dorsal/arxiv
View SchemaTransitions in the wake of a flapping foil
| Authors | Ramiro Godoy-Diana, Jean-Luc Aider, José Eduardo Wesfreid |
|---|---|
| Categories | |
| ArXiv ID | physics/0702219 |
| URL | https://arxiv.org/abs/physics/0702219 |
| DOI | 10.1103/PhysRevE.77.016308 |
| Journal | Phys. Rev. E 77, 016308 (2008) |
Abstract
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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"abstract": "We study experimentally the vortex streets produced by a flapping foil in a\nhydrodynamic tunnel, using 2D Particle Image Velocimetry (PIV). An analysis in\nterms of a flapping frequency-amplitude phase space allows to identify: 1) the\ntransition from the well-known B\\\u0027enard-von K\\\u0027arm\\\u0027an (BvK) wake to the\nreverse BvK vortex street that characterizes propulsive wakes, and 2) the\nsymmetry breaking of this reverse BvK pattern giving rise to an asymmetric\nwake. We also show that the transition from a BvK wake to a reverse BvK wake\nprecedes the actual drag-thrust transition and we discuss the significance of\nthe present results in the analysis of flapping systems in nature.",
"arxiv_id": "physics/0702219",
"authors": [
"Ramiro Godoy-Diana",
"Jean-Luc Aider",
"Jos\u00e9 Eduardo Wesfreid"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1103/PhysRevE.77.016308",
"journal_ref": "Phys. Rev. E 77, 016308 (2008)",
"title": "Transitions in the wake of a flapping foil",
"url": "https://arxiv.org/abs/physics/0702219"
},
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