale and wind tunnel testing and through Computational Fluid Dynamics methods are then described. The picture of the flow fields around vehicles that is suggested by these measurements and calculations is then presented, and the steady and the unsteady aerodynamic force characteristics described. The detailed methodology for using this information to predict accident risk is then set out, including details of the vehicle dynamics system models that can be used. Finally potential alleviation methods are described and suggestions made for further works.

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Section: Reynolds-averaged Navier-stokesmentioning

confidence: 99%

Section: Computational Techniquesmentioning

confidence: 99%

Cross-wind effects on road and rail vehicles

Baker

Cheli

Orellano

et al. 2009

Vehicle System Dynamics

156

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show abstract

“…The Ahmed body was at first put forward by Ahmed et al (1984). is a general car model which is used by the automotive industries (Morel (1978), Good and Garry (2004), Guilmineau and Chometon (2009), Heft et al (2012) and Huminic and Huminic (2012)), to examine the wake forces and dynamics which is experienced in a verity of configurations. The Ahmed body is designed to have a smooth-edged front end with a flat roof and a flat bottom section and an angled back slant which basically acts as the rear window of a car and ending with a vertical base.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Study of an Ahmed Body with the Help of CFD Simulation

Saha¹,

T²,

Saha³

et al. 2020

Preprint

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Automotive aerodynamics comprises of the study of aerodynamics of road vehicles. Its main goals are reducing drag, minimizing noise emission, improving fuel economy, preventing undesired lift forces and minimizing other causes of aerodynamic instability at high speeds. The Ahmed body has the form of a highly simplified car, consisting of a blunt nose with rounded edges fixed onto a box-like middle section and a rear end that has an upper slanted surface, the angle of which can be varied. It retains vital features of real vehicles in order to study the flow fields around it and the related turbulence models which characterizes the actual flow at elevated Reynolds number. In the present study, the aerodynamic behavior of this body is investigated numerically by the aid of commercial CFD tool: Ansys Fluent. The results of the simulation are validated with available experimental data and results of the simulations from other literatures. The numerical data were obtained for a fixed free stream velocity of 25 m/s at the inlet. The simulations were performed at a fixed slant angle of 25 degree and zero yaw angle. The present study focuses on how local refinement of mesh inside the concerned body and the outside, helps affect the results and for which grid dependency test is the primary objective of this paper. The present study also helps demonstrate how the drag of the body behaves, which is mainly the effect of pressure drag force generated at the rear portion of the body. The study also focuses on important properties like the velocity magnitude at different locations for different meshing cases, and to capture the flow pattern in the front or near the wake region. The study can be further helpful to future researchers in determining resistance, fuel efficiency etc. helping designers to optimize in specialized areas for better efficiency.

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Exploration and Improvement of Road Vehicle Aerodynamics using LES

Krajnović¹

2011

SAE Technical Paper Series

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Experimental and Numerical Study of Unsteady Wakes Behind an Oscillating Car Model

Cited by 3 publications

References 13 publications

Cross-wind effects on road and rail vehicles

Cross-wind effects on road and rail vehicles

Aerodynamic Study of an Ahmed Body with the Help of CFD Simulation

Exploration and Improvement of Road Vehicle Aerodynamics using LES

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