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Vortex-induced vibration (VIV) is one of the main factors leading to fatigue damage of marine risers, and the endeavor to suppress vibration is one of the important contents in the design of cylindrical ocean structures. In this paper, based on a two-way fluid-structure interaction simulation method, the VIV response characteristics related to airfoil pipe, textured pipe and smooth pipe were investigated, taking into account the function of VIV passive suppression attributed to special-shaped surfaces such as spoilers and surface textures. The simulation results show that both the spoiler and the textured shapes can effectively reduce the vibration response, shortening the vibration lock-in range. By affecting the vortex shedding modes and reducing the fluid force coefficients, the special-shaped surfaces covered onto the flexible pipes play a significant role in suppressing VIV, especially under conditions with higher reduced velocities. This research work provides a reference for the design of marine risers covered by special-shaped surfaces, such as airfoil pipes and textured pipes, aiming at passive vibration suppression.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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