A time-domain numerical method for predicting in-line dynamics of flexible deep seawater risers with internal flow is 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 the motion increases when the internal flow exists.
Effects of internal flow on dynamics of deep seawater risers
1999
6 Seiten, 11 Quellen
Conference paper
English
Mathematics of flexible risers including pressure and internal flow effects
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