A Numerical Study of Jet Propulsion of an Oblate Jellyfish Using a Momentum Exchange-Based Immersed Boundary-Lattice Boltzmann Method  

作　　者：Hai-Zhuan Yuan Shi Shu Xiao-Dong Niu Mingjun Li Yang Hu 

机构地区：[1]School of Mathematics and Computational Science,Xiangtan University,Xiangtan 411105,China [2]Department of Mechatronics,College of Engineering,Shantou University,Shantou 515063,China

出　　处：《Advances in Applied Mathematics and Mechanics》2014年第3期307-326,共20页应用数学与力学进展（英文）

基　　金：the One Hundred Person Project of Hunan Province of China under Xiangtan University,and the Academic Frontier Research Project on”Next Generation Zero-emission Energy Conversion System”of Ministry of Education,Culture,Sports,Science and Technology of Japan,and NSFC Project(Grant No.91130002 and 11171281);Innovative Research Team in University of China(No.IRT1179);Specialized research Fund for the Doctoral Program of Higher Education(Grant No.20124301110003);Hunan Provincial Innovation Foundation for Postgraduate(CX2012B239)。

摘　　要：In present paper,the locomotion of an oblate jellyfish is numerically investigated by using a momentum exchange-based immersed boundary-Lattice Boltzmann method based on a dynamic model describing the oblate jellyfish.The present investigation is agreed fairly well with the previous experimental works.The Reynolds number and the mass density of the jellyfish are found to have significant effects on the locomotion of the oblate jellyfish.Increasing Reynolds number,the motion frequency of the jellyfish becomes slow due to the reduced work done for the pulsations,and decreases and increases before and after the mass density ratio of the jellyfish to the carried fluid is 0.1.The total work increases rapidly at small mass density ratios and slowly increases to a constant value at large mass density ratio.Moreover,as mass density ratio increases,the maximum forward velocity significantly reduces in the contraction stage,while the minimum forward velocity increases in the relaxation stage.

关 键 词：Lattice Boltzmann method immersed boundary method momentum exchange oblate jellyfish locomotion 

分 类 号：O57[理学—粒子物理与原子核物理]