Dynamic analysis of deepwater risers conveying two-phase flow under vortex-induced vibration

2021 ◽  
Vol 43 (4) ◽  
Author(s):  
Jijun Gu ◽  
Tianqi Ma ◽  
Leilei Chen ◽  
Jichuan Jia ◽  
Kai Kang
Keyword(s):  
Dynamic Analysis ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Vortex Induced Vibration ◽  
Deepwater Risers

scholarly journals Nonlinear vortex-induced vibration dynamics of a flexible pipe conveying two-phase flow

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988192
Author(s):  
Wenwu Yang ◽  
Xueping Chang ◽  
Ruyi Gou
Keyword(s):  
Natural Frequencies ◽  
Two Phase Flow ◽  
Volume Fraction ◽  
Phase Flow ◽  
Flexible Riser ◽  
Two Phase ◽  
Frequency Spectra ◽  
Vortex Induced Vibration ◽  
Vibration Prediction ◽  
Synchronization Region

In this article, a vortex-induced vibration prediction model of a flexible riser conveying two-phase flow, including geometric and hydrodynamic nonlinearity, is established. A van der Pol wake oscillator is utilized to characterize the fluctuating lift forces. The finite element method is chosen to solve the coupled nonlinear fluid–structure interaction equations. The natural frequencies of the flexible riser are calculated to validate the method through comparisons with results from the literature. The modal analyses show that geometric nonlinearity has a significant effect on the natural frequency, and the critical internal velocity is reduced than those in linear analyses. The impacts of the gas volume fraction as functions of cross-flow velocity on the synchronization region, the displacement amplitudes, and the maximum stresses and frequency spectra have been investigated. The results show that an increase in the gas fraction results in the linear increase in natural frequencies and a wider synchronization region, and an increase in liquid flow rate led to the slight decrease in displacement amplitude and maximum stress within a small flow range.

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