Skip to Main content Skip to Navigation
Journal articles

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

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.
Keywords : Car aerodynamics
Complete list of metadatas

Cited literature [15 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01297591
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, April 4, 2016 - 3:05:23 PM
Last modification on : Tuesday, June 4, 2019 - 6:22:14 PM
Document(s) archivé(s) le : Tuesday, July 5, 2016 - 3:00:53 PM

File

Ferrand_15653.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Giacomo Rossitto, Christophe Sicot, Valérie Ferrand, Jacques Borée, Fabien Harambat. Influence of afterbody rounding on the pressure distribution over a fastback vehicle. Experiments in Fluids, Springer Verlag (Germany), 2016, 57 ( 3), pp.1-12. ⟨10.1007/s00348-016-2120-1⟩. ⟨hal-01297591⟩

Share

Metrics

Record views

203

Files downloads

276