半潜式采油平台波浪漂移力分析研究

Wave drift forces of Semi-Submersible

对于半潜式采油平台而言,波浪漂移力是设计其锚泊系统的重要依据,文章依据波浪辐射和绕射理论,采用高阶边界元方法并考虑了半潜式采油平台几何形状的对称性,应用近场解法得到半潜平台6个方向的波浪漂流力。研究中还采用了在半潜平台直角边和角点处布置双重和多重节点的方法,该方法极大地提高了波浪漂移力的计算准确性和数值稳定性,特别是在高频波浪区域。

In the hydrodynamic study of Semi-Submersible, wave drift forces are important for the design-ing of mooring system. Based on wave radiation and diffraction theory, a higher-order boundary element method （HOBEM） is applied and symmetry is considered to calculate the wave drift forces of Semi-Sub-mersible under definite wave directions and frequencies. The mean wave drift forces and moments on Se-mi-Submersible are computed by near-field method. Double and multiple nodes relocation method is intro-duced in higher order boundary element method to remove geometrical singularity along intersecting edges and corners. This algorithm significantly improves the accuracy and numerical stability of mean drift force even in high frequency domain.