Locomotion of a self-propulsive pitching plate in a quiescent viscous fluid

Wang, Li

doi:10.1177/0954406220903338

Cited by 8 publications

(9 citation statements)

References 33 publications

(57 reference statements)

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“…The effects of uniform flexibility on swimming speed, thrust generation, swimming energetics and stability have been analysed in numerous other experimental and computational studies (see e.g. Shoele & Mittal 2016; Feilich & Lauder 2015; Michelin & Llewellyn Smith 2009; Combes & Daniel 2001; Hua, Zhu & Lu 2013; Wang 2020; Ryu et al. 2019).…”

Section: Introductionmentioning

confidence: 99%

Active tail flexion in concert with passive hydrodynamic forces improves swimming speed and efficiency

et al. 2021

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Fish typically swim by periodic bending of their bodies. Bending seems to follow a universal rule; it occurs at about one-third from the posterior end of the fish body with a maximum bending angle of about $30^{\circ }$ . However, the hydrodynamic mechanisms that shaped this convergent design and its potential benefit to fish in terms of swimming speed and efficiency are not well understood. It is also unclear to what extent this bending is active or follows passively from the interaction of a flexible posterior with the fluid environment. Here, we use a self-propelled two-link model, with fluid–structure interactions described in the context of the vortex sheet method, to analyse the effects of both active and passive body bending on the swimming performance. We find that passive bending is more efficient but could reduce swimming speed compared with rigid flapping, but the addition of active bending could enhance both speed and efficiency. Importantly, we find that the phase difference between the posterior and anterior sections of the body is an important kinematic factor that influences performance, and that active antiphase flexion, consistent with the passive flexion phase, can simultaneously enhance speed and efficiency in a region of the design space that overlaps with biological observations. Our results are consistent with the hypothesis that fish that actively bend their bodies in a fashion that exploits passive hydrodynamics can at once improve speed and efficiency.

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Section: Introductionmentioning

confidence: 99%

Active tail flexion in concert with passive hydrodynamic forces improves swimming speed and efficiency

et al. 2021

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“…This was also demonstrated in a number of studies that the flapping motion can help creatures fly or swim better. [1][2][3][4] Recently, there has been considerable interest in developing novel energy-saving vehicles that use flapping foils propulsion systems inspired by biology, which has great application potential especially in the field of micro air vehicles (MAVs) and unmanned underwater vehicles (UUVs). The bio-inspired vehicles with flapping foils have been developed at a fast speed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Transient effects during transitions of bio-inspired flapping foils between two different schooling configurations

Han

Chen

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Recently, there has been considerable interest in developing novel energy-saving vehicles that use flapping foils propulsion systems inspired by biology. Facing increasingly complex application tasks, the coordination of multiple vehicles will be a hot issue in the future this research field. We are inspired by changes in configurations of biological collective behavior (known as schooling) in nature, focused on studying transient effects during transitions of three-dimensional bio-inspired flapping foils between two different bionic schooling configurations. Numerical simulations employing the immersed boundary-lattice Boltzmann method (IB-LBM) for unsteady hydrodynamics of flapping foils in schooling transitions were performed. Effects of different mutual transition modes between tandem and diamond schooling configurations on their thrust performance were investigated. Meanwhile, we present hydrodynamics of flapping foils in a schooling with different downstream flapping frequencies under the best transition mode. The results show that during transitions between two schooling configurations, there is an optimal energy-saving transition mode. It has nothing to do with the length of transition distance. Different downstream flapping frequencies will affect the interacting vortices between fluid and structure and then affect transient effects during schooling transition. Although the transition modes were specified, our research takes the transients effects of schooling transitions as an influencing factor to be considered for formations changes, which will provide a new idea for the design bio-inspired vehicle cluster formation.

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“…Flapping strategy used by birds and insects has drawn considerable attentions, due to its extraordinary aerodynamic performance [14,24,4,11,20]. Many previous studies were focusing on the aerodynamics of flapping wing [25,18,12,13].…”

Section: Introductionmentioning

confidence: 99%

Sound generation by three-dimensional flapping wings during hovering flight

Wang¹,

Tian²

2020

Australasian Fluid Mechanics Conference (AFMC)

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Flapping flight strategy is widely adopted by insects and birds, which has drawn considerable attentions due to its excellent aerodynamic performance. It is worth noting that the good performance and great agility is also achieved with low noise. To apply this flight strategy to engineering, it is necessary to conduct corresponding studies to understand both the aerodynamics and the associated acoustics of the flapping wing. In this paper, the sound generated by flexible flapping wings during hovering flight is numerically studied by using an immersed boundary method. A series of parameters including the wing shape, wing-to-fluid mass ratio and wing flexibility are systematically examined at a low Reynolds number. It is found that appropriate flexibilities of the wing enhance the aerodynamic performance and reduce the noise generation.

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Locomotion of a self-propulsive pitching plate in a quiescent viscous fluid

Cited by 8 publications

References 33 publications

Active tail flexion in concert with passive hydrodynamic forces improves swimming speed and efficiency

Active tail flexion in concert with passive hydrodynamic forces improves swimming speed and efficiency

Transient effects during transitions of bio-inspired flapping foils between two different schooling configurations

Sound generation by three-dimensional flapping wings during hovering flight

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