摘要
张力腿平台的支撑结构由四根直立圆柱构成,四根支撑圆柱周围波面高度的计算对张力腿平台结构安全以及气隙设计具有重要意义。采用模型试验的方法对四柱结构的波浪绕射问题进行研究。试验中对柱体附近多个位置处的波面高度进行测量,通过对测量数据的统计分析,得到一阶和二阶水面波高分量幅值。为了验证绕射理论在计算波面高度上的适用性,试验结果与数值模拟结果进行了对比。通过对比发现,即使波陡较大的情况下二阶绕射理论也可以很好地对波面高度进行模拟。同时,对发生在多柱结构内部的重要近场干涉现象也进行了观测。在特定的入射频率下,试验中观测到四柱结构内部流体发生明显的共振运动。
The deck of tension leg platform is supported by four vertical columns and the prediction of the free surface elevation in the vicinity of the four supporting columns is significantly important for the structure safety and air gap design. An experiment is carried out to study the diffraction of regular waves by a four-cylinder structure. The experiments are designed to measure free surface elevation at multiple locations close to cylinder surface. By analysis of measured data, amplitudes of the first-order and second-order quantities are obtained. To examine the validation of the diffraction theory in predicting the free surface elevation, comparison is carried out between the experimenta and numerical results. Even for high steepness, the second-order diffraction theory is shown to be effective to free surface elevation. Furthermore, the important phenomenon near trapping is investigated in the experiment. For specific incident wave frequency, obvious resonant wave motion can be observed inside the structure.
出处
《海洋工程》
CSCD
北大核心
2014年第2期13-23,78,共12页
The Ocean Engineering
基金
国家自然科学基金资助项目(51379032
51221961)
国家重点基础研究发展(973)计划资助项目(2011CB013703)
关键词
四柱结构
波面高度
二阶绕射
近场干涉
海洋平台
four-cylinder structure
wave elevation
second-order diffraction
near-trapping
