Experiments and Simulations of Maximal Sculling Propulsion: Vorticity Impulse in Human Biomechanics

Furmánek, Petr; Apraiz, José Manuel Redondo; Carrillo, Àgueda García; Alvarez, Jackson David Tellez; Arellano, Raúl; Sánchez, Jesús

doi:10.14311/tpfm.2016.007

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…During the butterfly stroke, the human body undergoes undulating motion with the head, leading the movement of the stroke. The wing-like arms provide most of the propulsion for the stroke by simultaneously stretching out, pulling, and sweeping both arms for propulsion (33,34). Similarly, our soft swimmer bends its soft body to generate a wave-like undulation with its head moving up and down during the stroke, as shown in the tracked undulating trajectory of its soft body mass center in Fig.…”

Section: Butterfly Stroke-like High-speed Soft Flapping Swimmermentioning

confidence: 99%

Snapping for high-speed and high-efficient butterfly stroke–like soft swimmer

et al. 2022

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Natural selection has tuned many flying and swimming animals to share the same narrow design space for high power efficiency, e.g., their dimensionless Strouhal numbers St that relate flapping frequency and amplitude and forward speed fall within the range of 0.2 < St < 0.4 for peak propulsive efficiency. It is rather challenging to achieve both comparably fast-speed and high-efficient soft swimmers to marine animals due to the naturally selected narrow design space and soft body compliance. Here, bioinspired by the flapping motion in swimming animals, we report leveraging snapping instabilities for soft flapping-wing swimmers with comparable high performance to biological counterparts. The lightweight, butterfly stroke–like soft swimmer (2.8 g) demonstrates a record-high speed of 3.74 body length/s (4.8 times faster than the reported fastest flapping soft swimmer), high power efficiency (0.2 < St = 0.25 < 0.4), low energy consumption cost, and high maneuverability (a high turning speed of 157°/s).

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Section: Butterfly Stroke-like High-speed Soft Flapping Swimmermentioning

confidence: 99%

Snapping for high-speed and high-efficient butterfly stroke–like soft swimmer

et al. 2022

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“…Understanding their mutual effects is of great value in different fields, including performance enhancement in competitive swimming [4,5], effect improvement in rehabilitation training [6], and design optimization of underwater exoskeletons [7]. Research on human swimming dynamics started from the end of the last century, and currently, the mainstream methods are computational fluid dynamics (CFD) [8][9][10][11][12][13][14][15][16][17], experiments [18][19][20][21][22][23][24][25], and multi-rigid body dynamics [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…For example, a mechanical system consisting of pulleys, chains, and force sensors was developed to measure the fluid force applied on the human hand under unsteady currents conditions [21]. There are also many studies using the particle image velocimetry (PIV), an optical-based technology, to measure the actual flow fields around swimmers [23][24][25]. Compared with conventional experiment methods, PIV has obvious merits: it does not require additional sensors to be attached to the subjects so that the swimming motion will not be disrupted; it can easily measure the instantaneous velocity, vorticity, and heat-flux rates of the whole flow field, which are difficult to be achieved via traditional means.…”

Section: Introductionmentioning

confidence: 99%

Effects of Currents on Human Freestyle and Breaststroke Swimming Analyzed by a Rigid-Body Dynamic Model

Bao

Fang

2021

Machines

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Swimming is a kind of complex locomotion that involves the interaction between the human body and the water. Here, to examine the effects of currents on the performance of freestyle and breaststroke swimming, a multi-body Newton-Euler dynamic model of human swimming is developed. The model consists of 18 rigid segments, whose shapes and geometries are determined based on the measured data from 3D scanning, and the fluid drags in consideration of the current are modeled. By establishing the interrelations between the fluid moments and the swimming kinematics, the underlying mechanism that triggers the turning of the human body is uncovered. Through systematic parametric analyses, the effects of currents on swimming performance (including the human body orientation, swimming direction, swimming speed, and propulsive efficiency) are elucidated. It reveals that the current would turn the human body counterclockwise in freestyle swimming, while clockwise in breaststroke swimming (which means that from the top view, the human trunk, i.e., the vector pointing from the bottom of feet to the top of the head, rotates counterclockwise or clockwise). Moreover, for both strokes, there exists a critical current condition, beyond which, the absolute swimming direction will be reversed. This work provides a wealth of fundamental insights into the swimming dynamics in the presence of currents, and the proposed modeling and analysis framework is promising to be used for analyzing the human swimming behavior in open water.

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Experiments and Simulations of Maximal Sculling Propulsion: Vorticity Impulse in Human Biomechanics

Cited by 2 publications

References 9 publications

Snapping for high-speed and high-efficient butterfly stroke–like soft swimmer

Snapping for high-speed and high-efficient butterfly stroke–like soft swimmer

Effects of Currents on Human Freestyle and Breaststroke Swimming Analyzed by a Rigid-Body Dynamic Model

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