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Experiments in Fluids

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01.11.2010 | Research Article

Drag reduction of a 3D bluff body using coherent streamwise streaks

verfasst von: G. Pujals, S. Depardon, C. Cossu

Erschienen in: Experiments in Fluids | Ausgabe 5/2010

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Abstract

Separation on the rear-end of an Ahmed body is suppressed by means of large-scale coherent streaks forced on the roof of the model. These streaks originate from an array of suitably shaped cylindrical roughness elements and are amplified by the mean shear through the lift-up effect. Interacting with the mean velocity field at leading order, they induce a strong controlled spanwise modulation. The resulting streaky base flow is observed to sustain the adverse pressure gradient since PIV measurements as well as static wall pressure distributions show that the re-circulation bubble completely vanishes. These modifications of the topology of the flow are associated with a substantial drag reduction, which can be of about 10% when the roughness array is optimally placed on the roof of the bluff body.

Vorheriger Artikel A rotating elliptic airfoil in fluid at rest and in a parallel freestream

Nächster Artikel Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow

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Titel: Drag reduction of a 3D bluff body using coherent streamwise streaks
verfasst von: G. Pujals
S. Depardon
C. Cossu
Publikationsdatum: 01.11.2010
Verlag: Springer-Verlag
Erschienen in: Experiments in Fluids / Ausgabe 5/2010
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-010-0857-5

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