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首页> 美国卫生研究院文献>Proceedings. Mathematical Physical and Engineering Sciences >Does flutter prevent drag reduction by reconfiguration?
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Does flutter prevent drag reduction by reconfiguration?

机译：颤动是否可以防止通过重新配置减少阻力？

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摘要

The static reconfiguration of flexible beams exposed to transverse flows is classically known to reduce the drag these structures have to withstand. But the more a structure bends, the more parallel to the flow it becomes, and flexible beams in axial flows are prone to a flutter instability that is responsible for large inertial forces that drastically increase their drag. It is, therefore, unclear whether flexibility would still alleviate, or on the contrary enhance, the drag when flapping occurs on a reconfiguring structure. In this article, we perform numerical simulations based on reduced-order models to demonstrate that the additional drag induced by the flapping motion is almost never significant enough to offset the drag reduction due to reconfiguration. Isolated and brief snapping events may transiently raise the drag above that of a rigid structure in the particular case of heavy, moderately slender beams. But apart from these short peak events, the drag force remains otherwise always significantly reduced in comparison with a rigid structure.
机译：传统上已知暴露于横向流的柔性梁的静态重配置以减小这些结构必须承受的阻力。但是，结构弯曲得越多，它就越平行于流动，并且轴向流动中的柔性梁容易产生颤振不稳定性，这是导致较大惯性力并导致其阻力急剧增加的原因。因此，尚不清楚柔韧性是否仍将减轻或相反地增强在重新构造结构上发生拍打时的阻力。在本文中，我们基于降阶模型执行数值模拟，以证明由拍动引起的额外阻力几乎永远不会足以抵消由于重新配置而导致的阻力减小。在重，中度细长的梁的特定情况下，孤立的和短暂的卡扣事件可能会使阻力暂时超过刚性结构。但是除了这些短暂的峰值事件外，与刚性结构相比，阻力始终保持显着降低。

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