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Influence of afterbody rounding on the pressure distribution over a fastback vehicle

Rossitto, Giacomo and Sicot, Christophe and Ferrand, Valérie and Borée, Jacques and Harambat, Fabien Influence of afterbody rounding on the pressure distribution over a fastback vehicle. (2016) Experiments in Fluids, 57 (3). 1-12. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-016-2120-1

Abstract

Experimental analyzes were performed to understand the drag evolution and the flow field modifications resulting from afterbody rounding on the Ahmed body, a simplified vehicle model with 25 degrees rear slant. Curvature effects were investigated using balance measurements, flow visualizations, wall pressure, and particle image velocimetry measurements. The rear end of the original well-known Ahmed body has sharp connections between the roof and the rear window as well as squared rear pillars. Similarly to previous studies, rounding the roof/backlight intersection was shown to reduce drag up to 16 %. Surprisingly, additional rear curvature associated with side pillar rounding did not further modify the drag. However, the zero net effect was found to result from opposite drag effects on the slanted and vertical surfaces and to hide strong local modifications on the flow field. The tridimensional organization and vorticity transport in the near wake were analyzed and connected to the observed local increase in the pressure drag on the base. Finally, these results were shown to be generic for a realistic rounded-end car shape.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://www.springerlink.com The original PDF of the article can be found at AExperiments in Fluids website: http://link.springer.com/journal/348
HAL Id:hal-01297591
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Other partners > Ecole Nationale Supérieure d’Ingénieurs de Poitiers - ENSIP (FRANCE)
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Deposited By: Valérie Ferrand
Deposited On:04 Apr 2016 12:40

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