海洋深層水取水管の挙動に及ぼす管内流の影響

概要

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A time-domain numerical method to predict in-line dynamics of flexible risers for upwelling deep ocean water has been developed. The analysis method is based on a swing-by-swing technique with symmetrical vortices model. The effects of internal flow are considered by adding the momentum change of the internal flow, the frictional force on the inner wall of the pipe, the reduction of the internal pressure, and the reaction force of the intake flow. To validate the present dynamic analysis method, motion measurements in steady current conditions and forced oscillation conditions in still water are performed. The results in steady current conditions show that the horizontal displacement of the pipe with internal flow is larger than that without internal flow due to the reaction force of the intake flow. The results in forced oscillation conditions demonstrate that the amplitude of the motion increases when the internal flow exists.
社団法人日本船舶海洋工学会の論文
2000-09-25