Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M16: Vortex Wakes and Propulsion
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center Room: B303
Chair: Bartosz Protas, McMaster University
Abstract ID: BAPS.2018.DFD.M16.5
Abstract: M16.00005 : Vortex wakes of a flapping foil in a viscous uniform flow*
8:52 AM–9:05 AM
Min Je Kim
Min Je Kim
Jae Hwa Lee
We perform numerical simulations for two types of rigid and flexible thin foils in a viscous uniform flow to explore the effects of the flexibility on wakes. The thin foils are prescribed by the heaving motions and the relevant non-dimensional parameters are the chord length based Strouhal number and heaving amplitude. When the dynamical features of the wakes are varied with respect to the two parameters, it is possible to make a direct comparison between a both foils. We find three transition boundaries in the wake maps of the thin foils: the transition from a von Kármán to a reverse von Kármán wake, transition from reverse von Kármán to asymmetric reverse von Kármán wake, and a further transition from asymmetric reverse von Kármán to complex wake. The wake transition boundaries of the rigid thin foil are predicted by constant amplitude based Strouhal number(StA) lines, consistent with previous studies. However, contrary to the observation from the rigid thin foil, the wake transition boundaries of the flexible thin foil are not predictable by constant StA lines.
*This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1A09000537) and the Ministry of Science, ICT & Future Planning (NRF-2017R1A5A1015311).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M16.5
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