Abstract：
:Numerical simulations are used to investigate the wake structure and hydrodynamic performance of bionic flapping foils. The study is motivated by the quest to understand the fluid dynamics of fish fins and use it in the underwater propulsion. The simulations employ an immersed boundary method that makes it possible to simulate flows with complex moving boundaries on fixed Cartesian grids. A detailed analysis of the vortex topology shows that the wake of flapping foils is dominated by two sets of complex shaped vortex rings that convect at oblique angles to the wake centerline. The wake of these flapping foils is characterized by two oblique jets. Simulations are also used to examine the wake vortex and hydrodynamic performance over a range of Strouhal numbers and maximum pitch angles and the connection between the foil kinematics, vortex dynamics and force production is discussed. The results show that the variety law of the hydrodynamic performance with kinematic parameters strongly depends on the flow dynamics underlying the force production, including the orientation, interconnection and dissipation rate of the vortex rings.
journal_name
Saudi J Biol Scijournal_title
Saudi journal of biological sciencesauthors
Liu W,Li N,Zhao J,Su Ydoi
10.1016/j.sjbs.2016.09.015subject
Has Abstractpub_date
2017-09-01 00:00:00pages
1344-1354issue
6eissn
1319-562Xissn
2213-7106pii
S1319-562X(16)30113-9journal_volume
24pub_type
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