波流耦合作用下海洋柔性立管防弯器动力响应数值分析

摘要

基于三维动态时域分析软件OrcaFlex建立防弯器与立管耦合响应模型，对柔性立管防弯器在波流耦合作用下的动力响应进行了参数敏感性分析，结合分析结果对柔性立管防弯器系统进行优化布局，并分析了流向变化和浪向变化对弯矩的影响。结果表明，靠近立管与浮体或水下设备固结点的曲率和弯矩大，随着远离固结点，曲率和弯矩呈递减趋势。海流方向变化对立管和防弯器曲率和弯矩的影响较浪向变化更大。底部立管和防弯器弯矩高于顶部，需格外注意。防弯器曲率与立管曲率基本一致，但弯矩高出很多，达到了防弯器保护立管承载过度屈曲的目的。%In this paper, the model of response of bending stiffener coupled with riser was built based on Or⁃caFlex, a three⁃dimensional dynamic time domain analysis software. Considering the coupled response of waves and currents, parameter sensitive analysis was made for dynamic response of the system of riser and bend stiffener. Be⁃sides, based on the above analysis results, layout of the system of the riser and bend stiffener was optimized, and the effect of the variety of wave direction and current direction on bend moment was analyzed. Simulation results indi⁃cate that the curvature and bend moment are larger on section closed to joints than on others, and will decrease along the direction which is apart from joints. The effect of the variety of current direction on curvature and bend moment of riser and bending stiffener is larger than that of wave direction. Curvature and bend moment downside is larger than that of upside. Bend stiffener is almost the same with riser on curvature, but larger on bend moment, which achieves the goal of protecting riser from excessive bending for load bearing.