Reynolds number effects on scale energy balance in wall turbulence
Reynolds number effects on scale energy balance in wall turbulence
复制标题
雷诺数对壁面湍流中尺度能量平衡的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Piva
中科院分区：
文献类型：
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作者：
N. Saikrishnan;E. Angelis;E. Longmire;I. Marusic;C. Casciola;R. Piva
标度能量收支利用壁面湍流的经典Kolmogorov方程的修正版本来发展二阶结构函数的演化方程[R.J.Hill，《精确的二阶结构-函数关系》，J.流体机械。468,317(2002)]。这一方法允许在整个物理域和尺度范围内同时表征湍流切变流动中的能量级联和空间通量。本文利用这一方法研究了雷诺数对槽道湍流中能流平衡的影响。Reτ = 300-934范围内的直接数值模拟数据与以前在Reτ = 180上发表的结果进行了比较[N.Marati、C.M.Casciola和R.Piva，“壁面湍流中的能量级联和空间通量”，J.流体力学。521,191(2004年)]。结果表明，无论是粘性亚层还是缓冲区域，都不存在尺度能量收支的雷诺数效应。
The scale energy budget utilizes a modified version of the classical Kolmogorov equation of wall turbulence to develop an evolution equation for the second order structure function [R. J. Hill, “Exact second-order structure-function relationships,” J. Fluid Mech. 468, 317 (2002)]. This methodology allows for the simultaneous characterization of the energy cascade and spatial fluxes in turbulent shear flows across the entire physical domain as well as the range of scales. The present study utilizes this methodology to characterize the effects of Reynolds number on the balance of energy fluxes in turbulent channel flows. Direct numerical simulation data in the range Reτ = 300–934 are compared to previously published results at Reτ = 180 [N. Marati, C. M. Casciola, and R. Piva, “Energy cascade and spatial fluxes in wall turbulence,” J. Fluid Mech. 521, 191 (2004)]. The present results show no Reynolds number effects in the terms of the scale energy budget in either the viscous sublayer or buffer regions of t...