海底悬跨管道在内流影响下的动力响应研究

The Dynamic Response of Free Span Submarine Pipeline Containing Flowing Fluid

海底管道是海洋油气工程的重要组成部分。如何保障海底管道的安全是设计和研究人员十分关心的问题之一。本文结合工程实际情况，应用有限元数值模型的耦合计算探讨了内流对海底悬跨管道动力响应的影响。针对水平输油悬跨管道，采用三维弹性动力学方程模拟管道，内部流体采用层流模型。通过在流固边界上反复迭代，进行管道及其内部流体系统的三维流固全耦合计算，得到管流耦合系统的固有频率，并与其它频率计算方法的计算结果进行了比较。同时对冲击载荷和波浪载荷作用下，不同流速内流对海底管道动力响应的影响进行了计算和比较分析。

Submarine pipeline is very important for the ocean oil and gas engineering. How to ensure the safety of submarine pipeline is one of the subjects concerned by engineers and researchers. The paper is to research the effect of internal flow on the dynamic response of free span submarine pipeline relating with engineering practice, coupling of the mathematical models of internal flow and pipeline. To horizontal submarine pipeline carrying oil, the 3-D fluid-structure interaction of pipeline and internal flow is numerically simulated by applying the iterative computation to the fluid-structure interfaces. The pipeline and internal flow are simulated by using the 3-D elastodynamic equation and laminar or turbulent model, respectively. The finite element method is used to discrete the governing equations. The natural frequency of this system is calculated, and compared with other methods for calculating the natural frequency of pipeline containing fluid. The computations are also performed for the pipe subjected to impact load or regular wave load with the different internal flow velocity, and the effect of internal flow on the pipeline dynamic response is discussed.