Near-field investigation of turbulence produced by multi-scale grids
Near-field investigation of turbulence produced by multi-scale grids
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DOI：
10.1063/1.3693132
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发表时间：
2012-03
影响因子：
4.6
通讯作者：
P. Krogstad;P. Davidson
中科院分区：
文献类型：
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作者：
P. Krogstad;P. Davidson
我们调查网格湍流背后的两个多尺度网格和一个传统的，特别强调的近场湍流的属性。所有三个网格的设计都是为了在下游两米（x = 2 m）处产生相同的积分比例l0。我们发现，湍流是高度不均匀的x50 l0。目前网格的近场湍流结构取决于所用网格的类型，表现出许多奇怪的性质，这与早期的研究是一致的[D。赫斯特和J.C. Vassilicos，“Scalings and decay of fractal-generated turbulence，”Phys. Fluids 19，035103（2007）]。然而，所有三个网格的远场非常相似。例如，对于所有三个网格，远场能量衰减速率实际上是相同的，如Krogstad和Davidson所示[“Freely-decaying，homogeneous turbulence generated by multiscale grids，”J. Fluid Mech.680，417（2011）]。这...
We investigate grid turbulence behind two multi-scale grids and one conventional one, with particular emphasis on the properties of the near-field turbulence. All three grids are designed to produce the same integral scale, l0, at a downstream distance of two meters (x = 2 m). We find that the turbulence is highly inhomogeneous for x 50l0. The structure of the near-field turbulence for the present grids is dependent on the type of grid used, exhibiting a number of curious properties, which is consistent with earlier studies [D. Hurst and J. C. Vassilicos, “Scalings and decay of fractal-generated turbulence,” Phys. Fluids 19, 035103 (2007)]. However, the far-field is remarkably similar for all three grids. For example, the far-field energy decay rate is virtually identical for all three grids, as was shown by Krogstad and Davidson [“Freely-decaying, homogeneous turbulence generated by multiscale grids,” J. Fluid Mech. 680, 417 (2011)]. Thi...