规则波对大直径群桩作用的数值模拟研究

Numerical simulations of the group effect of large-diameter columns in regular waves

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。

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.