Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction

doi:10.1007/s00348-021-03378-2

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction
	Tu, Han 4; Wang, FuJun 4; Wang HP(王洪平)2,3; Gao, Qi 4; Wei, RunJie 1
刊名	EXPERIMENTS IN FLUIDS
	2022
卷号	63 期号:1 页码:12
ISSN号	0723-4864
DOI	10.1007/s00348-021-03378-2
通讯作者	Gao, Qi(qigao@zju.edu.cn)
英文摘要	Volumetric measurement for the wake structures generated by a freely swimming zebra fish has been conducted by tomographic particle image velocimetry. The 3D flow visualization is recorded by four high speed cameras. The time-resolved three-dimensional flow structures are obtained and studied. lambda(ci)-criterion is applied to identify vortices induced by zebra fish locomotion, which clearly exhibits the instantaneous structures of three- dimensional vortex rings. Vortex rings are linked at angles and gradually lose coherence as they convect downstream. By investigating the distribution of momentum components and acceleration terms of the Navier-Stokes equations, it is found that vortex rings in the wake have an accelerating effect on the flow. And alternating orientations of vortex rings can result in a change of thrust direction between successive tailbeats. A pressure reconstruction technique is applied, revealing low pressure regions around vortex rings and relatively large pressure gradient at the connecting part of the linked vortex rings. Combined with the kinematic information of the flow field, the dynamic analysis introduced by the acceleration and pressure fields further strengthens the understanding of fish's propulsion mechanism.
分类号	二类
资助项目	National Key R & D Program of China[2020YFA040070]
WOS关键词	START ESCAPE RESPONSES ; HYDRODYNAMICS ; FIELD
WOS研究方向	Engineering ; Mechanics
语种	英语
WOS记录号	WOS:000740588300001
资助机构	National Key R & D Program of China
其他责任者	Gao, Qi
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88281]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.MicroVec Inc, Beijing 100083, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 4.Zhejiang Univ, Sch Aeronaut & Astronaut, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310027, Peoples R China;
推荐引用方式 GB/T 7714	Tu, Han,Wang, FuJun,Wang HP,et al. Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction[J]. EXPERIMENTS IN FLUIDS,2022,63(1):12.
APA	Tu, Han,Wang, FuJun,王洪平,Gao, Qi,&Wei, RunJie.(2022).Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction.EXPERIMENTS IN FLUIDS,63(1),12.
MLA	Tu, Han,et al."Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction".EXPERIMENTS IN FLUIDS 63.1(2022):12.