输运流体海洋立管的动力特性

Dynamic Characteristics of Marine Risers Conveying Fluid

从流体的动量方程出发,考虑流体和管道的耦合,推导出输运流体海洋立管的偏微分运动方程。用Hermite插值函数和Galerkin法离散运动方程建立海洋立管动力运动的有限元模型。然后,利用该模型研究管内气柱流对固有频率的影响。计算结果表明:立管内出现气柱流时,固有频率随气柱位置的不同而明显变化。

Based on the flow moment equation, developed the lateral motion equation of a marine riser by considering the coupling of the fluid and the pipe. By using the Hennite interpolation, the Galerkin method was adopted to discretize the motion equation. Then, the model was used to investigate the effects of air column flow on the natural frequency of the riser. The results show that when an air column flow occurs, the natural frequency of the riser changes with the movement of the air column.