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Published in:
2016 | OriginalPaper | Chapter
Vortical Structures Generated Behind Flapping Foils with Different Aspect Ratios
Authors : B. Franco Llamas, E. Sandoval Hernández, A. Cros
Published in: Recent Advances in Fluid Dynamics with Environmental Applications
Publisher: Springer International Publishing
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Abstract
Different vortical patterns are observed behind flapping foils in a uniform water flow. Previous studies have described these structures and delimited the parameter intervals for which each pattern develops. Generally, the two pertinent nondimensional numbers are the Strouhal number StD, proportional to the foil oscillation frequency, and AD, related to the foil oscillation amplitude. In this experimental study, we show that the value of the foil aspect ratio radically changes the transition diagram. More particularly, for the StD and AD values for which the reversed von Kármán street develops when the foil is “long”, another pattern is generated when the foil is shorter.