Aerodynamics of Road Vehicles

Hucho, W; Sovran, G

doi:10.1146/annurev.fl.25.010193.002413

Cited by 331 publications

(183 citation statements)

References 46 publications

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“…In contrast to using force balances and pressure taps, a wake rake offers the advantage of yielding additional whole-field velocity information in the model's wake. The identification of the streamwise vortical structures behind cars, for instance, has been among the most significant insights in vehicle aerodynamics in the past decades (Hucho and Sovran 1993). Furthermore, relating changes in the leg orientation of a cyclist to the wake flow topology recently provided new insights for cycling aerodynamics (e.g.…”

Section: 83 Page 2 Of 14mentioning

confidence: 99%

Aerodynamic drag of a transiting sphere by large-scale tomographic-PIV

2017

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Section: 83 Page 2 Of 14mentioning

confidence: 99%

Aerodynamic drag of a transiting sphere by large-scale tomographic-PIV

2017

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“…One way is to reduce aerodynamic drag, which is responsible for the largest part of the fuel consumption for speed above 80 km h -1 (Hucho 1998). Like bluff-body, automotive drag is mainly governed by massive separation on the rear part: for a typical family car, pressure drag on this area can reach near a third of the total aerodynamic drag (Barnard 1996).…”

Section: Introductionmentioning

confidence: 99%

“…As this angle evolves from 0°to 90°, the near wake of the Ahmed bluff-body changes drastically. From 12°to 15°, the flow is typical of a rear blunt with a flow separation on rear edges, generating mainly transverse vorticity: this first type of separation is sometimes considered as quasi-twodimensional (Hucho 1998). From 15°up to 30°, the near wake is highly three-dimensional with partial separation on the slant surface along with strong conical streamwise vortices coming from the slant side edges and a ringshaped structure lying on the base surface.…”

Section: Introductionmentioning

confidence: 99%

Drag reduction on the 25° slant angle Ahmed reference body using pulsed jets

2011

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This paper highlights steady and unsteady measurements and flow control results obtained on an Ahmed model with slant angle of 25°in wind tunnel. On this high-drag configuration characterized by a large separation bubble along with energetic streamwise vortices, time-averaged and time-dependent results without control are first presented. The influence of rear-end periodic forcing on the drag coefficient is then investigated using electrically operated magnetic valves in an open-loop control scheme. Four distinct configurations of flow control have been tested: rectangular pulsed jets aligned with the spanwise direction or in winglets configuration on the roof end and rectangular jets or a large open slot at the top of the rear slant. For each configuration, the influence of the forcing parameters (non-dimensional frequency, injected momentum) on the drag coefficient has been studied, along with their impact on the static pressure on both the rear slant and vertical base of the model. Depending on the type and location of pulsed jets actuation, the maximum drag reduction is obtained for increasing injected momentum or well-defined optimal pulsation frequencies.

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“…Most of the experimental work performed in wind tunnels, have covered steady crosswind conditions and provided numerous design principle for crosswind aerodynamics, see e.g. Gilhaus and Renn [13], Howell [16,17] or Hucho [19]. One of the few transient crosswind experimental studies is reported in Cairns [2] and Chadwick et al [3].…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Detached-Eddy Simulations of Unsteady Crosswind Aerodynamics of Road Vehicles

Favre¹,

Efraimsson²

2011

Flow Turbulence Combust

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In this paper, the availability of Detached-Eddy Simulations (DES) for simulating unsteady crosswind aerodynamics in industrial applications is explored and reported. The flow around a simple car geometry under headwind, steady crosswind and time-dependent wind gust respectively, is analysed for two different types of mesh using a commercial software, STAR-CD. The typical Reynolds number of the flow cases studied is 2.0 · 10 6 based on the vehicle length. The performances of polyhedral meshes together with a comparable hexahedral mesh are evaluated for capturing the time development of the flow structures during a gust. From the results presented, it can be concluded that the aerodynamic coefficients can be reliably calculated using both polyhedral and hexahedral meshes, although the fine turbulent structures in the wake are better captured with the hexahedral mesh. Using turbulence methods like DES in order to resolve the flow scales provides a significant insight for designing a ground vehicle and, due to the reasonable computational times involved, can hence be foreseen to be incorporated in a design process in a near future.

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Aerodynamics of Road Vehicles

Cited by 331 publications

References 46 publications

Aerodynamic drag of a transiting sphere by large-scale tomographic-PIV

Aerodynamic drag of a transiting sphere by large-scale tomographic-PIV

Drag reduction on the 25° slant angle Ahmed reference body using pulsed jets

An Assessment of Detached-Eddy Simulations of Unsteady Crosswind Aerodynamics of Road Vehicles

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