Sidewall effects on near-trapping of a four-cylinder structure

被引：0
作者：
Ji C. [1 ]
Du Y. [1 ]
Jiang S. [2 ]
机构：
[1] School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian
[2] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2021年 / 42卷 / 04期
关键词：
Boundary element method; Four-cylinder structure; Hydrostar; Near trapping; Potential flow; Sidewall effect; Wave run-up; Wave tank;
D O I：
10.11990/jheu.201912017
中图分类号：
学科分类号：
摘要：
To accurately predict the air gap performance of an offshore platform and improve the safety of the platform, the hydrodynamic characteristics of the structure in the open sea area and in the flume were investigated with the help of HydroStar. Based on the linear potential flow theory and the boundary element method, a comparative study of the near-trapping phenomena of the four-cylinder structure was carried out under wave action with cylinders of various radii. The results show that natural frequencies of the near-trapped mode move to a high frequency with an increase in the radius of the cylinder, and it has a significant impact on the higher-order near-trapped mode and causes the change in wave surface distribution characteristics; the spacing between the sidewalls of the cylinders is a key factor to determine the frequency of a near-trapping phenomenon; there are coupling effects between the frequencies of near-trapping and horizontal resonance, and they are excited at the same time, resulting in a significant increase in wave elevation near the corresponding frequency. Copyright ©2021 Journal of Harbin Engineering University.
引用
收藏
页码：482 / 490
页数：8
相关论文
共 13 条
  • [1] MANIAR H D, NEWMAN J N., Wave diffraction by a long array of cylinders, Journal of fluid mechanics, 339, pp. 309-330, (1997)
  • [2] PORTER R, EVANS D V., Rayleigh-Bloch surface waves along periodic gratings and their connection with trapped modes in waveguides, Journal of fluid mechanics, 386, pp. 233-258, (1999)
  • [3] OHL C O G, EATOCK TAYLOR R, TAYLOR P H, Et al., Water wave diffraction by a cylinder array. Part 1. Regular waves, Journal of fluid mechanics, 442, pp. 1-32, (2001)
  • [4] OHL C O G, TAYLOR P H, EATOCK TAYLOR R, Et al., Water wave diffraction by a cylinder array. Part 2. Irregular waves, Journal of fluid mechanics, 442, pp. 33-66, (2001)
  • [5] HONG S Y, KIM J H, CHO S K, Et al., Numerical and experimental study on hydrodynamic interaction of side-by-side moored multiple vessels, Ocean engineering, 32, 7, pp. 783-801, (2005)
  • [6] JIANG Shengchao, LV Lin, TENG Bin, Et al., Hydrodynamic analyses for near-trapping of a four-cylinder structure under water waves, Journal of Harbin Engineering University, 32, 5, pp. 546-554, (2011)
  • [7] CONG Peiwen, A novel complete second-order method for the motion response of floating bodies in the time-domain and an investigation on the nonlinear near-trapping phenomenon, (2015)
  • [8] ZHANG Zhigang, HE Guanghua, WANG Zhengke, Application of genetic algorithm in reduction of wave drift forces on the multiple floating bodies, Journal of Harbin Engineering University, 40, 2, pp. 240-246, (2019)
  • [9] URSELL F., Surface waves on deep water in the presence of a submerged circular cylinder. I, Mathematical proceedings of the Cambridge philosophical society, 46, 1, pp. 141-152, (1950)
  • [10] KASHIWAGI M., Radiation and diffraction forces acting on an offshore-structure model in a towing tank, International journal of offshore and polar engineering, 1, 2, (1991)
12