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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

Article dans une revue avec comité de lecture
Author
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
RABAUD, Marc
419361 Université Paris-Saclay
THOMAS, Goulven
LOMBARDI, Alessandro
LEBRET, Charles

URI
http://hdl.handle.net/10985/11396
DOI
10.1103/PhysRevLett.117.234501
Date
2016
Journal
Physical Review Letters

Abstract

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.

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