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Two-dimensional flow characteristics of wave interactions with a free-rolling rectangular structure

机译:具有自由滚动矩形结构的波相互作用的二维流动特性

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This paper presents laboratory observations of flow characteristics for regular waves passing a rectangular structure in a two-dimensional wave tank. The structure with a draft one-half of its height was hinged at the center of gravity and free to roll (one degree of freedom) by waves. Particle image velocimetry (PIV) was used to measure the velocity field in the vicinity of the structure. The mean velocity and turbulence properties were obtained by phase-averaging the PIV velocity maps from repeated test runs. Since the viscous damping (also called the eddy making damping) in a vortical flow affects the roll motion of a blunt body, the quantitative flow pattern was represented to elucidate the coupled interactions between the body motion and the waves. Additionally, the turbulence properties including the turbulence length scale and the turbulent kinetic energy budget were investigated to characterize the interactions. The results show that vortices were generated near the structure corners at locations opposing to that of the roll damping effect for waves with a period longer than the roll natural period of the structure.
机译:本文介绍了二维波箱中规则波通过矩形结构的流动特性的实验室观测结果。高度为吃水高度一半的结构铰接在重心处,并通过波浪自由滚动(一个自由度)。粒子图像测速(PIV)用于测量结构附近的速度场。平均速度和湍流特性是通过对重复测试运行的PIV速度图进行相位平均获得的。由于涡流中的粘性阻尼(也称为涡流阻尼)会影响钝体的侧倾运动,因此可以通过定量流动模式来阐明体运动与波浪之间的耦合相互作用。另外,研究了湍流特性,包括湍流长度尺度和湍流动能收支,以表征相互作用。结果表明,对于周期长于结构的侧倾自然周期的波浪,在结构拐角附近的位置产生了与侧倾阻尼效应相反的涡旋。

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