Springer Verlag, Journal of Visualization, 4(17), p. 295-297
DOI: 10.1007/s12650-014-0208-3
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We present dye visualizations of the wake behind a flexible plate flow when its leading edge is forced into harmonic heave motion. We show that, when the forcing amplitude is sufficiently large, a reverse Bénard-von Kármán vortex street is formed in the wake, indicative of the production of positive thrust.