Mode switching and standing-travelling waves in slug flow-induced vibration of catenary riser

Experimental Measurement of Large-Amplitude Intermittent Vibrations of an Inclined Bendable Riser Transporting Unsteady Multiphase Flows

“…More recently, a mode switching phenomenon, accompanied by a modal transition from a standing wave to a travelling wave response in SIV of a catenary riser, has been experimentally observed in Zhu et al [31]. This mode switching occurs due to a variation of the slug liquid length and frequency.…”

“…However, the present study focuses on the relatively higher uls in a wider RGL range, resulting in different SIV responses and slug flow features. More recently, Zhu et al [31] have carried our SIV tests of a catenary riser for a single uls = 0.508 m/s and 1 ≤ RGL ≤ 4.5. Nevertheless, their slug initiation condition without a downward flow riser part is different from the present setup.…”

“…The maximum response was found to reach up to 15 times the external diameter. Along the same line of studies of Zhu et al [29,31], new experimental tests are carried out to provide additional experimental data, discussion on results and insights into the dynamic behaviours of catenary riser transporting unstable slug flows with varying RGL. This paper is structured as follows.…”

Experimental investigation on vortex-induced vibration and solid-structure impact of a near-bottom horizontal flexible pipeline in oblique shear flow

“…17, a travelling wave pattern is evident in the in-line direction due to the co-existence of multiple frequencies and modes. A temporal evolution of response amplitudes reflects a switching and sharing between the fourth and second modes due to the observed 2:1 resonance (Zhu et al, 2021a(Zhu et al, , 2021b.…”

Numerical Modeling of Coupled Surge‐Heave Sloshing in a Rectangular Tank with Baffles

“…If the excitation frequency is close to the system's natural frequencies, and the excitation amplitude is reasonably large, the sloshing wave is prone to break; those analytical solutions can be completely invalid [12][13][14][15]. e numerical methods become popular as they are effective supplements to realize the nonlinear phenomenon.…”