中文摘要：

以半潜式钻井服务支持平台BT-3500 TSV原型为研究对象,基于降阻提稳理念对平台上层建筑结构形式及布局提出了3种优化方案。基于Fluent软件结合自编UDF程序并考虑NPD风谱的影响,利用简谐波叠加法将风谱由频域转换为时域内的随机脉动风速,引入雷诺平均法求解N-S方程,结合分离涡（DES）湍流模型对半潜式钻井服务支持平台BT-3500 TSV在自存海况下原型和3种优化方案的风力和风倾力矩进行数值计算和对比分析。研究结果表明：平台在0°~120°风向内风力与风倾力矩呈类似正弦函数变化,最大值出现在60°与120°附近;优化方案1在15°以后的风向区域,风力与风倾力矩较原方案减小明显,尤其在90°风向较原方案减小了30%;方案2在50°以后的风向区域优化效果与方案1基本一致;由于受风面积在风力中占主体地位,方案3优化效果较差。

英文摘要：

For the prototype of the semi-submersible tender support platform BT-3500 TSV, three optimal schemes of structural form and layout of the superstructure are put forward. Based on Fluent and self-compiled UDF, the pulsating wind spectrum in frequency domain is converted into random fluctuating wind in time domain, and then wind forces and wind moments are numerically simulated by using Reynold＇s average N-S equation and DES numerical model. Numerical simulation results show that the variation of wind force and wind moment acted on the BT-3500 prototype for wind direction within the range of 0-120 degrees are similar to the sine function. The wind force and wind moment of the optimal scheme No. 1 sharply decreased as the wind direction above 15 degrees, and it will have a 30% of reduction at 90 degrees of wind direction. The optimal scheme No. 2 is consistent with the optimal scheme No. 1 after the wind direction of 50 degrees. The optimal scheme No.3 is unsatisfied, because the wind area holds a great portion in evaluating wind load.