低雷诺数下海底悬空子母管线绕流特性研究

The disturbance characteristics research of suspension submarine pipeline in low reynolds number

对海底管线在低雷诺数下绕流进行了数值模拟,分析了子母管线发生破坏的形式及机理,为工程中子母管线的设计提供参考。通过研究发现,当子母管间不存在间隙时,子母管线后形成的漩涡比单一管线后漩涡大,并且漩涡的脱落周期较长。当子母管间存在较小间隙时,子母管后方依然会有漩涡周期性的脱落,但是,管线的受力出现了周期性的不规则变化。当子母管线后方发生漩涡脱落时,母管的受力比子管大,而子管的受力频率却比母管大。

The disturbance characteristics of submarine pipeline at low Reynolds number is conducted in this study.It is found that when there is no gap between the main pipe and small pipe,the vortices formed behind piggyback pipelines are much larger than that of single-pipelines,and the shedding period of the former is longer.When the gap between the piggyback pipelines is much little,vortices are still shed periodically behind the piggyback pipeline,while it appears that the periodic irregular variation of the force on pipeline.When the piggyback pipelines vibrate,the vibration amplitude of the force on main pipe is larger than that on the small pipe,while the vibration frequency of the force on main pipe is lower.