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首页> 外文期刊>Ocean Engineering >Developing three dimensional potential solver for investigation of propulsion performance of rigid and flexible oscillating foils
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Developing three dimensional potential solver for investigation of propulsion performance of rigid and flexible oscillating foils

机译：开发三维电势求解器，以研究刚性和柔性振荡箔的推进性能

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摘要

Heave and pitch motion of an oscillating airfoil in uniform flow will cause generation of forwarding thrust. Applying a combination of these two motions on flexible foil, one can increase thrust and therefore the efficiency. This is the way that most fishes and other flying animals uses to consume less energy. In this paper, hydrodynamic forces and efficiency of an oscillating airfoil is investigated. A code is developed based on potential flow formulation in combination with Time Stepping Method (TSM) with nonlinear free shear layer dynamic approach to predict the wake behind the lifting bodies. A linear Morino type Kutta condition has been implemented on panels adjacent to trailing edge. In this methodology, there is no need to define the wake shape before starting the simulation and it is an important feature in treating the hydrodynamics of submerged bodies. To validate the presented algorithm, some test cases were investigated. Comparison of propulsion performance of rigid oscillating foil with flexible undulating in different Strouhal number is the novelty of our research. We observe that in a wide range of frequencies, undulation movements is more efficient than rigid oscillations. The numerical results show a good agreement related to analytical and experimental measurements.
机译：振荡翼型以均匀流动的升沉和俯仰运动将导致产生前推力。将这两个动作组合应用到柔性箔上，可以增加推力，从而提高效率。这是大多数鱼类和其他飞行动物消耗较少能量的方式。在本文中，研究了动翼的流体动力和效率。根据潜在的流量公式，结合时间步长方法（TSM）和非线性自由剪切层动态方法，开发了一个代码来预测提升体背后的尾流。在与后缘相邻的面板上已实现线性Morino型Kutta条件。在这种方法中，无需在开始模拟之前定义尾流形状，这是处理水下物体的流体动力学的重要特征。为了验证提出的算法，研究了一些测试案例。在不同的Strouhal数下比较刚性波动箔和柔性波动箔的推进性能是我们研究的新颖之处。我们观察到，在很宽的频率范围内，起伏运动比刚性振荡更有效。数值结果显示出与分析和实验测量相关的良好一致性。

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