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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Heave and Flow: Understanding the role of resonance and shape evolution for heaving flexible panels
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Heave and Flow: Understanding the role of resonance and shape evolution for heaving flexible panels

机译：APS-APS流体动力学分部第70届年会-事件-升沉和流动：了解共振和形状演变对于起伏柔性面板的作用

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摘要

Many animals that swim or fly use their body to accelerate the fluid around them, transferring momentum from their bodies to the surrounding fluid. The emergent kinematics from this transfer are a result of the coupling between the fluid and the material properties of the body. Here we present a computational study of a 3-dimensional flexible panel that is heaved at its leading edge in an incompressible, viscous fluid. These high-fidelity numerical simulations enable us to examine the role of resonance, fluid forces, and panel deformations have on swimming performance. Varying both the passive material properties and the heaving frequency of the panel, we find peaks in trailing edge amplitude and forward swimming speed are determined by a dimensionless quantity, the effective flexibility. Modal decompositions of panel deflections reveal that the strength of each mode is related to the effective flexibility and peaks in the swimming speed and trailing edge amplitude correspond to peaks in the contributions of different modes. Panels of different material properties but with similar effective flexibilities have modal contributions that evolve similarly over the phase of the heaving cycle and agreement in dominant vortex structures generated by the panel.
机译：许多游泳或飞行的动物都利用身体来加速周围的液体，从而将动量从身体转移到周围的液体中。这种转移产生的运动学是流体与人体材料特性之间耦合的结果。在这里，我们介绍了对3维柔性面板的计算研究，该面板在其前缘沉入了不可压缩的粘性流体中。这些高保真数值模拟使我们能够检查共振，流体力和面板变形对游泳性能的作用。改变面板的被动材料特性和起伏频率，我们发现后缘振幅和前向游泳速度的峰值由无量纲的量和有效的柔韧性决定。面板挠度的模态分解表明，每种模态的强度与有效柔韧性有关，游泳速度和后缘振幅的峰值对应于不同模态贡献的峰值。具有不同材料特性但具有相似有效柔韧性的面板具有模态贡献，该模态贡献在升沉周期的阶段中相似地演变，并且在面板产生的主导涡结构中一致。

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