Solid-structure impact pattern of a vortex-induced oscillating flexible pipeline in the vicinity of a bottom wall boundary

The vortex-induced vibration and solid-structure impact of a neutrally buoyant horizontal flexible pipe in the vicinity bottom wall boundary are experimentally investigated water flume. with an aspect ratio 87 is arranged oblique angle 30° initial gap-to-diameter 0.5. A non-intrusive measurement two high-speed cameras employed to simultaneously capture spatial-temporal displacements both inline crossflow directions, pipe-wall process reduced normal velocity range 3.40–14.43 maximum Reynolds number 2780. Experimental results highlight new equilibrium profiles deviating away from due proximity collision. occurrence wall-impact determined by whether amplitude larger or equal summation position gap. observed five distinct solid-pipe patterns as well location length impacting segments closely associated dominant response mode space-varying amplitude. Particularly, competition contributes spatial shift over time.