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Wake topology and hydrodynamic performance of low-aspect-ratio flapping foils

机译:低纵横比拍打箔的尾迹拓扑结构和水动力性能

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摘要

Numerical simulations are used to investigate the effect of aspect ratio on the wake topology and hydrodynamic performance of thin ellipsoidal flapping foils. The study is motivated by the quest to understand the hydrodynamics of fish pectoral fins. The simulations employ an immersed boundary method that allows us to simulate flows with complex m:)ving boundaries on fixed Cartesian grids. A detailed analysis of the vortex topology shows that the wake of low-aspect-ratio flapping foils is dominated by two sets of interconnected vortex loops that evolve into distinct vortex rings as they convect downstream. The flow downstream of these flapping foils is characterized by two oblique jets and the implications of this characteristic on the hydrodynamic performance are examined. Simulations are also used to examine the thrust and propulsive efficiency of these foils over a range of Strouhal and Reynolds numbers as well as pitch-bias angles.
机译:数值模拟用于研究纵横比对薄椭圆形扑翼箔的尾流拓扑和流体力学性能的影响。该研究的动机是寻求了解鱼胸鳍的水动力。模拟采用沉浸式边界方法,使我们可以模拟固定笛卡尔网格上具有复杂m :)边界的流。对涡旋拓扑的详细分析表明,低纵横比的拍打箔片的尾波主要受两组相互连接的涡旋环的控制,当它们在下游对流时,它们会演变成不同的涡旋环。这些拍打箔片的下游流动以两个斜射流为特征,并研究了该特征对流体力学性能的影响。模拟还用于检查这些箔在一定的Strouhal和Reynolds数以及螺距偏角范围内的推力和推进效率。

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