高海况下浮式生产装置减动结构尺度敏感性分析

Scale-sensitivity analysis for floating production system with anti-motion structure under high sea conditions

针对一种增加了延伸筒体与减动结构且延伸筒体与减动结构之间存在间隙的新型圆筒型浮式钻井生产储卸油装置(FDPSO),以1∶77.8的缩尺比建立缩尺模型,采用基于三维粘流理论的水动力计算软件STARCCM+对高海况条件下的新型圆筒型FDPSO垂荡运动进行数值模拟计算,分析减动结构宽度变化(10~15 m)和减动结构高度变化(10~15 m)对新型圆筒型FDPSO垂荡运动的影响。结果表明,增加减动结构宽度和高度,均使结构垂荡运动固有周期增大,使其远离波浪主能量周期范围,对FDPSO的垂荡运动有一定的抑制作用。对比不同尺寸结构周围涡量场分布随运动的变化,分析可知高宽度减动结构模型旋涡的产生与脱落相比低宽度减动结构模型有明显增加,高度变化引起的旋涡的产生与脱落相比于宽度变化并不明显。

The heave motion of a new cylindrical floating drilling production storage and offloading system(FDPSO)with extended cylinder,anti-motion structure and a gap between the extended cylinder and anti-motion structure under high sea conditions was investigated by implementing numerical simulations for its reduced-scale model(1:77.8)using the CFD software STAR-CCM+.The effect of changing the width(10~15 m)and height(10~15 m)of the anti-motion structure on the heave motion of the new cylindrical FDPSO were analyzed.The results show that increasing the width and height of the anti-motion structure increases the natural period of the structural heave motion,making it far away from the main energy period of the wave,and has a certain inhibitory effect on the heave motion of the FDPSO.Comparing the variation of vortex field around the structures of different sizes,it is concluded that the vortex generation and vortex shedding around the high-width anti-motion structure model is significantly strengthened compared with the low-width anti-motion structure model.The variation of the vortex generation and vortex shedding due to the change in height is relatively inferior compared to the change in width.