期刊
PHYSICS OF FLUIDS
卷 21, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3177352
关键词
compressible flow; flow instability; flow simulation; numerical analysis; turbulence
资金
- Centre National d'Etudes Spatiales (CNES)
- ONERA
The present work focuses on the intrinsic properties of an axisymmetric separating/reattaching flow. A numerical simulation of a compressible flow over a cylinder extended by another cylinder of smaller diameter is performed at a Reynolds number based on free stream velocity U-infinity and on the diameter of the larger cylinder D of 1.2x10(6). Statistical and fluctuating properties are scrutinized and compared with the available experimental data. Especially, experimental wall pressure coefficient and rms pressure fluctuations are well-reproduced by the simulation. A large scale coherent motion associated to fD/U-infinity approximate to 0.2 rules the organization of the flow. Moreover, these properties are linked to a linear stability analysis coupled with a two-point correlation analysis unveiling the major importance of highly coherent antisymmetric modes in the flow behavior. Finally, the axisymmetric body dynamics seems to be led by a significant absolutely unstable area suggesting a global instability mechanism.
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