The influence of distance between vehicles in platoon on aerodynamic parameters

Gnatowska, Renata; Sosnowski, Marcin

doi:10.1051/epjconf/201818002030

Cited by 16 publications

(15 citation statements)

References 12 publications

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“…They showed that the increase in drag of the follower of two in-line Ahmed bodies is due to significant changes in the wake structure between the bodies, as spacing ratio increased from 0.5 to 1.0. Gnatowska and Sosnowski [27] also made similar conclusions based on results from experiments and Reynolds Averaged Navier-Stokes (RANS)-based turbulence modelling. In a recent study, Murzyn et al [10] performed detailed two-dimensional (2D) laser Doppler velocimetry (LDV) measurements of the wake structure between two Ahmed bodies using six spacing ratios ranging from 0.25 to 1.53 and three slant angles, α = 0 • , 25 • and 35 • .…”

Section: Introductionsupporting

confidence: 56%

Effects of Rear Angle on the Turbulent Wake Flow between Two in-Line Ahmed Bodies

2020

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Understanding the wake characteristics between two in-line vehicles is essential for improving and developing new strategies for reducing in-cabin air pollution. In this study, Ahmed bodies are used to investigate the effects of the rear slant angle of a leading vehicle on the mean flow and turbulent statistics between two vehicles. The experiments were conducted with a particle image velocimetry at a fixed Reynolds number, R e H = 1.7 × 10 4 , and inter-vehicle spacing distance of 0.75 L , where H and L are the height and length of the model. The rear slant angles investigated were a reference square back, high-drag angle ( α = 25 ° ) and low-drag angle ( α = 35 ° ). The mean velocities, Reynolds stresses, production of turbulent kinetic energy and instantaneous swirling strength are used to provide physical insight into the wake dynamics between the two bodies. The results indicate that the recirculation region behind the square back Ahmed body increases while those behind the slant rear-end bodies decreases in the presence of a follower. For the square back models, the dominant motion in the wake region is a strong upwash of jet-like flow away from the road but increasing the rear slant angle induces a stronger downwash flow that suppresses the upwash and dominates the wake region.

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Section: Introductionsupporting

confidence: 56%

Effects of Rear Angle on the Turbulent Wake Flow between Two in-Line Ahmed Bodies

2020

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“…Advances in aerospace, power engineering [19,20], automotive [21,22], civil engineering [6,23,24], medicine [25,26] and other numerous branches of the industry could not have been achieved without the application of computational methods as a research tool. The primary and critical activity in numerical modelling is the computational domain discretization.…”

Section: Computational Domain Discretizationmentioning

confidence: 99%

Numerical Analysis of Flow in Building Arrangement: Computational Domain Discretization

et al. 2019

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The progress in environmental investigations such as the analysis of building arrangements in an urban environment could not have been expanded without the use of computational fluid dynamics (CFD) as a research tool. The rapid development of numerical models results in improved correlations to results obtained with real data. Unfortunately, the computational domain discretization is a crucial step in CFD analysis which significantly influences the accuracy of the generated results. Hence an innovative approach to computational domain discretization using polyhedral elements is proposed. The results are compared to commonly applied tetrahedral and hexahedral elements as well as experimental results of particle image velocimetry (PIV). The performed research proves that the proposed method is promising as it allows for the reduction of both the numerical diffusion of the mesh as well as the time cost of preparing the model for calculation. In consequence, the presented approach allows for better results in less time.

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“…The research performed concerns the application of the above ical methods to investigate the drag coefficient of a vehicle model. Research into aerodynamic parameters of a single vehicle as well as arrangement of subs quent vehicles driving in a so-called platoon are carried out in the automotive o reduce the fuel consumption and in consequence increase the efficiency of the analyzed design [17]. Therefore research dedicated to the estimation of the influence of computational domain discretization on CFD results concerning the aerodynamics of a vehicle are purposeful.…”

Section: A)mentioning

confidence: 99%

“…The research object is a vehicle model described in [17] and commonly called the AHMED body. It is one of the most popular models used as a simplified vehicle shape to predict the fundamental flow physics associated with a vehicle wake.…”

Section: The Numerical Setupmentioning

confidence: 99%

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The influence of computational domain discretization on CFD results concerning aerodynamics of a vehicle

Sosnowski¹

2018

J. Appl. Math. Comput. Mech.

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Abstract. The paper presents research concerning the influence of computational domain discretization on the results of CFD analysis. Tetrahedral and polyhedral numerical mesh types are analyzed and the mesh convergence index is calculated. The obtained results are compared to the experimental measurements concerning the estimation of drag coefficient of the vehicle model. The research carried out indicates the great influence of pre-processing on the reliability of the obtained results. Moreover, the advantages of polyhedral mesh over tetrahedral mesh are pointed out in the paper.MSC 2010: 76G25, 76M25

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The influence of distance between vehicles in platoon on aerodynamic parameters

Cited by 16 publications

References 12 publications

Effects of Rear Angle on the Turbulent Wake Flow between Two in-Line Ahmed Bodies

Effects of Rear Angle on the Turbulent Wake Flow between Two in-Line Ahmed Bodies

Numerical Analysis of Flow in Building Arrangement: Computational Domain Discretization

The influence of computational domain discretization on CFD results concerning aerodynamics of a vehicle

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