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Deep draft cylindrical floating nuclear platforms are a new type of multi-functional and efficient platforms, which can effectively solve the problem of energy supply in the development of offshore islands and reefs in the South China Sea. At a certain inflow velocity, the wake area will induce vortex-induced motions (VIMs) of a platform, which will seriously accelerate the fatigue damage of the mooring and riser system, and adversely affect the operation of nuclear reactors inside the platform. Based on the improved delayed detached eddy simulation (IDDES), the sway, surge and yaw motion responses of a platform at different reduced speeds were numerically simulated, and the key characteristics of vortex-induced motions were analyzed from the perspectives of motion trajectory, motion frequency and three-dimensional flow field. The results show that when the reduction speed of Ur ranges between 5.45 and 9.08, the amplitude of sway and yaw increases gradually, the motion trajectory is similar to a“banana”, the frequency of sway and yaw is basically the same, and there is no obvious change of“locking”interval in sway. However, when 7.26 < Ur < 9.08, the amplitude of yaw increases approximately linearly with several peaks appearing near the dominant frequency, and the motion trajectory gradually widens in the downstream direction. In the three-dimensional flow field, it is found that the three-dimensional vortex structures is quite complex, and that the skirt structure at the bottom of the platform interferes with the surface flow separation, which results in a certain vortex reduction.
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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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