Three-dimensional biological hydrodynamics study on various types of batoid fishlike locomotion

Thekkethil, Namshad; Sharma, Atul; Agrawal, Amit

doi:10.1103/physrevfluids.5.023101

Cited by 27 publications

(17 citation statements)

References 26 publications

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“…2019; Thekkethil et al. 2020 b ). However, there are some distinct features in the shape and formation of these structures among different wavenumbers.…”

Section: Effects Of Chordwise Deformationmentioning

confidence: 99%

“…A similar definition was also used in Thekkethil et al. (2020 b ) and for some anguilliform and carangiform swimmers (Maertens, Triantafyllou & Yue 2015; Zhang et al. 2018).…”

Section: Effects Of Chordwise Deformationmentioning

confidence: 99%

“…The effect of the active deformation on the LEV has not been investigated. An earlier work (Thekkethil, Sharma & Agrawal 2020 b ) investigated the effect of chordwise wavelengths on force production. However, the model was simplified into an ellipsoid with a hydrofoil section, and the focus was to identify the near-field wake structures.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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 parameters were represented by the wavenumber ( $W$ ) and the ratio of the half-amplitude above the longitudinal axis to that below ( $HAR$ ). Fin kinematics were prescribed based on biological data. Simulations were conducted using the immersed boundary method. It was found that moderate chordwise deformation enhances the thrust, saves the power and increases the efficiency. A large $HAR$ can also increase thrust performance. By using the derivative-moment transformation theory at several subdomains to capture the local vortical structures and a force decomposition, it was shown that, at high Strouhal numbers ( $St$ ), the tip vortex is the main source of thrust, whereas the leading-edge vortex (LEV) and trailing-edge vortex weaken the thrust generation. However, at lower $St$ , the LEV would enhance the thrust. The least deformation ( $W=0$ ) leads to the largest effective angle of attack, and thus the strongest vortices. However, moderate deformation ( $W=0.4$ ) has an optimal balance between the performance enhancement and the opposite effect of different local structures. The performance enhancement of $HAR$ was also due to the increase of the vortical contributions. This work provides a new insight into the role of vortices and the force enhancement mechanism in aquatic swimming.

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“…2019; Thekkethil et al. 2020 b ). However, there are some distinct features in the shape and formation of these structures among different wavenumbers.…”

Section: Effects Of Chordwise Deformationmentioning

confidence: 99%

“…A similar definition was also used in Thekkethil et al. (2020 b ) and for some anguilliform and carangiform swimmers (Maertens, Triantafyllou & Yue 2015; Zhang et al. 2018).…”

Section: Effects Of Chordwise Deformationmentioning

confidence: 99%

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

et al. 2021

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“…In a simple model analysis, the ratio of the two methods of thrust generation (added mass and circulation) was examined, and it was found that the ratio of thrust generation by circulation was higher 5 . The relationship between the aspect ratio of the pectoral fin and swimming performance was investigated, and it was found that thrust and propulsive efficiency increased as the aspect ratio of the pectoral fin increased 6 . It was also clarified that the propulsive efficiency is improved by using the ground effect in both oscillation and undulation 7 – 10 .…”

Section: Introductionmentioning

confidence: 99%

Changes in rays’ swimming stability due to the phase difference between left and right pectoral fin movements

Sumikawa

Naraoka

Fukue

et al. 2022

Sci Rep

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Swimming motions of rays that swim using undulation locomotion are not always symmetrical; there may be a phase difference between the left and right pectoral fins. However, few studies on the swimming of rays have mentioned left and right pectoral fin movements. Moreover, the effects of movements of the left and right pectoral fins on swimming have not been clarified. This paper describes a computational study of phase differences of pectoral fin movements in the swimming of rays with the validity of fluid analysis methods. The movement and shape of the ray were made based on previous biological research and pictures. An overset grid was used to reproduce the ray’s complex motions. The analysis was performed under four phase difference conditions: 0 $$T$$ T ($$T$$ T is the period), 0.25 $$T$$ T , 0.5 $$T$$ T , and 0.75 $$T$$ T . The results show that a phase difference between the left and right pectoral fin movements affects swimming stability and maneuverability but not propulsive efficiency. We suggest that the phase difference in pectoral fin movements is essential for the swimming of rays, and rays adjust the phase difference between the movement of the left and right pectoral fins to suit their purpose.

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“…2012), underwater flight of the manta (Fish et al. 2016), batoid fish-like locomotion (Thekkethil, Sharma & Agrawal 2020) and heaving motion (Visbal, Yilmaz & Rockwell 2013).…”

Section: Introductionmentioning

confidence: 99%

Dependence of wake structure on pitching frequency behind a thin panel at

Sarkar

2021

J. Fluid Mech.

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Three-dimensional biological hydrodynamics study on various types of batoid fishlike locomotion

Cited by 27 publications

References 26 publications

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

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

Changes in rays’ swimming stability due to the phase difference between left and right pectoral fin movements

Dependence of wake structure on pitching frequency behind a thin panel at

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