Decoding the Relationships between Body Shape, Tail Beat Frequency, and Stability for Swimming Fish
Decoding the Relationships between Body Shape, Tail Beat Frequency, and Stability for Swimming Fish
复制标题
破解鱼的体型、尾拍频率和稳定性之间的关系
DOI：
10.3390/fluids5040215
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发表时间：
2020-12-01
期刊：
影响因子：
1.9
通讯作者：
Tytell, Eric
中科院分区：
文献类型：
--
作者：
Hoover, Alexander P.;Tytell, Eric
当鱼在流动的环境中游泳时，它们必须积极地协调使用它们的鳍来稳定它们的运动，并有一个强健的运动形式。然而，人们对这些力量如何作用于鱼的身体知之甚少。在这项研究中，我们使用一个三维沉浸式边界模型来解码鱼体的横摇、俯仰和偏航与作用在柔性鱼体上的驱动力之间的关系。使用蓝鳍太阳鱼作为我们的典型几何形状，我们首先研究了驱动扭矩对鱼类模型稳定性的作用，并在不受约束的鱼体的头部施加扭矩。由此产生的运动学是被动弹性、流体力和驱动力矩的产物。然后，我们研究一个受约束的模型，以了解鳍几何形状、身体弹性和频率对作用于鱼的校正力范围所起的作用。我们发现非单调行为与频率有关，这表明鳍的有效灵活性对游泳成绩起着重要作用。
As fish swim through a fluid environment, they must actively use their fins in concert to stabilize their motion and have a robust form of locomotion. However, there is little knowledge of how these forces act on the fish body. In this study, we employ a 3D immersed boundary model to decode the relationship between roll, pitch, and yaw of the fish body and the driving forces acting on flexible fish bodies. Using bluegill sunfish as our representative geometry, we first examine the role of an actuating torque on the stability of the fish model, with a torque applied at the head of the unconstrained fish body. The resulting kinematics is a product of the passive elasticity, fluid forces, and driving torque. We then examine a constrained model to understand the role that fin geometry, body elasticity, and frequency play on the range of corrective forces acting on the fish. We find non-monotonic behavior with respect to frequency, suggesting that the effective flexibility of the fins play an important role in the swimming performance.