Experimental study of oscillating-grid turbulence interacting with a solid boundary
Experimental study of oscillating-grid turbulence interacting with a solid boundary
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振荡网格湍流与固体边界相互作用的实验研究
DOI：
10.1017/jfm.2016.843
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发表时间：
2017
影响因子：
3.7
通讯作者：
R. J. Munro
中科院分区：
文献类型：
--
作者：
Mark W. McCorquodale;R. J. Munro
实验研究了平行网格湍流与固体不可渗透边界（位于网格下方，并与网格平行排列）之间的相互作用。瞬时速度测量，获得使用二维粒子成像测速仪在垂直平面通过中心的（水平）网格，被用来研究的均方根速度分量，湍流动能（TKE）的垂直通量和雷诺应力输运方程中的条款的边界的效果。被确定为相互作用的一个关键方面是阻止TKE的垂直通量跨越边界影响区域。雷诺应力输运方程的条款表明，这种能量通量的阻塞的行为，以增加边界切向湍流速度分量，相对于远场的趋势，但不是边界法向速度分量。结果进行了比较与以前的研究之间的相互作用的零平均剪切湍流和固体边界。特别地，这里报道的数据支持先前分别由Perot & Moin（J. Fluid Mech.，第295卷，1995年，第295页。199-227）和步行者等人（J.FluidMech.，第320卷，1996年，第320页。19-51），尽管我们注意到这些机制并不独立于能量通量的阻断，并且与Magnaudet（J. Fluid Mech.，第484卷，2003年，第484页。167-196）。
The interaction between oscillating-grid turbulence and a solid, impermeable boundary (positioned below, and aligned parallel to, the grid) is studied experimentally. Instantaneous velocity measurements, obtained using two-dimensional particle imaging velocimetry in the vertical plane through the centre of the (horizontal) grid, are used to study the effect of the boundary on the root-mean-square velocity components, the vertical flux of turbulent kinetic energy (TKE) and the terms in the Reynolds stress transport equation. Identified as a critical aspect of the interaction is the blocking of a vertical flux of TKE across the boundary-affected region. Terms of the Reynolds stress transport equations show that the blocking of this energy flux acts to increase the boundary-tangential turbulent velocity component, relative to the far-field trend, but not the boundary-normal velocity component. The results are compared with previous studies of the interaction between zero-mean-shear turbulence and a solid boundary. In particular, the data reported here are in support of viscous and ‘return-to-isotropy’ mechanisms governing the intercomponent energy transfer previously proposed, respectively, by Perot & Moin (J. Fluid Mech., vol. 295, 1995, pp. 199–227) and Walker et al. (J. Fluid Mech., vol. 320, 1996, pp. 19–51), although we note that these mechanisms are not independent of the blocking of energy flux and draw parallels to the related model proposed by Magnaudet (J. Fluid Mech., vol. 484, 2003, pp. 167–196).
影响因子：
4.6
作者：
Wan Mohtar, W. H. M.;Munro, R. J.
通讯作者：
Munro, R. J.