BOT, Patrick B.; RABAUD, Marc; THOMAS, Goulven; LOMBARDI, Alessandro; LEBRET, Charles

doi:10.1103/PhysRevLett.117.234501

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BOT, Patrick B.
Institut de Recherche de l'Ecole Navale [IRENAV]

RABAUD, Marc
Fluides, automatique, systèmes thermiques [FAST]

THOMAS, Goulven
Institut de Recherche de l'Ecole Navale [IRENAV]

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Physical Review Letters. 2016, vol. 117, n° 23, p. 234501

American Physical Society

Résumé en anglais

Bluff bodies moving in a fluid experience a drag force which usually increases with velocity. However in a particular velocity range a drag crisis is observed, i.e., a sharp and strong decrease of the drag force. This counterintuitive result is well characterized for a sphere or a cylinder. Here we show that, for an object breaking the up-down symmetry, a lift crisis is observed simultaneously to the drag crisis. The term lift crisis refers to the fact that at constant incidence the time-averaged transverse force, which remains small or even negative at low velocity, transitions abruptly to large positive values above a critical flow velocity. This transition is characterized from direct force measurements as well as from change in the velocity field around the obstacle.< Réduire

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Lift Crisis

drag crisis

nonsymmetrical obstacles

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Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime

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