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As a magnetic spring to provide restoring force for the rigid oscillator, the magnetic levitation support system is of great significance in the flow-induced vibration ocean current energy capture. To investigate the influence of different magnetic spring stiffness on the flow-induced vibration of cylindrical oscillators, the coupling model of the flow-induced vibration of a rigid cylindrical oscillator and its magnetic suspension support was constructed by using the RANS and the Maxwell-Ampere law without free current. The amplitude ratio, vibration frequency and wake vortex shedding pattern of the rigid cylindrical oscillator were analyzed under the action of magnetic spring stiffness of different magnetic suspension support forces. The results show that (1) the amplitude ratio of the oscillator increases first and then decreases with the increase of the flow velocity, and the maximum amplitude ratio decreases gradually with the increase of the spacing; (2) the oscillator reaches the maximum amplitude ratio of 0.844 at a flow velocity of 0.8 m/s and a spacing of 3.8D; (3) the vibration frequency of the oscillator increases with the increase of the spacing, and the growth trend tends to be gentle; (4) the oscillator reaches the maximum vibration frequency of 1.62 Hz at a flow velocity of 0.9 m/s and a spacing of 3.4D; (5) the wake vortex mode becomes more complex with the increase of spacing and velocity, and four wake vortex modes have appeared in the whole velocity range.
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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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