期刊
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS
卷 25, 期 2, 页码 59-74出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10618562.2011.558010
关键词
backward-facing step (BFS) flow; large eddy simulation (LES); suction; separation control; reattachment length
资金
- National Natural Science Foundation of China [59895410]
Separation control over a backward-facing step (BFS) flow by continuous suction was numerically investigated using the turbulence model of large eddy simulation (LES). The effect of suction control on the flow fields was scrutinised by altering the suction flow coefficient, and the results indicate that suction is not only very effective in shortening the reattachment length but also very influential in reducing the tangential velocity gradient and turbulence fluctuations of the reattached flows. With increasing increments of the absolute suction flow coefficient, the effect of suction control is more significant. Furthermore, the detailed flow fields (including the time-averaged stream and velocity fields) and turbulence characteristics (including the time-averaged resolved kinetic energy and RMS velocity) for the BFS models with or without suction are presented to discuss the mechanism of suction control. Comparisons of the time-averaged statistics between the numerical simulations and corresponding experiments are conducted, and it shows that the LES based on the dynamic kinetic energy subgrid-scale model (DKEM) can acquire exact results. Therefore, feasibility of the numerical methods to simulate suction-controlled models is validated.
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