基于数值模拟的半潜式钻井平台附加质量研究

Research on the added mass of semi-submersible drilling platform based on numerical simulation

为了较为完整地明确计算钻井平台影响附加质量的因素,以及附加质量之间的关系,文章主要基于数值模拟计算的方法,通过水动力分析软件AQWA求解平台36个附加质量分量,通过与数学模型计算对比分析得到相应的结果。从AQWA分析得到的视图中可知,平台的附加质量分量随波浪频率的变化而变化;在横荡方向的附加质量由小到大依次为型一、型二、型三平台,与平台在xoz平面内的面积投影大小关系对应,而纵荡方向附加质量基本与平台在yoz平面内的面积投影大小关系对应;通过公式计算的附加质量分量与数值模拟的独立附加质量分量数高度一致。得到平台的附加质量大小与波浪的频率有关;平台在坐标平面上的投影面积大小能在一定程度上反应出附加质量的大小;36个附加质量分量中有21个是独立的。

In order to more complete know about impact factors clearly and the relationship among added mass components on the drilling platform, based on the numerical simulation method, using the software AQWA calculated 36 added mass components, and the corresponding results were calculated and compared with the mathematical model. AQWA analysis view shows that the platform added mass component changes with wave frequency; the types 1, 2 and 3 platform added mass of sway direction are successively increasing, which corresponding platform area projection in plane xoz, while the surge direction of added mass value is connected with platform area projection in plane yoz; independent added mass component numbers calculated by the formula and numerical simulation are highly consistent. The relationship between the size of added mass of platform and the wave frequency is obtained; platform on the coordinate plane projection area size can reflect the size of the added mass in a certain extent; 36 added mass components have 21 are independent.