期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 62, 期 -, 页码 423-436出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2016.09.001
关键词
Thin normal flat plate; DNS; Infinite span; Turbulence; Shear layer; Wake dynamics; Periodic wake
资金
- National Science and Engineering Research Council of Canada (NSERC)
- Alberta Innovates Technology Futures (AITF)
- ENMAX Corp.
- Compute Canada
- NSERC
- AITF
The wake of an infinite, two-dimensional (2D), thin flat plate of height h was studied using Direct Numerical Simulation (DNS) for two Reynolds numbers, Re = 1.2 x 10(3) and 2.4 x 10(3). The vortex shedding Strouhal number was 0.158. In addition to the high - and low - intensity shedding regimes (H and L) first reported by Najjar and Balachandar (1998), a distinct period of reorganization (M) is identified following regime H. The average flow characteristics for regime M are similar to those of the long-term mean flow. The regime-averaged recirculation length at Re = 1.2 x 10(3) was 2.16h during H, 3.60h during L and 2.81h during M. Whereas the spanwise vortex rollers are well-organized during both regimes H and M, the arrangement of the streamwise ribs is much more regular and can be observed further downstream in regime H than M. The flow is highly three-dimensional during regime L, which includes less-coherent vortex rollers and spanwise randomly distributed ribs. The impact of this behavior on the roll-up, and thus the extension of the shear layer, is identified as a driving mechanism for generation and sustainability of the periodic wake behavior. (C) 2016 Elsevier Inc. All rights reserved.
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