Internal flow effect in IL-CF coupled VIV of deep-sea risers

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (19) : 7-13.

ZHAO Guixin1, MENG Shuai1, CHE Chidong1, ZHAO Chuangye2, ZHANG Wenlong2

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Abstract

With the great increase of aspect ratio, the flexibility of a deep-water marine riser is enhanced and IFE (Internal Flow Effect) becomes remarkable inevitably. However, the IFE on the coupled IL (In-line) and CF (Cross-Flow) VIV (Vortex-Induced Vibration) of deep-water marine risers has not been well understood. The dynamic motion equations of a flexible riser subject to an incoming current is established, in which a semi-empirical VIV hydrodynamic model is employed. The VIV responses of a flexible riser at different internal flow velocities, internal flow densities and current velocities are examined. It has demonstrated that (1) the internal flow induced centrifugal force can decrease the natural frequencies. With the increase of internal flow velocity, the CF/IL dominant excitation frequency can leave the excitation region. Then the CF/IL dominant mode transfers to a higher order companied by a jump increase of the dominant frequency. (2) Whether the maximum value of the CF RMS displacement is increased or decreased depends on whether the CF dominant frequency approaches or departs from the vortex shedding frequency; (3) The centrifugal force can decrease the system stiffness and the IL static deformation increases with the increase of internal flow velocity. Once the CF dominant mode switch occurs, the static deformation has a jump decrease ascribed to the sudden reduction of the drag coefficient. (4) The IFE has a non-negligible effect on the IL dynamic response, which is affected by the resultant effects of the internal flow, the drag force (depending on the CF VIV response) and IL vortex shedding force.

Key words

IFE / CF VIVs / dominant mode translate / IL static deformation / IL vibration response

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ZHAO Guixin1, MENG Shuai1, CHE Chidong1, ZHAO Chuangye2, ZHANG Wenlong2. Internal flow effect in IL-CF coupled VIV of deep-sea risers[J]. Journal of Vibration and Shock, 2023, 42(19): 7-13

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