Vortex wakes of a flapping foil in a flowing soap film

Teis Schnipper (Author), Anders Peter Andersen (Author), Tomas Bohr (Author)

Research output: Non-textual formSound/Visual production (digital)Research


We present an experimental study of an oscillating, symmetric foil in a vertically flowing soap film. By varying frequency and amplitude of the oscillation we explore and visualize a variety of wake structures, including von K´arm´an wake, reverse von K´arm´an wake, 2P wake, and 2P+2S wake. We characterize the transition from the von K´arm´an wake (drag) to the reverse von K´arm´an wake (thrust) and discuss the results in relation to fish swimming. We visualize the time evolution of the vortex shedding in detail, identify the origins of the vortices comprising the wake, and propose a simple model to account for the transition from von K´arm´an like wakes to more exotic wake structures.
Original languageEnglish
Publication date2008
Publication statusPublished - 2008
EventAPS Division of Fluid Dynamics - San Antonio, USA
Duration: 1 Jan 2008 → …


ConferenceAPS Division of Fluid Dynamics
CitySan Antonio, USA
Period01/01/2008 → …


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