Numerical study on the hydrodynamic performance of an unconstrained carangiform swimmer

Wu, Buchen1,2; Shu, Chang1; Lee, HsuChew2; Wan, Minping2,3,4

2022-12-01

10.1063/5.0128635

PHYSICS OF FLUIDS   影响因子和分区

1070-6631

1089-7666

Undulations are ubiquitous in natural swimmer propulsion, propelling in omni-direction. In the present work, the hydrodynamic performance of an unconstrained carangiform swimmer in the absence of a free stream is numerically investigated at different Reynolds numbers. Propulsive speed is found to increase with an increase in undulatory frequency, wavelength, and Reynolds number. The passive lateral oscillating amplitude is closely related to the wavelength and kinematic viscosity, but insensitive to the undulatory frequency. The propulsive mechanisms for the variation of the propulsive speed are revealed by the vortical structures and the time-averaged velocity field. Scaling relationships are investigated, and we found that the effects of the wavelength on the propulsive performance cannot be neglected at high Reynolds number, i.e., R e ref & GE; 1000, and the scaling relationship between the flapping Reynolds number and the propulsive Reynolds number is refined with the wavelength adopted as the characteristic length, which generalizes the previous scaling law proposed by Gazzola et al. [ "Scaling macroscopic aquatic locomotion, " Nat. Phys. 10, 758-761 (2014).] In addition, the scaling relationships related to the power consumption, the cost of transport, the Strouhal number, and the passive lateral oscillating amplitude are revealed. These results are crucial in furthering our understanding of carangiform's self-propulsion and will aid the development of advanced bio-inspired propulsors. Published under an exclusive license by AIP Publishing.

SCI

英语

通讯

Key-Area Research and Development Program of Guangdong Province[2021B0101190003] ; Shenzhen Science & Technology Program[KQTD20180411143441009] ; Department of Science and Technology of Guangdong Province["2019B21203001","2020B1212030001"]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000894726200019

AIP Publishing

PHYSICS

Web of Science

1.Natl Univ Singapore, Dept Mech Engn, 10 Kent Ridge Crescent, Singapore 119260, Singapore
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Guangdong Prov Key Lab Turbulence Res & Applicat, Shenzhen 518055, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Data Driven Fl, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Jiaxing Res Inst, Jiaxing 314031, Peoples R China

Wu, Buchen,Shu, Chang,Lee, HsuChew,et al. Numerical study on the hydrodynamic performance of an unconstrained carangiform swimmer[J]. PHYSICS OF FLUIDS,2022,34(12).

Wu, Buchen,Shu, Chang,Lee, HsuChew,&Wan, Minping.(2022).Numerical study on the hydrodynamic performance of an unconstrained carangiform swimmer.PHYSICS OF FLUIDS,34(12).

Wu, Buchen,et al."Numerical study on the hydrodynamic performance of an unconstrained carangiform swimmer".PHYSICS OF FLUIDS 34.12(2022).