三角分布的海洋立管涡激振动数值分析

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Abstract Numerical simulation for vortex-induced vibration (VIV) of marine risers with triangular distribution was performed using XFlow solver based on the lattice Boltzmann particle grid technique. Transverse single-DOF VIV of a 2-D cylinder was described using the second order van der Pol equation, and effects of 3 cylinders’ spacing ratio and incoming flow reduction speed on VIV features of cylinders were studied. The cylinders’ spacing ratio L/D = 0.5, 2.0 and 4.0, and the incoming flow reduction speed Ur = 1-9. VIV amplitude of cylinders, features of lift-drag coefficient and vortex shedding mode in wake of cylinders were analyzed. The results showed that when cylinder spacing ratio L/D = 0.5, 2.0, and 4.0, upstream cylinder VIV’s locking vibration interval Ur = 3.5-7.0, 3.5-7.5 and 3.5-6.0, respectively, the maximum amplitude Yrms/D = 0.372, 0.546 and 0.470, respectively; when cylinder spacing ratio is too big or too small, fluid flow mode is affected by proximity effect and wake effect, respectively; with medium spacing ratio, within a non-locking vibration interval, fluid flow mode is affected by combination of above two effects; within a locking vibration interval, fluid flow mode is mainly affected by wake effect; change of fluid interference effect significantly affects change of cylinder lift-drag coefficient; with different spacing ratios, change trends of cylinder lift-drag coefficient are similar.
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Key words： marine riser vortex-induced vibration fluid-structure coupling triangular distribution

Received: 09 May 2018 Published: 28 September 2019

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I19/123

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