Work

Transitions in the wake of a flapping foil

Year: 2008

Type: article

Abstract: We study experimentally the vortex streets produced by a flapping foil in a hydrodynamic tunnel, using two-dimensional particle image velocimetry. An analysis in terms of a flapping frequency-amplitude phase space allows the identification of (i) the transition from the well-known Bénard-von Kármán (BvK) wake to the reverse BvK vortex street that characterizes propulsive wakes, and (ii) 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.

Source: Physical Review E

DOI: 10.1103/physreve.77.016308

Authors: Ramiro Godoy-Diana, Jean-Luc Aider, José Eduardo Wesfreid

Institutions: Centre National de la Recherche Scientifique, Physique et Mécanique des Milieux Hétérogènes, ESPCI Paris

Language: English

Topic: Biomimetic flight and propulsion mechanisms

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W1965310637

FWCI: 14.95

Cites: 34

Cited by: 303

Related to: 10