工作水深对浮式平台波浪砰击影响的敏感性分析

运用风洞和水池试验结果修正后的数值模型,同时考虑平台承受的风、浪、流环境载荷,及全尺度锚泊系统,以一典型半潜式平台为例,利用ANSYS-AQWA软件对半潜式平台波浪砰击次数和砰击载荷进行了非线性数值分析.在300、400和500m工作水深,45°、90°和180°3个载荷方向上建立9个工况,以及每个工况下的10个子工况,利用挪威船级社规范,研究了工作水深对平台的波浪砰击次数和砰击载荷影响的敏感性.针对各工况中的10个子工况结果,以90%的Gumble分布值作为最终的平台气隙的结果.通过数值模拟研究表明:相同的环境载荷、锚链类型和预紧力的情况下,平台的工作水深对平台气隙和波浪砰击的影响非常敏感.因此,在平台设计过程中应充分考虑工作水深对平台气隙和波浪砰击的影响.

Sensitivity Study of Wave Slamming with Respect to#br# Water Depth for Floating Platform

According to a typical example of semi submersible platform, the air gap of platform has been studied through the numerical model tuned and validated by the tank and wind tunnel test results with ANSYS AQWA. The wind, wave and current loads are simulated simultaneously. Meanwhile, the effect of the full scale mooring system has been simulated. In the 300, 400 and 500m water depth, the sensitivity of wave slamming with respect to water depth has been studied based on the Det Norske Veritas (DNV) specification in 45°, 90° and 180° load directions through 9 cases and their 90 sub cases. The 90% Gumble distributions for the 10 sub cases of each case are chosen as the final results of the air gap. It is found that the results are obviously sensitive for the air gap and wave slamming through the same environment condition, mooring line type and pretension. Therefore, the water depth should be considered for the analysis of air gap and wave slamming in the design progress for engineering project.