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In this paper, to study the evolution pattern of wake vortices past two crossing cylinders in 60 degrees arrangement at the gap ratio of G=4 and the Reynolds number of Re=200, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) were employed to analyze the magnitude vorticity data. The analysis results indicate that the spatial scale of wake vortices decreases with the frequency increasing. The large-scale flow phenomena in the wake can be approximately reconstructed by a few low-frequency modes, while high-frequency modes mainly enrich the small-scale turbulence details. Wake vortices shed from upstream and downstream cylinders at a frequency of 0.19 Hz and propagate toward downstream in parallel morphology with the same frequency. The interaction of the vortex shedding from upstream cylinder on the downstream cylinder causes a significant vortex-induced vibration(VIV) on the downstream cylinder and results in multiple peaks in its lift coefficient spectrum.
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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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