Underlying principle of efficient propulsion in flexible plunging foils

Zhu, Xiaojue; He, Guowei; Zhang, Xing

doi:10.1007/s10409-014-0114-x

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…This argument has been validated in rigid flapping foils by Triantafyllou [45]. Recently, the validity of this principle was also demonstrated in flapping foils with active and passive flexibility [46][47][48]. It should be noted that validation analysis of the hydrodynamic wake resonance principles was conducted only in flappers fixed in a freestream.…”

Section: Structural Resonance Wake Resonance and Performance Optimizationmentioning

confidence: 90%

Self-propulsion of flapping bodies in viscous fluids: Recent advances and perspectives

Wang

Zhang

2016

Acta Mech. Sin.

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Flapping-powered propulsion is used by many animals to locomote through air or water. Here we review recent experimental and numerical studies on self-propelled mechanical systems powered by a flapping motion. These studies improve our understanding of the mutual interaction between actively flapping bodies and surrounding fluids. The results obtained in these works provide not only new insights into biolocomotion but also useful information for the biomimetic design of artificial flyers and swimmers.

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Section: Structural Resonance Wake Resonance and Performance Optimizationmentioning

confidence: 90%

Self-propulsion of flapping bodies in viscous fluids: Recent advances and perspectives

Wang

Zhang

2016

Acta Mech. Sin.

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“…The Strouhal number (dimensionless frequency) determined by using this principle was found to lie in the range for natural flyers and swimmers. The wake resonance theory was then re-examined in flexible propulsors [68][69][70] and the correlation between wake stability properties and swimming performance was also confirmed. However, Arbie et al [71] recently argued that this theory was only valid in the wakes of thrust-producing types.…”

Section: Flexible Flapping Foils Inspired By Fish and Insectsmentioning

confidence: 97%

Fluid-structure interaction of bio-inspired flexible slender structures: a review of selected topics

Wang¹,

Tang²,

Zhang³

2022

Bioinspir. Biomim.

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Flexible slender structures are ubiquitous in biological systems and engineering applications. Fluid-structure interaction (FSI) plays a key role in the dynamics of such structures immersed in fluids. Here we survey recent studies on highly simplified bio-inspired models (either mathematical or mechanical) that aim at revealing the flow physics associated with FSI. Various models from different sources of biological inspiration are included, namely, flexible flapping-foil inspired by fish and insects, deformable membrane inspired by jellyfish and cephalopods, beating filaments inspired by flagella and cilia of microorganisms, and flexible wall-mounted filaments inspired by terrestrial and aquatic plants. Suggestions on the directions for future research are also provided.

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“…Additional influencing factors include the spring stiffness, added mass, and critical pitching amplitude of the pitching motion [20,32,34]. Conventional semi-active flapping foil has a rigid body, and some scholars also carried out research work on the hydrodynamic performance of flexible flapping hydrofoil [35,36]. Limiting the magnitude of the pitching motion may reduce the propulsion efficiency of flapping foil [26,33].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Semi-Active Flapping Foil of the Wave Glider

Zou

et al. 2019

JMSE

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A numerical investigation is conducted to study the propulsive performance of the semi-active flapping foil of the wave glider, where the heaving smotion is fully prescribed, and the pitching motion is determined by the hydrodynamic force and torsion spring. A mesh for two-dimensional NACA0012 foil with the Reynolds number Re = 42000 is produced, and a dynamic mesh and sliding interface are used in the computation. The influences of reduced frequency, spring stiffness, and critical pitching amplitude on the hydrodynamic characteristics of semi-active flapping foil are systematically investigated. We find that there is a critical reduced frequency: When the reduced frequency is lower than the critical value, the propulsive performance of flapping foil can be improved exponentially, and when the reduced frequency is higher than the critical value, the semi-active flapping foil cannot provide an effective thrust. For a greater reduced frequency, there is an optimal spring stiffness value, which corresponds to the maximum value of the output power coefficient. For a lower reduced frequency, the mean value of the output power coefficient monotonically decreases as the spring stiffness increases. We also notice that the propulsive efficiency of flapping foil monotonically decreases as the spring stiffness increases. Finally, we find that the appropriate critical pitching amplitude can improve the propulsive performance of semi-active flapping foil, especially for greater heaving amplitudes.

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Underlying principle of efficient propulsion in flexible plunging foils

Cited by 5 publications

References 15 publications

Self-propulsion of flapping bodies in viscous fluids: Recent advances and perspectives

Self-propulsion of flapping bodies in viscous fluids: Recent advances and perspectives

Fluid-structure interaction of bio-inspired flexible slender structures: a review of selected topics

Numerical Investigation of the Semi-Active Flapping Foil of the Wave Glider

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