Transitions in the wake of a flapping foil

Details Transitions in the wake of a flapping foil Transitions in the wake of a flapping foil

2007-02-26

arxiv.org/abs/physics/0702219v2

Phys. Rev. E 77, 016308 (2008)

Physics

Fluid Dynamics

Revised version includes minor changes in the discussion of the drag coefficient calculation. The 4 figures are unchanged

Scientific paper

10.1103/PhysRevE.77.016308

We study experimentally the vortex streets produced by a flapping foil in a hydrodynamic tunnel, using 2D Particle Image Velocimetry (PIV). An analysis in terms of a flapping frequency-amplitude phase space allows to identify: 1) the transition from the well-known B\'enard-von K\'arm\'an (BvK) wake to the reverse BvK vortex street that characterizes propulsive wakes, and 2) the symmetry breaking of this reverse BvK pattern giving rise to an asymmetric wake. We also show that the transition from a BvK wake to a reverse BvK wake precedes the actual drag-thrust transition and we discuss the significance of the present results in the analysis of flapping systems in nature.

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