Effect of wake interference on vibration response of dual tandem flexible pipe

• Published in: Ocean engineering Vol. 269; p. 113497
• Main Authors: Chen, Zheng-Shou, Wang, Shuai, Jiang, Xue
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2023
• Subjects: Axis spacing; Dual tandem pipe; Multi-mode; VIV; Wake interference; VIV; Dual tandem pipe; Axis spacing; Wake interference; Multi-mode
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2022.113497

Vortex-induced vibration (VIV) related to multi-pipes, dual tandem pipe in especial, attracts much attention in ocean engineering. Based on a CFD method, the effect of wake interference on the vibration response and spanwise waveforms related to dual large-scale flexible pipe in tandem subject to shear flow at low Reynolds number (Re) was investigated. Through the transient analysis of vibration energy, the features of “in-phase” and “anti-phase” are found in both up- and downstream vibration processes. A 3D position-frequency-energy (PFE) illustration method was introduced, aiming at vividly demonstrating the participant vibration modes and the corresponding vibration energy. Based on the analysis via the proposed PFE method, it is found that the interference in relation to the up- and downstream pipes leads to the emergence of multi-mode phenomena and the prominent standing waveforms along pipe span in the case of different axis spacings. The multi-mode or even multiple-dominant-mode is prone to occur in dual tandem pipe system, and the vibration modes induced along the downstream pipe are usually lower than those of the upstream pipe. The spanwise waveform easily converts from standing-wave-dominated status to a hybrid standing-traveling wave status when the shear flow velocity is higher. In addition, the vorticity contours are also provided, helpful to find out the correlation between vibration response and wake patterns. •The effect of wake interference on the vibration response and spanwise waveforms related to dual large-scale flexible pipe in tandem subject to shear flow was investigated.•A 3D position-frequency-energy (PFE) illustration method was introduced.•The features of “in-phase” and “anti-phase” are found in both up- and downstream vibration processes.•The interference of dual tandem pipe leads to the multi-mode phenomena and the prominent standing waveforms along pipe span.•The spanwise waveform easily converts from standing-wave-dominated status to a hybrid standing-traveling wave status.