钢悬链式立管涡激振动流固耦合非线性分析方法研究

摘要

With exploration of oil and gas in deep sea,steel catenary risers (SCRs)become the preferred riser systems for oil and gas import and export.Vortex induced vibration (VIV)is the key problem in design of SCRs.Here, SCRs were modeled into slender beams with large deflection and bending stiffness.The two-way VIV model with fluid-structure interaction was proposed,the VIV behavior of SCRs,especially,that at touch down points (TDP)was then studied based on the improved model.The cases studies showed that the model can be used to simulate the VIV of SCRs pretty well and to analyze the VIV of deepwater risers in uniform flow field;The VIV response of SCRs at TDP is larger and complex,it should be taken as a key point for the VIV study of SCRs.%随着油气资源勘探和开发活动不断向深海发展，钢悬链式立管（SCRs）成为深海浮式生产系统油气输送的首选立管，涡激振动是钢悬链式立管设计的核心问题。运用柔性索理论，采用具有弯曲刚度的大挠度细长梁模型模拟SCR，并根据提出的钢悬链式立管非锁定区考虑流固耦合的两向涡激振动模型，研究立管尤其是触地点处的涡激振动特性，算例表明，考虑流固耦合的两向涡激振动模型能够较好的模拟钢悬链式立管的涡激振动，可进行均匀流场中涡激振动的研究分析；钢悬链式立管触地点处的涡激振动响应较大且复杂，应作为SCR涡激振动研究的关键点。