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Numerical and experimental studies on cloaked arrays of truncated cylinders under different wave directions

机译：截短圆柱体在不同波向下的隐身阵列的数值和实验研究

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摘要

The cloaking phenomenon in arrays of truncated surface-piercing cylinders under different wave directions is investigated by numerical and experimental methods. Two arrangements, consisting of an inner cylinder surrounded by either four or eight outer cylinders, are considered to confirm this cloaking phenomenon and to find the effect of the wave direction. The cloaking configurations of the cylinders for a certain wave frequency and a certain wave direction are determined via a real-coded genetic algorithm to minimize the scattered wave energy of the cylinder array. Experiments in a wave basin are designed to measure the free-surface elevation at multiple locations in the vicinity of the inner cylinder and the wave drift force on the inner cylinder at various wave-numbers under different wave directions. Both the wave drift force and the wave elevation show good agreement between the numerical and experimental results. It is found that the reduction in the wave drift force acting on the inner cylinder in a cloaking configuration is due to the improvement of the wave elevation in the vicinity of the inner cylinder. Furthermore, the effect of the wave direction on the cloaking phenomenon is significant for the configuration with four outer cylinders, but it is negligible for eight outer cylinders.
机译：通过数值和实验方法研究了在不同的波向下截短的表面穿孔圆柱阵列的隐身现象。考虑两个布置，一个由四个或八个外圆柱包围的内圆柱，以确认这种掩盖现象并找到波方向的影响。通过实数编码遗传算法确定圆柱体在特定波频率和特定波方向上的隐身配置，以最小化圆柱体阵列的散射波能量。设计了一个在波盆中进行的实验，以测量内圆柱体附近多个位置的自由表面高度，以及在不同波向下以不同波数对内圆柱体的波动力。波漂移力和波高都在数值和实验结果之间显示出良好的一致性。已经发现，以隐蔽构造作用在内筒上的波动力的减小是由于内筒附近的波高的提高。此外，波方向对隐身现象的影响对于具有四个外圆柱的构造是显着的，但是对于八个外圆柱则可以忽略。

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