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Hydrodynamic characteristics of forced oscillation of heave plate with fractal characteristics based on floating wind turbine platform
Ocean Engineering ( IF 5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.oceaneng.2020.107621 Bo Wang , Zifei Xu , Chun Li , Donghua Wang , Qinwei Ding
Ocean Engineering ( IF 5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.oceaneng.2020.107621 Bo Wang , Zifei Xu , Chun Li , Donghua Wang , Qinwei Ding
Abstract The heave plate is widely used in the field of marine engineering because of its advantage of increasing damping and added mass. In this paper, the fractal theory is applied to the structure design of the heave plate and a fractal plate has been proposed. With the technology of dynamic mesh and user defined functions (UDF) in Fluent, numerical simulations on forced oscillation of different heave plates have been performed. At different amplitudes of harmonic motion, the hydrodynamic characteristics of solid plate, different fractal order plates (perforation ratios of 5%, 12% and 20%, respectively) and regular ones (different shapes and arrangement of holes with the same perforation ratio of 20%) are compared and analyzed. The time history of vertical force, added mass coefficient (Cm) and damping coefficient (Cd) are obtained for different heave plates. The results show that at the same oscillation period, the Cd value of each heave plate decreases with the amplitude of harmonic motion increases, eventually becoming stable, while the Cm value increases continuously. When comparing different fractal heave plates, the Cm value decreases with the increase of the fractal order, while Cd value increases firstly and then decreases at the same condition. Besides, the Cd value reaches the maximum at the second order. As the hole perimeter becomes higher, the regular ones with the perforation ratio of 20% exhibits a linear increase in damping coefficient with increasing Keulegan-Carpenter Number (KC). The damping coefficient of a fractal plate is obviously larger than that of regular ones, which indicates that the fractal plate has better performance compared to regular ones.
中文翻译:
基于浮动式风力机平台的分形垂荡板受迫振荡水动力特性
摘要 升沉板由于具有增加阻尼和增加质量的优点而被广泛应用于海洋工程领域。本文将分形理论应用于垂荡板的结构设计,提出了一种分形板。借助Fluent中的动态网格和用户定义函数(UDF)技术,对不同垂荡板的受迫振荡进行了数值模拟。在不同幅值的简谐运动下,实心板、不同分形阶板(穿孔率分别为5%、12%和20%)和规则板(相同穿孔率为20%的孔的形状和排列方式不同)的流体动力特性%)进行比较和分析。垂直力的时间历程,获得了不同垂荡板的附加质量系数(Cm)和阻尼系数(Cd)。结果表明,在相同的振荡周期下,随着简谐运动幅值的增加,各垂荡板的Cd值逐渐减小,最终趋于稳定,而Cm值则不断增大。比较不同分形垂荡板时,Cm值随着分形阶数的增加而减小,而Cd值在相同条件下先增大后减小。此外,Cd 值在二阶达到最大值。随着孔周长变大,穿孔率为 20% 的规则孔随着 Keulegan-Carpenter 数 (KC) 的增加呈现出阻尼系数的线性增加。分形板的阻尼系数明显大于普通板的阻尼系数,
更新日期:2020-09-01
中文翻译:
基于浮动式风力机平台的分形垂荡板受迫振荡水动力特性
摘要 升沉板由于具有增加阻尼和增加质量的优点而被广泛应用于海洋工程领域。本文将分形理论应用于垂荡板的结构设计,提出了一种分形板。借助Fluent中的动态网格和用户定义函数(UDF)技术,对不同垂荡板的受迫振荡进行了数值模拟。在不同幅值的简谐运动下,实心板、不同分形阶板(穿孔率分别为5%、12%和20%)和规则板(相同穿孔率为20%的孔的形状和排列方式不同)的流体动力特性%)进行比较和分析。垂直力的时间历程,获得了不同垂荡板的附加质量系数(Cm)和阻尼系数(Cd)。结果表明,在相同的振荡周期下,随着简谐运动幅值的增加,各垂荡板的Cd值逐渐减小,最终趋于稳定,而Cm值则不断增大。比较不同分形垂荡板时,Cm值随着分形阶数的增加而减小,而Cd值在相同条件下先增大后减小。此外,Cd 值在二阶达到最大值。随着孔周长变大,穿孔率为 20% 的规则孔随着 Keulegan-Carpenter 数 (KC) 的增加呈现出阻尼系数的线性增加。分形板的阻尼系数明显大于普通板的阻尼系数,