Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

Nakashima, Takuji; Mutsuda, Hidemi; Kanehira, Taiga; Tsubokura, Makoto

doi:10.3390/en13246592

Cited by 7 publications

(1 citation statement)

References 36 publications

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“…In the paper by Keogh et al [2], an interesting wind tunnel solution with a moving measurement space was presented. In work by Nakashima et al [3], results of measurements performed in a pool with a controlled motion of the Ahmed model during a turn were presented. In the next work of Nakashima et al [4], the motion of a car through a curve was studied experimentally in a water tunnel and numerically.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Car Movable Aerodynamic Elements on Fast Road Car Cornering

et al. 2022

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In the case of road cars, road safety is the primary factor. The geometry of high-speed road cars has no regulatory restrictions. In addition to the high engine power and effective shape, they can use various types of additional movable aerodynamic elements to adjust their aerodynamic characteristics to the road conditions. Based on the geometry of a two-seater prototype of such a vehicle, a numerical analysis of the influence of a number of additional movable aerodynamic elements on its aerodynamic characteristics was performed. Several of them were installed on the prototype. An electronic system recording a number of motion parameters of the entire car body and some of its movable elements installed on the body was designed and built. The system has been adapted to program the motion of additional aerodynamic elements according to the set algorithms of their activation, temporarily changing the aerodynamic characteristics of the car. An experimental study of the effect of changes in the aerodynamic characteristics of the prototype on its dynamic properties during a drive through a test road section was carried out. It was shown to what extent an average driver can increase the safe speed of the curve of the road using the possibilities of moving aerodynamic elements installed on it.

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Section: Introductionmentioning

confidence: 99%

Influence of the Car Movable Aerodynamic Elements on Fast Road Car Cornering

et al. 2022

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A Theoretical and Experimental Investigation of the Effects of Inverted Wings Modifications on the Stability and Aerodynamic Performance of a Sedan Car at Cornering

Abood,

Hussain,

Ali

2024

Engineering Reports

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This research examines the impact of cornering on the aerodynamic forces and stability of a Nissan Versa (Almera) passenger sedan car by introducing novel modifications. These modifications included single inverted wings with end plates as a front spoiler, double‐element inverted wings with end plates as a rear spoiler, and incorporating the ground as a diffuser under the car trunk. The goal is to enhance the performance and stability of conventional passenger cars. To ensure the accuracy of the numerical data, the study utilized multiple methodologies to model the turbulence model, ultimately selecting the most suitable option. This involved comparing numerical data with wind tunnel experimental data using force balance and pressure distribution. Once validated, the computational fluid dynamics (CFD) was employed to analyze the vehicle's aerodynamic performance relative to the straight‐line condition under cornering conditions. The car simulation in a cornering condition was conducted at a representative Reynolds number based on the vehicle length of about 1.3 × 107. The study discovered that asymmetry was a recurring theme regarding surface pressure distribution, with greater prominence under cornering conditions. All modified models exhibited a more favorable lift‐to‐drag ratio than the baseline, indicating improved aerodynamic efficiency. The underbody double‐element diffuser proved most effective for enhancing fuel efficiency and stability. Mesh refinement with a polyhedral algorithm consisting of 11.27 million elements and a computational domain with a frontal area of 91.8 m2 and a curved length of 31 m (˜7 times car length) was crucial for achieving accurate and repeatable results. The study employed multiple turbulence models within the CFD framework. The realizable k‐ε model was chosen due to its balance between accuracy and computational cost for all Nissan Versa models. These findings are limited to the selected parameters and wind tunnel conditions, and further investigations might be needed for extreme driving scenarios.

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Aerodynamic performances and near wake of an Ahmed body under unsteady flow conditions

Moscato,

Paolo Romano

2025

Experimental Thermal and Fluid Science

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Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

Cited by 7 publications

References 36 publications

Influence of the Car Movable Aerodynamic Elements on Fast Road Car Cornering

Influence of the Car Movable Aerodynamic Elements on Fast Road Car Cornering

A Theoretical and Experimental Investigation of the Effects of Inverted Wings Modifications on the Stability and Aerodynamic Performance of a Sedan Car at Cornering

Aerodynamic performances and near wake of an Ahmed body under unsteady flow conditions

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