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首页> 外文期刊>Ocean Engineering >A three-dimensional wake impingement model and applications on tandem oscillating foils
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A three-dimensional wake impingement model and applications on tandem oscillating foils

机译：串联振荡箔的三维尾流碰撞模型及其应用

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摘要

Potential flow based vortex numerical methods have been widely used in aerodynamics and hydrodynamics. In these methods, vortices shed from lifting bodies are traced by using vortex filaments or dipole panels. When the wake elements encounter a downstream body, such as a rudder behind a propeller or a stator behind a rotor, a treatment is necessary to divert the wake elements to pass by the body. This treatment is vital to make wake simulations realistic and to satisfy the non-penetration condition during wake body interaction. It also helps to avoid pure numerical disturbances such as when a vortex filament or an edge of a dipole panel passes through the collection point of a body element; this is a singularity for induced velocity and it will introduce a large numerical disturbance. This necessary treatment for three-dimensional problems with geometrical complexity has not been found to date. In this study, a wake impingement model was developed to divert wake elements to slip over the body surface, model the vortex/body interaction, and predict forces on fluctuating components. The model was also tested on configurations of oscillating foils in tandem with an existing panel method code. Simulation results with the wake impingement model are shown to be in closer agreement with limited published experimental data than those without the model. With the established wake impingement model, force fluctuations on the after body due to the wake vortex impingement were investigated based on a series of simulations. The series varied several parameters including distance between two foils, oscillating frequency, span, rear foil pitch angle, swap angle and vertical position.
机译：基于势流的涡旋数值方法已广泛用于空气动力学和流体动力学。在这些方法中，通过使用涡旋丝或偶极子板来追踪从举升体散发出的涡旋。当尾流元件遇到下游主体时，例如螺旋桨后面的舵或转子后面的定子，必须进行处理以使尾流元件转移通过主体。这种处理对于使尾流模拟变得现实并满足尾流体交互过程中的非穿透条件至关重要。它还有助于避免纯粹的数值干扰，例如，当涡旋灯丝或偶极子面板的边缘穿过身体元素的采集点时；这是感应速度的奇点，会引入较大的数值扰动。迄今为止，尚未发现对具有几何复杂性的三维问题的必要处理。在这项研究中，开发了尾流撞击模型，以转移尾流元素在身体表面上滑动，对涡流/身体相互作用进行建模，并预测波动组件上的力。还使用现有的面板方法代码对模型进行了振动箔配置的测试。结果表明，与有限的实验数据相比，具有尾流冲击模型的仿真结果与没有模型的仿真结果更接近。利用建立的尾流冲击模型，基于一系列模拟研究了尾流涡流冲击在后车身上产生的力波动。该系列改变了几个参数，包括两个箔片之间的距离，振荡频率，跨度，后箔片俯仰角，交换角度和垂直位置。

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