Hydrodynamics of Vortex Generation during Bell Contraction by the Hydromedusa Eutonina indicans (Romanes, 1876)
Hydrodynamics of Vortex Generation during Bell Contraction by the Hydromedusa Eutonina indicans (Romanes, 1876)
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DOI：
10.3390/biomimetics4030044
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发表时间：
2019-09-01
期刊：
影响因子：
4.5
通讯作者：
Dabiri, John O.
中科院分区：
文献类型：
--
作者：
Costello, John H.;Colin, Sean P.;Dabiri, John O.
本文记录了一个以直线运动为主的Eutonina indicans（Romanes，1876）水母在多个脉动周期中的泳钟运动学和流体动力学尾流结构，泳钟收缩产生了一对旋转方向相反的涡环。对这些尾流结构中的动量通量的分析表明，涡旋动力学与水母游动速度的变化直接相关。此外，大量的动量通量在尾流空间集中在相反旋转的涡环之间的界面。类似的产生推力的尾流结构已经在鱼类游泳的模型中描述过，该模型将涡环作为从身体弯曲的位置到相互作用的相反符号的涡环对将流加速成线性推进射流的区域的能量传输的载体。这些发现支持了软机器人仿生推进的努力。
Swimming bell kinematics and hydrodynamic wake structures were documented during multiple pulsation cycles of a Eutonina indicans (Romanes, 1876) medusa swimming in a predominantly linear path. Bell contractions produced pairs of vortex rings with opposite rotational sense. Analyses of the momentum flux in these wake structures demonstrated that vortex dynamics related directly to variations in the medusa swimming speed. Furthermore, a bulk of the momentum flux in the wake was concentrated spatially at the interfaces between oppositely rotating vortices rings. Similar thrust-producing wake structures have been described in models of fish swimming, which posit vortex rings as vehicles for energy transport from locations of body bending to regions where interacting pairs of opposite-sign vortex rings accelerate the flow into linear propulsive jets. These findings support efforts toward soft robotic biomimetic propulsion.