Full
Outline
The Richtmyer-Meshkov instability occurring on a heavy gas (SF6) bubble surrounded by N2 is numerically investigated in the present work. The interface evolution, shock focusing and jet development are emphasized. Numerical schlieren images and distributions of pressure, density and vorticity are exhibited for an incident shock wave of Mach number 1.23. The jet velocity, circulation and baroclinic torque versus time as well as peak values of pressure and density in the flow field are quantitatively analyzed. The results indicate that SF6 gas bubble accelerated by a planar shock wave has a strong cumulative energy effect so that it produces nearly ideal shock focusing and point source explosion phenomenon near the downstream pole within the bubble interface, which directly results in a secondary wave pattern and a slender jet moving in the streamwise direction. Compared with the secondary wave pattern, the incident shock wave brings on more intense baroclinic torque and vorticity.
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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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