2003
DOI: 10.1007/s00348-002-0555-z
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Analysis of hysteresis and phase shifting phenomena in unsteady three-dimensional wakes

Abstract: 13 pagesInternational audienceThe aerodynamic characteristics of automobile vehicles are greatly influenced by the unsteady change in the direction of relative airflow. The aim of this paper is to analyse how such a change influences vehicle wake flow patterns. An analysis was conducted on a simplified model capable of reproducing the typical structures encountered under the aerodynamic conditions of an automobile vehicle. The results were then processed by mapping the steady and unsteady total pressure losses… Show more

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Cited by 9 publications
(9 citation statements)
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“…Several separations appear along the body from the front to the back [26]. The resulting recirculation zones contribute to a significant part of the drag coefficient [18,19,27]. This coefficient changes strongly with the angle a between the horizontal line and the rear window (for both the 2D and 3D flows, a minimum is achieved around a = 12°and a maximum around a = 30°).…”
Section: Introductionmentioning
confidence: 99%
“…Several separations appear along the body from the front to the back [26]. The resulting recirculation zones contribute to a significant part of the drag coefficient [18,19,27]. This coefficient changes strongly with the angle a between the horizontal line and the rear window (for both the 2D and 3D flows, a minimum is achieved around a = 12°and a maximum around a = 30°).…”
Section: Introductionmentioning
confidence: 99%
“…Ainsi les conditions aux limites, généralement associées aux essais en soufflerie ou en canal hydraulique, sont invariables et ne permettent pas d'analyser les influences desévolutions spatiales et temporelles des champs de vitesses ou de pressions qui apparaissent lors d'un coup de vent latéral ou lors des processus de dépassement ou de croisement de deux véhicules. Afin d'estimer ces influences sur la structure de l'écoulement, des expérimentations sont réalisées sur une géométrie simplifiée constituée d'un corps cylindrique muni d'un demi ovale de Rankineà l'avant et d'un culot inclinéà 43 •à l'arrière, Gilliéron et al [6]. Une description succincte du dispositif expérimental est donnée figure 5 (voir [6] pour plus de précisions).…”
Section: (I) Contributionà La Politique De Développement Durableunclassified
“…Afin d'estimer ces influences sur la structure de l'écoulement, des expérimentations sont réalisées sur une géométrie simplifiée constituée d'un corps cylindrique muni d'un demi ovale de Rankineà l'avant et d'un culot inclinéà 43 •à l'arrière, Gilliéron et al [6]. Une description succincte du dispositif expérimental est donnée figure 5 (voir [6] pour plus de précisions).…”
Section: (I) Contributionà La Politique De Développement Durableunclassified
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“…Some car companies as Renault have the objective to develop control solutions able to reduce at least 30% of the aerodynamic drag of the vehicles without constraints on the design, the comfort, the storage or the safety of the passengers [16]. Thus, it is necessary to modify locally the flow, to remove or delay the separation position or to reduce the development of the recirculation zone at the back and of the separated swirling structures [21]. This can be mainly obtained by controlling the flow near the wall with or without additional energy using active or passive devices [17,18].…”
Section: Introductionmentioning
confidence: 99%