基于CFD的半潜式钻井服务支持平台拖航阻力数值分析

通过分离涡模拟法（detached eddy simulation，DES）对半潜式钻井服务支持平台拖航阻力进行了研究，重点对平台拖航阻力、阻力系数和平台表面附近流场分布等特性进行了研究。研究表明：流方向下平台各结构所受阻力各不相同，下浮体占据总阻力比最大（尤其是90°来流方向下）。阻力系数及升力系数时历曲线变化具有“脉动性”。通过平台表面附近流场分布可以分析涡形成及受力原因，逆方向流及涡之间相互作用使得阻力有所减小。

Numerical analysis for the towage resistance of semi-submersible tender support vessel based on the CFD method

Detached eddy simulation （DES）is applied to research on drag force of semi-submersible tender sup-port vessel.The drag force,drag coefficient,lift coefficient and flow field on surface of the platform are studied in this paper.It is demonstrated that drag force on every structure of the platform varies with the incidence angle of current.Drag force on pontoon accounts for the largest proportion of that on the platform,especially at inci-dence angle of 90.The“beating”behavior appears in the time history of drag coefficient and lift coefficient.The reason of vortex formation and force on surface of platform is discussed in terms of the flow field near the platform surface.Counter current and interaction between vortices can reduce drag force of the platform.