半潜钻井平台辐射问题的高精度算法研究

An efficient algorithm to study radiation problem of ISSC type Semi-Submersible

附加质量和阻尼力是决定半潜式钻井平台运动响应的重要参数,该研究采用直交边界边配置多重节点的新方法去除积分边界的奇异性。研究中同时应用了高阶边界单元方法近似真实的空间三维复杂结构,依据波浪与结构物相互作用的辐射和绕射理论建立边界元积分方程,对ISSC型半潜式平台(Semi-Submersible)的附加质量和阻尼力进行了分析研究。研究表明多重节点与高阶边界元相结合的方法对复杂结构的水动力计算具有很高的精度。

Added mass and damping are critical for hydrodynamic response of Semi-Submersible. This paper employs a new double or multiple nodes relocation method on sharp edges to remove geometrical singularity. High order boundary element method is utilized to approximate real three dimensional complicated structure, the added mass and damping of ISSC Semi-Submersible are investigated based on linear wave radiation and diffraction theory. It is found that the new algorithm combing multiple node relocation method and high order boundary element method is efficient for hydrodynamic problem of complicated structure.