Hydrodynamics of swimming in stingrays: numerical simulations and the role of the leading-edge vortex

  title={Hydrodynamics of swimming in stingrays: numerical simulations and the role of the leading-edge vortex},
  author={R. G. Bottom II and Iman Borazjani and Erin L. Blevins and George V. Lauder},
  journal={Journal of Fluid Mechanics},
  pages={407 - 443}
Stingrays, in contrast with many other aquatic animals, have flattened disk-shaped bodies with expanded pectoral ‘wings’, which are used for locomotion in water. To discover the key features of stingray locomotion, large-eddy simulations of a self-propelled stingray, modelled closely after the freshwater stingray, Potamotrygon orbignyi, are performed. The stingray’s body motion was prescribed based on three-dimensional experimental measurement of wing and body kinematics in live stingrays at… 

Hydrodynamic Performance of Aquatic Flapping: Efficiency of Underwater Flight in the Manta

The manta is the largest marine organism to swim by dorsoventral oscillation (flapping) of the pectoral fins. The manta has been considered to swim with a high efficiency stroke, but this assertion

Vortex dynamics and hydrodynamic performance enhancement mechanism in batoid fish oscillatory swimming

Abstract The effects of chordwise deformation and the half-amplitude asymmetry on the hydrodynamic performance and vortex dynamics of batoid fish have been numerically investigated, in which the two

Bio-Inspired Propulsion: Towards Understanding the Role of Pectoral Fin Kinematics in Manta-like Swimming

Through computational fluid dynamics (CFD) simulations of a model manta ray body, the hydrodynamic role of manta-like bioinspired flapping is investigated. The manta ray model motion is reconstructed

Computational analysis of vortex dynamics and performance enhancement due to body–fin and fin–fin interactions in fish-like locomotion

Numerical simulations are used to investigate the hydrodynamic benefits of body–fin and fin–fin interactions in a fish model in carangiform swimming. The geometry and kinematics of the model are

Swimming performance and unique wake topology of the sea hare ( Aplysia )

The Aplysia, commonly referred to as the ’sea hare’, is a marine mollusc that swims using largeamplitude flapping of its wide, wing-like parapodia. In this study, flow simulations with a relatively

The effect of batoid inspired undulating motions on the propulsive forces of a circular planform

This study explores the nature of forces developed by a batoid-inspired undulating circular planform. The forces that arise from this type of fin-based propulsion have two components, one due to

Self-propelled swimming simulations of bio-inspired smart structures

Self-propelled swimming simulations of a foldable structure, whose folded configuration is a box, show that structures that employ carangiform undulations can swim faster, whereas anguilliform swimmers are more economic, i.e., using less power they can swim a longer distance.



Numerical investigation of the hydrodynamics of anguilliform swimming in the transitional and inertial flow regimes

The propulsive efficiency of anguilliform swimmers at St* is not an increasing function of Re but instead is maximized in the transitional regime and the form drag decreases while viscous drag increases as St increases.

Numerical investigation of the hydrodynamics of carangiform swimming in the transitional and inertial flow regimes

Numerical simulation helps elucidate the results of previous experiments with live fish, underscore the importance of scale (Re) effects on the hydrodynamic performance of carangiform swimming, and help explain why in nature this mode of swimming is typically preferred by fast swimmers.

Simulations of optimized anguilliform swimming

The results of the present simulations support the hypothesis that anguilliform swimmers modify their kinematics according to different objectives and provide a quantitative analysis of the swimming motion and the forces experienced by the body.

The fish tail motion forms an attached leading edge vortex

The first evidence of the vortex reattachment at the leading edge of the fish tail is provided using three-dimensional high-resolution numerical simulations of self-propelled virtual swimmers with different tail shapes and the evolution of the LEV drastically alters the pressure distribution on the tail and the force it generates.

Near-body flow dynamics in swimming fish

The fish benefits from smooth near-body flow patterns and the generation of controlled body-bound vorticity, which is propagated towards the tail, shed prior to the peduncle region and then manipulated by the caudal fin to form large-scale vortical structures with minimum wasted energy.

The hydrodynamics of eel swimming

The hydrodynamics of American eels swimming steadily at 1.4 L s-1 are examined and it is inferred that the lack of downstream flow results from a spatial and temporal balance of momentum removal and thrust generated along the body, due to the relatively uniform shape of eels.

Three-dimensional flow structures and vorticity control in fish-like swimming

We employ a three-dimensional, nonlinear inviscid numerical method, in conjunction with experimental data from live fish and from a fish-like robotic mechanism, to establish the three-dimensional

Hydrodynamics of unsteady fish swimming and the effects of body size: comparing the flow fields of fish larvae and adults.

The rapid decrease in vortex circulation and the severe reduction in the coasting distance due to viscous drag contribute to the high cost that larvae - unlike adult fish - face when using a burst-and-coast swimming style.

Biofluiddynamic scaling of flapping, spinning and translating fins and wings

An integrated approach to scale the biological fluid dynamics of a wing that flaps, spins or translates is presented, which gives fundamental insight into the physical mechanisms that explain the differences in performance among flapping, spinning and translating wings.

Hydromechanics of swimming propulsion. Part 1. Swimming of a two-dimensional flexible plate at variable forward speeds in an inviscid fluid

  • T. Y. Wu
  • Engineering
    Journal of Fluid Mechanics
  • 1971
The most effective movements of swimming aquatic animals of almost all sizes appear to have the form of a transverse wave progressing along the body from head to tail. The main features of this