Flow-Mediated Interactions between Two Self-Propelled Flapping Filaments in Tandem Configuration

Zhu, Xiaojue; He, Guowei; Zhang, Xing

doi:10.1103/physrevlett.113.238105

Cited by 104 publications

(133 citation statements)

References 25 publications

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“…The mechanism research plays an important role and will boost the development of the principle prototype. To reveal the mechanism of high-efficiency propulsion, scholars at home and abroad have devoted considerable effort with different research methods [5][6][7]. However, both the prototype-based experimental results and the numerical results achieved are far from the expected performance.…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

2017

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Bionic foils are usually similar in shape to the locomotive organs of animals living in fluid media, which is helpful in the analysis of the motion mode and hydrodynamic mechanisms of biological prototypes. With the design of underwater vehicles as the research background, bionic foils are adopted as research objects in this paper. A geometric model and a motion model are established depending on the biological prototype. In the model, two typical bionic foils-a NACA foil and a crescent-shaped foil-are chosen as research objects. Simulations of the bionic foils are performed using a numerical method based on computational fluid dynamics software. The hydrodynamic forces acting on the foils and flow field characteristics behind the foils are used to analyze the propulsion performance and hydrodynamic mechanism. Furthermore, a spanwise flexibility model is introduced into the motion model. Next, the hydrodynamic mechanism is further analyzed on the basis of hydrodynamic forces and flow field characteristics with different spanwise flexibility parameters. Finally, an experimental verification platform is designed and built to verify the reliability of the numerical results. Agreement between the experimental and numerical results indicates that the numerical results are reliable and that the analysis of the paper is reasonable.

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Section: Introductionmentioning

confidence: 99%

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

2017

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“…8 denote for the initial gap distances of G x,i = 2 and 3, respectively. The gap distance was maintained as the initial value during the first few flapping periods, and then increased (red) or decreased (blue) depending on how the downstream fin interacted with the oncoming vortices shed from the leading fin (Zhu et al 2014). After a few flapping periods, they formed a stable configuration spontaneously, and the gap distance was maintained.…”

Section: Fish Swimming In Schoolmentioning

confidence: 99%

“…The trajectory of the leading edge denoted by the black line was locked onto the oncoming vortex centers in the tandem stable configuration, which was referred to as the vortex interception mode (Zhu et al 2014;Uddin et al 2015;. Figure 7(b) shows the schematic of vortex interception mode for fish swimming in a reverse Karman gait, where the leading edge trajectory and the induced flow direction are in-phase in the spanwise direction.…”

Section: Fish Swimming In Schoolmentioning

confidence: 99%

“…The dynamic nature of fish schools was not considered in these systems since the relative positions among the schooling members did not change. Zhu et al (2014) modelled two self- Park and Sung, Mechanical Engineering Reviews, Vol.5, No.1 (2018) [DOI: 10.1299/mer. propelled flexible fins in a tandem configuration, where their relative positions were dynamically determined.…”

Section: Fish Swimming In Schoolmentioning

confidence: 99%

“…Fish schools have enticed many researchers from biologists to hydrodynamicists, and the hydrodynamic mechanisms at which fish can benefit from swimming in a group have been studied theoretically (Breder 1965;Weihs 1973), experimentally (Abrahams and Colgan 1985;Pitcher 1986;Abrahams and Colgan 1987;Killen et al 2012;Marras et al 2015), and numerically (Zhu & Peskin 2003;Deng & Shao 2006;Deng et al 2007;Dong & Lu 2007;Huang et al 2007;Alben 2009;Zhu 2009;Kim et al 2010;Gazzola et al 2011;Uddin et al 2013;Zhu et al 2014;Daghooghi & Borazjani 2015;Hemelrijk et al 2015;Uddin et al 2015;Tian et al 2016;Lin et al 2017;Maertens et al 2017). According to the early inviscid theoretical model proposed by Weihs (1973), fish positioned laterally midway between two upstream fish can benefit from enhanced flows induced by oncoming vortices, which is referred to as the vortex hypothesis.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of a self-propelled flexible fin in perturbed flows

Saleel

Sung

2018

Mechanical Engineering Reviews

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A self-propelled flexible fin is subjected to perturbed flows produced by inanimate structures or other moving organisms. An optimal flapping motion in unbounded fluids may not be optimal in perturbed flows. The goal of this paper is to review key studies that focused on the hydrodynamics of fish swimming in perturbed flows, and to reveal the mechanisms by which fish can exploit energy from the surrounding fluid by modelling a selfpropelled flexible fin. A heaving motion was prescribed on the leading edge of the fin, and other posterior parts passively adapted to the surrounding fluid as a result of the fluid-flexible-body interaction. We consider three flow environments in this paper; i) near the ground, ii) behind a cylinder, and iii) in the wake of another moving fin. The self-propelled fin modeled here can generate more thrust with a smaller penalty of increased power input, leading to increased propulsive efficiency by flapping near the ground. For the same heaving motion, the self-propelled fin near the ground can swim faster than that moving far from the ground. The fins swimming in the wake of a circular cylinder can maintain the relative positions to the upstream cylinder without using any power input by adjusting their heaving frequency as the vortex shedding frequency, and by slaloming between the oncoming vortices. Two tandem self-propelled fins with an identical heaving motion form a stable configuration spontaneously, and the power input is reduced for the following fin by passing through the oncoming vortex centers. A Karman vortex street is generated in the wake of the cylinder, while a reverse Karman vortex street is formed behind a self-propelled fin. The optimal trajectories for the fins swimming in a Karman and reverse Karman vortex streets are observed in the vortex slaloming and interception modes, respectively, where the heaving motion is in-phase with the induced flow direction in the spanwise direction. The synchronization enables the fins to save the energy required in the swimming behaviors.

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Vortex interactions of two burst-and-coast swimmers in a side-by-side arrangement

Chao

Bhalla

2023

Theor. Comput. Fluid Dyn.

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Flow-Mediated Interactions between Two Self-Propelled Flapping Filaments in Tandem Configuration

Cited by 104 publications

References 25 publications

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

Hydrodynamics of a self-propelled flexible fin in perturbed flows

Vortex interactions of two burst-and-coast swimmers in a side-by-side arrangement

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