NUMERICAL STUDIES ON LOCOMOTION PERFROMANCE OF FISHLIKE TAIL FINS

Flapping plates of typical fishlike tail shapes are simulated to investigate their locomotion performance using the multi-block Lattice Boltzmann Method （LBM） and Immersed Boundary （IB） method. Numerical results show that fishlike forked configurations have better locomotion performance compared wit...

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Bibliographic Details
Published inJournal of hydrodynamics. Series B Vol. 24; no. 4; pp. 488 - 495
Main Authors Li, Gao-jin, Zhu, Luodin, Lu, Xi-yun
Format Journal Article
LanguageEnglish
Published Singapore Springer Singapore 01.08.2012
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China%Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, Indianapolis,IN 46202, USA
Subjects
Engineering
Engineering Fluid Dynamics
Hydrology/Water Resources
Numerical and Computational Physics
Simulation
尾翼
数值研究
数值结果
格子玻尔兹曼方法
涡旋结构
生物学特性
运动性能
鱼
forked-tail fin
carangiform and thunniform modes
Immersed Boundary (IB) method
three-dimensional (3-D) flapping plate
multi-block Lattice Boltzmann Method (LBM)
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Summary:Flapping plates of typical fishlike tail shapes are simulated to investigate their locomotion performance using the multi-block Lattice Boltzmann Method （LBM） and Immersed Boundary （IB） method. Numerical results show that fishlike forked configurations have better locomotion performance compared with unforked plates. Based on our results, the caudal fin in carangi- form mode has greater thrust, and the lunate tail fin in thtmniform mode has higher efficiency. These findings are qualitatively con- sistent with biological observations of fish swimming. Analysis of wake topology shows that the wake of the forked plate consists of a chain of alternating reverse horseshoe-like vortical structures. These structures induce a backward jet and generate a positive thrust. Moreover, this backward jet has a more favorable direction compared with that behind an unforked plate.
Bibliography:31-1563/T
carangiform and thunniform modes, forked-tail fin, three-dimensional （3-D） flapping plate, multi-block LatticeBoltzmann Method （LBM）, Immersed Boundary （IB） method
Flapping plates of typical fishlike tail shapes are simulated to investigate their locomotion performance using the multi-block Lattice Boltzmann Method （LBM） and Immersed Boundary （IB） method. Numerical results show that fishlike forked configurations have better locomotion performance compared with unforked plates. Based on our results, the caudal fin in carangi- form mode has greater thrust, and the lunate tail fin in thtmniform mode has higher efficiency. These findings are qualitatively con- sistent with biological observations of fish swimming. Analysis of wake topology shows that the wake of the forked plate consists of a chain of alternating reverse horseshoe-like vortical structures. These structures induce a backward jet and generate a positive thrust. Moreover, this backward jet has a more favorable direction compared with that behind an unforked plate.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(11)60270-9