Flexible body with drag independent of the flow velocity
Flexible body with drag independent of the flow velocity
复制标题
具有与流速无关的阻力的柔性体
DOI：
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发表时间：
2013
影响因子：
3.7
通讯作者：
E. de Langre
中科院分区：
文献类型：
--
作者：
T. Barois;E. de Langre
摘要刚性物体的阻力随流速的增加而增加。对于通常遇到的宽范围的速度，阻力随着流体的相对速度的平方而增加。负载对速度的这种强烈依赖性说明了被动生命系统（例如风中的植物或海洋环境中的藻类）所采用的特定生存策略：通过弹性重新配置，与刚性配置相比，植物上的阻力减小，并且阻力的速度指数通常在1和1.5之间。在这项工作中，膜配置呈现出几乎独立的自由流速度的阻力。这个令人惊讶的结果被证明是非常稳健的，因为它是实验观察到的一系列几何形状。这项研究开辟了一条道路，为设计的设备受到的阻力是独立的流速。这种可能性在涉及被拖曳或经受风的柔性结构的各种领域中构成关键点。
Abstract The drag of a rigid object is expected to increase with flow velocity. For wide ranges of velocities commonly encountered, the drag increases as the square of the relative velocity of the fluid. This strong dependence of the load on the velocity accounts for specific survival strategies adopted by passive living systems such as plants in wind or algae in marine environments: through elastic reconfiguration, the drag on plants is reduced when compared to a rigid configuration and the velocity exponent for the drag is typically found to be between 1 and 1.5. In this work, a membrane configuration is presented that exhibits a drag force that is almost independent of the free-stream velocity. This surprising result is shown to be remarkably robust as it is experimentally observed for a range of geometries. This study opens the way for the design of devices subjected to a drag that is independent of the flow velocity. This possibility constitutes a key point in various fields involving flexible structures that are towed or subjected to wind.