NUMERICAL STUDIES ON LOCOMOTION PERFROMANCE OF FISH-LIKE TAIL FINS  

作　　者：LI Gao-jin ZHU Luodin LU Xi-ytm 

机构地区：[1]Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China [2]Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, Indianapolis,IN 46202, USA

出　　处：《Journal of Hydrodynamics》2012年第4期488-495,共8页水动力学研究与进展B辑（英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 10832010);the Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-YW-L05);the 111 Project (Grant No. B07033)

摘　　要：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.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.

关 键 词：carangiform and thunniform modes forked-tail fin three-dimensional （3-D） flapping plate multi-block LatticeBoltzmann Method （LBM） Immersed Boundary （IB） method 

分 类 号：U469.11[机械工程—车辆工程] P435[交通运输工程—载运工具运用工程]