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Two-dimensional numerical simulation was conducted to investigate the characteristics of fluid-induced vibration of a D-section prism with two degrees of freedom at an attack angle of 90°and a mass ratio of 2.6. The RANS equations were solved with the SST k-ω turbulent model closure. Uniform acceleration of inlet velocity and Newmark-β method were incorporated. Firstly the sensitivity analysis of the grid and time step in the present numerical model was carried out, then the comparisons with published experimental results were made to validate the existing numerical model. Then, a systematic analysis of response amplitude, vibration frequency, hydrodynamic coefficient, wake vortex shedding mode and average position-offset was made. The D-section prism exhibits combined response of VIV and galloping modes at a reduced velocity range of Ur=8-14, with vortex shedding pattern alternating between 2S and S+2S. The response amplitude of the two-degree-of-freedom prism is often stronger than that of the one-degree-of-freedom one. The lift force is inclined to the straight side of the section, and more than one frequency multiplications were found for the lift force. The average position-offsets of both cross-flow and downstream direction have maximum values exceeding one characteristic length.
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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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