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首页> 外文期刊>Proceedings of the Royal Society. 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：颤振防止重新配置减少？

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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：公知的柔性光束的静态重新配置是公知的，以减少拖动这些结构必须承受的拖动。但是，结构弯曲的结构越多，它变得更平行，并且轴向流中的柔性梁容易达到颤动的不稳定性，其负责大幅增加其阻力的惯性力。因此，目前尚不清楚灵活性是否仍然可以缓解，或相反增强，在重新配置结构上发生抖动时的拖动。在本文中，我们基于减少阶模型进行数值模拟，以证明由拍打运动引起的额外阻力几乎从不均可抵消由于重新配置而抵消减阻。孤立和简短的捕捉事件可能在重度，中间细长梁的特定情况下瞬时提高刚性结构的拖拉。但除了这些短峰峰活动之外，与刚性结构相比，阻力仍然显着降低。

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