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论文类型：期刊论文

发表时间：2019-07-01

发表刊物：OCEAN ENGINEERING

收录刊物：SCIE、EI

卷号：183

页面范围：305-317

ISSN号：0029-8018

关键字：Truncated cylinders; Cloaking; Wave drift force; Free-surface elevation; Wave direction effect

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.