The three-dimensional hydrodynamics of thunniform swimming under self-propulsion

Xia, Dan; Chen, Weishan; Liu, Junkao; Wu, Zhijun; Cao, Yangjie

doi:10.1016/j.oceaneng.2015.10.008

Cited by 44 publications

(26 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior is consistent with previous self-propelled investigations [29, 51] and the final mean value is called the cruising velocity V s .…”

Section: Problem Description and Numerical Methodssupporting

confidence: 91%

“…In the present work α is taken as 2, which coincides with previous studies on typical thunniform swimmers [51, 61]. In order to match with previous numerical and experimental work in our laboratory [2, 56], the wave number k is set at zero in the current simulations.…”

Section: Problem Description and Numerical Methodsmentioning

confidence: 93%

“…However, if we simply employ Eq (1) to describe the undulation of the flexible rear body, the fish body would be elongated during movement, just as the results shown in a number of past numerical studies [2, 10, 22, 51] on thunniform bio-inspired swimming. In view of this, non-elongating swimmers are considered in the studies of Tytell et al .…”

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

“…[61] and the simulation of Xia et al . [51] by virtual thunniform fish). In our study, the amplitude envelope is given the form of a polynomial with adjustable order, where x r denotes the x coordinate at the beginning of the rear 1/3 of the body, where the undulating amplitude is minimum; l r denotes the length of the rear 1/3 of the body; A p is the undulating amplitude of the tail peduncle end at which the amplitude is maximum; α is the order of the shape function, adjustable to attain a specific form of A ( x ).…”

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

“…Xia et al . [51] investigated the hydrodynamics under self-propulsion using a tuna-inspired computational model with thunniform kinematics.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical study on the hydrodynamics of thunniform bio-inspired swimming under self-propulsion

Liu

2017

PLoS ONE

View full text Add to dashboard Cite

Numerical simulations are employed to study the hydrodynamics of self-propelled thunniform swimming. The swimmer is modeled as a tuna-like flexible body undulating with kinematics of thunniform type. The wake evolution follows the vortex structures arranged nearly vertical to the forward direction, vortex dipole formation resulting in the propulsion motion, and finally a reverse Kármán vortex street. We also carry out a systematic parametric study of various aspects of the fluid dynamics behind the freely swimming behavior, including the swimming speed, hydrodynamic forces, power requirement and wake vortices. The present results show that the fin thrust as well as swimming velocity is an increasing function of both tail undulating amplitude Ap and oscillating amplitude of the caudal fin θm. Whereas change on the propulsive performance with Ap is associated with the strength of wake vortices and the area of suction region on the fin, the swimming performance improves with θm due to the favorable tilting of the fin that make the pressure difference force more oriented toward the thrust direction. Moreover, the energy loss in the transverse direction and the power requirement increase with Ap but decrease with θm, and this indicates that for achieving a desired swimming speed increasing θm seems more efficiently than increasing Ap. Furthermore, we have compared the current simulations with the published experimental studies on undulatory swimming. Comparisons show that our work tackles the flow regime of natural thunniform swimmers and follows the principal scaling law of undulatory locomotion reported. Finally, this study enables a detailed quantitative analysis, which is difficult to obtain by experiments, of the force production of the thunniform mode as well as its connection to the self-propelled swimming kinematics and vortex wake structure. The current findings help provide insights into the swimming performance and mechanisms of self-propelled thunniform locomotion.

show abstract

“…This behavior is consistent with previous self-propelled investigations [29, 51] and the final mean value is called the cruising velocity V s .…”

Section: Problem Description and Numerical Methodssupporting

confidence: 91%

Section: Problem Description and Numerical Methodsmentioning

confidence: 93%

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

Section: Problem Description and Numerical Methodsmentioning

confidence: 99%

“…Xia et al . [51] investigated the hydrodynamics under self-propulsion using a tuna-inspired computational model with thunniform kinematics.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical study on the hydrodynamics of thunniform bio-inspired swimming under self-propulsion

Liu

2017

PLoS ONE

View full text Add to dashboard Cite

show abstract

Hydrodynamics of the self-diving function of thunniform swimmer relying on switching the caudal fin shape

2023

View full text Add to dashboard Cite

A Review: From Aquatic Lives Locomotion to Bio-inspired Robot Mechanical Designations

Bao,

Shi,

Duan

et al. 2023

J Bionic Eng

View full text Add to dashboard Cite

The three-dimensional hydrodynamics of thunniform swimming under self-propulsion

Cited by 44 publications

References 43 publications

Numerical study on the hydrodynamics of thunniform bio-inspired swimming under self-propulsion

Numerical study on the hydrodynamics of thunniform bio-inspired swimming under self-propulsion

Hydrodynamics of the self-diving function of thunniform swimmer relying on switching the caudal fin shape

A Review: From Aquatic Lives Locomotion to Bio-inspired Robot Mechanical Designations

Contact Info

Product

Resources

About