Self-propelled swimming of a flexible plunging foil near a solid wall
Self-propelled swimming of a flexible plunging foil near a solid wall
复制标题
柔性浸水箔在实心壁附近的自推进游动
DOI：
10.1088/1748-3190/11/4/046005
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发表时间：
2016-08-01
影响因子：
3.4
通讯作者：
Zhang, Xing
中科院分区：
文献类型：
--
作者：
Dai, Longzhen;He, Guowei;Zhang, Xing
通过数值模拟研究了固体壁面对柔性俯冲翼片自航运动的影响。研究发现，实心墙的存在提高了巡航速度，但增加了输入功率。刚性翼型在实心壁面附近游动时，可以获得较高的巡航速度，但推进效率可能会降低。具有一定灵活性的翼片可以享受巡航速度和推进效率的增强。在近壁游泳中，柔性翼片的另一个优点是产生较小的平均侧向力。文中还研究了壁面约束对尾迹结构和旋涡动力学的影响。本研究的结果对水生动物所经历的非定常壁效应有了一定的了解，也为能够利用壁效应的仿生水下航行器的设计提供了参考。
Numerical simulations are conducted to investigate the influences of a solid wall on the self-propelled swimming of a flexible plunging foil. It is found that the presence of a solid wall enhances the cruising speed, with the cost of increasing input power. Rigid foil can achieve high percentage increase in cruising speed when swimming near a solid wall, but the propulsive efficiency may be reduced. Foils with some flexibility can enjoy the enhancements in both cruising speed and propulsive efficiency. Another advantage of the flexible foils in near-wall swimming is that smaller averaged lateral forces are produced. The effects of wall confinement on the wake structure and the vortex dynamics are also studied in this paper. The results obtained in this study shed some light on the unsteady wall effect experienced by aquatic animals and also inform the design of bio-mimetic underwater vehicles which are capable of exploiting the wall effect.