Three-Dimensional Simulation of Self-propelled Fish-Like Body Swimming in a Channel
Three-Dimensional Simulation of Self-propelled Fish-Like Body Swimming in a Channel
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自航式鱼体在航道中游动的三维模拟
DOI：
10.1080/19942060.2018.1453381
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发表时间：
2018
影响因子：
6.1
通讯作者：
Hisashi KIHARA and Ken-ichi ABE
中科院分区：
文献类型：
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作者：
Yangrong ZHANG;Hisashi KIHARA and Ken-ichi ABE
本研究采用三维数值模拟的方法，对鱼形物体在防滑水槽中的运动特性进行了模拟，研究了运动对运动性能的影响。采用直接强迫浸没边界法研究了惯性坐标系中的自行体运动问题。该鱼体由多个刚体组成，其行为类似于多节段机器鱼。首先通过模拟雷诺数(Re)=100和Re=1000的圆柱体以及悬浮颗粒周围的流体流动对计算程序进行了验证。将计算结果与该领域以往研究的实验和数值结果进行了比较。然后对尾拍频率、相邻身体节段之间的相位差和身体幅度进行了虚拟参数研究。文中还讨论了模型体壁的横向和垂直距离对游泳成绩的影响。对模型体周向速度场和涡量场的计算结果为推力产生的机理提供了依据，并突出了运动学对游泳性能的影响。
In this study, a three-dimensional simulation of a fish-like body swimming in a channel with non-slip walls was carried out to investigate the effects of kinematics on swimming performance. Self-propelled swimming in an inertial coordinate system was examined by using the direct forcing immersed boundary method. The fish body consisted of several rigid bodies and behaved analogously to a multi-segment robotic fish. The computational program was first validated by simulating fluid flow around a circular cylinder at Reynolds number (Re) =100 and Re = 1000, as well as around a settling particle. The results were compared with experimental and numerical results from past research in the area. A virtual parametric study of the tail-beat frequency, phase difference between neighboring body segments, and body amplitude was then conducted. The effect of the lateral and vertical distance between the model body and walls on swimming performance is also discussed. The results for the velocity and vorticity fields around the model body provided evidence for the mechanism of thrust generation and highlighted the effects of kinematics on swimming performance.