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The phenomenon of flow-induced vibrations with small amplitude and strong fluid-structure interaction is commonly found in both nature and engineering practice. This paper proposes a frozen boundary method, which keeps the boundary fixed and represents the boundary vibration effects using mass sources and momentum sources. This method is applied to calculate forced vibrations and vortex-induced vibrations of a circular cylinder with a single degree of freedom. The results show that in forced vibrations, the frozen boundary method improves computation speed compared to the dynamic mesh method while ensuring calculation accuracy, thus validating the reliability of the method. For the single degree of freedom vortex-induced vibration of the circular cylinder, the phenomenon of lock-in was successfully computed. Due to the resonance effects within the lock-in region, the lateral fluctuations of the cylinder's wake field are considerable. The wake-vortex lock-in results from the competition between the vibrating vortex system and the detached vortex system. When the vibrating vortex system dominates, it manifests as frequency locking, leading to resonance. The frozen boundary method provides a new perspective and implementation approach for calculating fluid-structure interaction problems.
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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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