This numerical study investigated the influence of the heave plate's diameter on the amplitude of the transitional motions of a marine circular cylinder (MCC) with a low aspect ratio under the marine current and regular waves. Due to the experimental model of the straked MCC, different diameters of the circular heave plate were chosen to be installed at the keel of the 3-straked MCC. In this numerical study, the diameter of the heave plate varied from 1.2 to 1.6 DMCC, while other parameters, such as reduced velocity (VR), Reynolds (Re) number, and Froude number, were kept constant. In this study, the transitional motions, including surge, sway, and heave, were analyzed. The results showed that increasing the heave plate's diameter decreased the amplitude of the transitional motions in both marine current and regular waves. Also, the finding revealed that the heave plate not only reduced the amplitude of the heave motion but also decreased the amplitude of surge and sway motions. Moreover, the outcomes indicated that the heave plate's diameter increased by approximately 20%–40% more than the MCC's diameter. This caused the smaller amplitude of the transitional motions under both marine currents and regular waves.

中文翻译：

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不同海况下垂荡板直径对有肋板船用圆柱体过渡运动的影响

本数值研究研究了在海流和规则波浪下，波动板直径对低纵横比海洋圆柱体（MCC）过渡运动振幅的影响。根据列式MCC的实验模型，选择不同直径的圆形波动板安装在3列式MCC的龙骨处。在这项数值研究中，垂荡板的直径从 1.2 到 1.6 DMCC 变化，而其他参数，例如折减速度 (VR)、雷诺 (Re) 数和弗劳德数，保持不变。在这项研究中，分析了过渡运动，包括喘振、摇摆和升沉。结果表明，增加波动板的直径会降低海流和规则波浪中过渡运动的幅度。此外，研究结果表明，垂荡板不仅减少了垂荡运动的幅度，而且还减少了纵荡和摇摆运动的幅度。此外，结果表明，波动板的直径比 MCC 的直径增加了约 20%–40%。这导致海流和规则波浪下的过渡运动幅度较小。