Flow-Induced Vibration of a Reversed U-Shaped Jumper Conveying Oil-Gas Two-Phase Flow

Subsea jumpers connecting the underwater wellhead and nearby manifold commonly undergo flow-induced vibration (FIV) due to spatially frequent alteration in flow direction, velocity, pressure phase volume fraction of oil–gas two-phase flow, potentially leading fatigue damage. This paper reports numerical results FIV a reversed U-shaped jumper excited by gas–liquid which evolves from initial slug with fixed ratio 1:2 when transporting through jumper. The response pattern evolution are examined gas rate Qg = 4–12 kg/s liquid QL 96–288 kg/s. When passes jumper, regime subsequently presents bubble churn imperfect annular flow. out-of-plane frequency coincides fluctuation for four bends, suggesting fluid–structure interaction (FSI). Nevertheless, displacement is limited maximum value less than 0.0014D (where D diameter) present considered range.