Email Alerts
RSS
Numerical simulations of the group effect of large-diameter columns in regular waves
-
摘要: 多桩柱结构在海洋工程中应用广泛，大直径群桩效应使得桩柱所受到的波浪力与单桩大为不同。首先使用基于势流理论开发的三维水动力分析程序DIFFRACT计算了单个圆柱和双圆柱所受到的波浪力，通过与相应解析解的对比验证了数值结果的准确性。进一步分析了大尺度多桩柱结构在规则波中所受的波浪力。群桩间的水动力相互作用使桩群中每个圆柱所受的波浪力存在多个峰值，其最大值可达单个圆柱所受波浪力的2.30倍，并且最大波浪力圆柱的位置受桩群布置的影响。Abstract: Structures with multiple columns are widely used in ocean engineering, and wave loads on large-diameter columns in a group are quite different from the isolated ones. In the present study, a three dimensional hydrodynamic code DIFFRACT based on potential flow theory is used to calculate wave loads on a single circular cylinder and twin circular cylinders. The accuracies of numerical results are verified by comparing with the corresponding analytical solutions. The wave loads on multiple circular columns in regular waves have been further investigated. Multiple peaks have been found in the results due to the hydrodynamic interactions between columns, which can reach 2.30 times of wave loads on isolated column. The locations of columns with maximum loads are affected by the layout of the group.
-
Key words:
- group effect /
- regular wave /
- large-diameter circular column /
- wave loads
-
图 6 4圆柱结构受到的波浪力及群效应系数
Figure 6. Wave loads on four columns and coefficients of group effect
图 7 5圆柱结构受到的波浪力及群效应系数
Figure 7. Wave loads on five columns and coefficients of group effect
图 8 6圆柱结构受到的波浪力及群效应系数
Figure 8. Wave loads on six columns and coefficients of group effect
-
[1] CHAKRABARTI S K. Transverse forces on vertical tube array in waves[J]. Journal of the Waterway, Port, Coastal and Ocean Division, 1982, 108(1): 1-15. [2] 高明道, 韩丽华, 孙绍述. 规则波作用下群桩波浪力的实验研究[J]. 大连工学院学报,1987,26(1):137-140. (GAO Mingdao, HAN Lihua, SUN Shaoshu. Experimental research for wave force of group piles under the action of regular waves[J]. Journal of Dalian Institute of Technology, 1987, 26(1): 137-140. (in Chinese) [3] 杨正己, 左其华, 苏伟东. 作用于群桩上的波浪力[J]. 水利水运科学研究,1992(3):231-243. (YANG Zhengji, ZUO Qihua, SU Weidong. Wave forces on multiple piles[J]. Journal of Nanjing Hydraulic and Research Institute, 1992(3): 231-243. (in Chinese) [4] 俞聿修, 张宁川. 双桩桩列上的不规则波浪力[J]. 大连工学院学报,1988,27(1):103-112. (YU Yuxiu, ZHANG Ningchuan. Irregular wave forces on array of bi-pile[J]. Journal of Dalian Institute of Technology, 1988, 27(1): 103-112. (in Chinese) [5] 黄雯, 冯谊武, 张海龙. 波浪作用下的群桩受力及优化布置[J]. 桥梁建设,2016,46(3):51-56. (HUANG Wen, FENG Yiwu, ZHANG Hailong. Mechanical properties and optimal arrangement of group piles acted by wave forces[J]. Bridge Construction, 2016, 46(3): 51-56. (in Chinese) [6] DE PALMA P, DE TULLIO M D, PASCAZIO G, et al. An immersed-boundary method for compressible viscous flows[J]. Computers & Fluids, 2006, 35(7): 693-702. [7] ZHANG N, ZHENG Z C. An improved direct-forcing immersed-boundary method for finite difference applications[J]. Journal of Computational Physics, 2007, 221(1): 250-268. doi: 10.1016/j.jcp.2006.06.012 [8] 李玉成, 刘德良, 陈兵, 等. 大尺度圆柱墩群周围的波流场的数值模拟[J]. 海洋通报,2005,24(2):1-12. (LI Yucheng, LIU Deliang, CHEN Bing, et al. Interaction of waves with vertical large-scale cylinders in a current[J]. Marine Science Bulletin, 2005, 24(2): 1-12. (in Chinese) doi: 10.3969/j.issn.1001-6392.2005.02.001 [9] 武昕竹, 柳淑学, 李金宣. 聚焦波浪与直立圆柱作用的数值模拟[J]. 水利水运工程学报,2015(6):31-39. (WU Xinzhu, LIU Shuxue, LI Jinxuan. Numerical simulation of interactions of focusing wave with a vertical cylinder[J]. Hydro-Science and Engineering, 2015(6): 31-39. (in Chinese) [10] 乔永亮, 桂洪斌, 刘祥鑫. 三维圆柱绕流数值模拟湍流方法的选择[J]. 水利水运工程学报,2016(3):119-125. (QIAO Yongliang, GUI Hongbin, LIU Xiangxin. Analysis of three-dimensional numerical simulation methods for turbulent flow past circular cylinder[J]. Hydro-Science and Engineering, 2016(3): 119-125. (in Chinese) [11] SUN L, CHEN L F, ZANG J. Hydrodynamic analysis of interactions between waves and offshore structures[C]//Proceedings of the 11th Pacific/Asia Offshore Mechanics Symposium (PACOMS 2014). Shanghai: The International Society of Offshore and Polar Engineers, 2014: 261-266. [12] SUN L, EATOCK TAYLOR R, TAYLOR P H. Wave driven free surface motion in the gap between a tanker and an FLNG barge[J]. Applied Ocean Research, 2015, 51: 331-349. doi: 10.1016/j.apor.2015.01.011 [13] EATOCK TAYLOR R, HUNG S M. Second order diffraction forces on a vertical cylinder in regular waves[J]. Applied Ocean Research, 1987, 9(1): 19-30. doi: 10.1016/0141-1187(87)90028-9 [14] GHALAYINI S A, WILLIAMS A N. Nonlinear wave forces on vertical cylinder arrays[J]. Journal of Fluids and Structures, 1991, 5(1): 1-32. doi: 10.1016/0889-9746(91)80009-3 [15] CONG P W, GOU Y, TENG B, et al. Model experiments on wave elevation around a four-cylinder structure[J]. Ocean Engineering, 2015, 96: 40-55. doi: 10.1016/j.oceaneng.2014.11.031 -
下载:
点击查看大图
图(9)
计量
- 文章访问数: 545
- HTML全文浏览量: 244
- PDF下载量: 34
- 被引次数: 0
