scispace - formally typeset
Search or ask a question
Topic

Aquatic locomotion

About: Aquatic locomotion is a research topic. Over the lifetime, 69 publications have been published within this topic receiving 3796 citations. The topic is also known as: swim & active swimming.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors investigated the role of design in the relation between propulsive efficiency and thrust production under a sculling kinematic motion profile of a reduced-size appendage-based swimmer.

3 citations

Journal ArticleDOI
TL;DR: Understanding the transition from neonate to juvenile locomotory forms in the epaulette shark Hemiscillum ocellatum could provide insight on the water to land transition of tetrapods.
Abstract: {Extract} The transition from swimming to walking was an important event in the evolution of tetrapods. To understand this transition, researchers have studied movement in many extinct and extant aquatic and semi-aquatic species. The epaulette shark Hemiscillum ocellatum uses slow-to-medium walking, fast walking, and swimming forms of aquatic locomotion. We described kinematic differences between the three gaits in neonate (n=6) and juvenile (n=6) sharks hatched and reared in the laboratory. Neonates retain nutrition from an internal yolk until they develop a consistent feeding schedule (~35d post-hatch). They are then classified as juveniles, foraging for worms, crustaceans, and small fish. We hypothesized that changes in diet and feeding habits would affect gait performance between neonates and juveniles. Using video tracking software and 13 anatomical landmarks along the fins, girdles, and body mid-line, whole body velocity, duty factor, fin frequency, girdle rotation, and body curvature were calculated to identify characteristic movements of the gaits for each shark. Velocity was greater in neonates when compared to juveniles across all gaits; however, both groups increased velocity from walking to swimming. Regardless of gait, pelvic girdles had a greater range of motion than pectoral girdles for both neonates and juveniles. In juveniles, regardless of gait, the contralateral sides of the pectoral and pelvic girdles were synchronized during lateral excursions. Neonates, however, exhibited overlapping of ipsilateral sides of the girdles. Understanding the transition from neonate to juvenile locomotory forms in this species could provide insight on the water to land transition of tetrapods.

2 citations

Journal ArticleDOI
TL;DR: In this article, an open source implementation of the immersed boundary method was used (IB2d) to solve the fully coupled fluid-structure interaction problem of a flexible jellyfish bell in a viscous fluid.
Abstract: Jellyfish have been called one of the most energy-efficient animals in the world due to the ease in which they move through their fluid environment, by product of their bell kinematics coupled with their morphological, muscular, material properties. We investigated jellyfish locomotion by conducting in silico comparative studies and explored swimming performance across different fluid scales (i.e., Reynolds Number), bell contraction frequencies, and contraction phase kinematics (duty cycle) for a jellyfish with a fineness ratio of 1 (ratio of bell height to bell diameter). To study these relationships, an open source implementation of the immersed boundary method was used (IB2d) to solve the fully coupled fluid-structure interaction problem of a flexible jellyfish bell in a viscous fluid. Thorough 2D parameter subspace explorations illustrated optimal parameter combinations in which give rise to enhanced swimming performance. All performance metrics indicated a higher sensitivity to bell actuation frequency than fluid scale or duty cycle, via Sobol sensitivity analysis, on a higher performance parameter subspace. Moreover, Pareto-like fronts were identified in the overall performance space involving the cost of transport and forward swimming speed. Patterns emerged within these performance spaces when highlighting different parameter regions, which complemented the global sensitivity results. Lastly, an open source computational model for jellyfish locomotion is offered to the science community that can be used as a starting place for future numerical experimentation.

2 citations

Patent
09 Apr 1987

1 citations

Posted Content
TL;DR: In this article, it was shown that a fish with bounded aquatic locomotion speed can reach any point in the ocean if the fluid velocity is incompressible, bounded, and has small mean drift.
Abstract: As avid anglers we were always interested in the survival chances of fish in turbulent oceans. This paper addresses this question mathematically. We show that a fish with bounded aquatic locomotion speed can reach any point in the ocean if the fluid velocity is incompressible, bounded, and has small mean drift.

Network Information
Related Topics (5)
Wing
12.5K papers, 168.6K citations
76% related
Adaptation
3.3K papers, 168.6K citations
71% related
Sexual selection
9.9K papers, 588.7K citations
69% related
Allometry
2.2K papers, 115.8K citations
68% related
Ground reaction force
4K papers, 105.7K citations
68% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20217
20201
20194
20183
20173
20166