Vortex-induced vibration response characteristics and Coriolis force effect of&nbsp; riser with internal flow under different flow fields

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 165-173.

Vortex-induced vibration response characteristics and Coriolis force effect of riser with internal flow under different flow fields

LI Xinghui1,2, YUAN Yuchao1,2, XUE Hongxiang1,2, TANG Wenyong1,2

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Abstract

Vortex-induced vibration (VIV) occurs in slender structures under the action of ocean currents, which is one of the main causes of fatigue damage of marine risers. The riser is filled with oil and gas during operation, and the internal flow will generate inertial force, Coriolis force and centrifugal force, which makes the dynamic response of the riser more complicated. Based on a time-domain prediction model of VIV response of the riser with internal flow, VIV response of the riser with internal flow under uniform and shear currents are calculated. The Coriolis force with complicated mechanism is analyzed. Internal flow reduces natural frequencies and increases VIV amplitude of the riser under uniform current, and it triggers higher modal order response under shear current. Under uniform current, Coriolis force does positive or negative work in a certain area, causing the root-mean-square (RMS) displacement to increase or decrease respectively. Under shear current, Coriolis force increases the RMS displacement in the top area of the riser, and decreases the RMS displacement in the middle area. The larger the internal flow velocity is, the more significant the Coriolis force effect is.

Key words

internal flow / Vortex-induced vibration / top-tensioned risers / Coriolis force / time domain model

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LI Xinghui1,2, YUAN Yuchao1,2, XUE Hongxiang1,2, TANG Wenyong1,2. Vortex-induced vibration response characteristics and Coriolis force effect of riser with internal flow under different flow fields[J]. Journal of Vibration and Shock, 2023, 42(3): 165-173

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