Direct Numerical Simulation of Turbulent Pipe Flow at Moderately High Reynolds Numbers
Direct Numerical Simulation of Turbulent Pipe Flow at Moderately High Reynolds Numbers
复制标题
DOI：
10.1007/s10494-013-9482-8
复制
发表时间：
2013-10-01
影响因子：
2.4
通讯作者：
Johansson, Arne V.
中科院分区：
文献类型：
--
作者：
El Khoury, George K.;Schlatter, Philipp;Johansson, Arne V.
采用高阶谱元方法对不可压缩粘性流体在半径为R、轴长为25R的光滑圆管中的湍流流动进行了全分辨直接数值模拟，研究了四种不同摩擦雷诺数Re（τ）= 180、360、550和.新的数据集与其他模拟数据集，在管道，通道和边界层几何形状。特别强调了不同管道DNS之间的差异。事实证明，压力是管道、通道和边界层之间差异最大的变量，导致平均压力和压力波动显着不同，这可能与更强的尾流区域有关。在缓冲层中，轴向速度波动强度的内峰随雷诺数的变化在通道流和边界层流之间是相似的，但是对于管道来说较低，而压力波动的内峰在管道流和通道流之间显示出可忽略的差异，但是明显低于对于边界层的压力波动的内峰，这与对于波动壁面剪应力的行为相同。最后，湍流动能收支在靠近壁面的规范流之间几乎是不可区分的（高达y（+）a千分之一aEuro千分之100），而在外层的产生和耗散中观察到了实质性的差异。一个明确的雷诺数依赖性记录的三个流动配置。
Fully resolved direct numerical simulations (DNSs) have been performed with a high-order spectral element method to study the flow of an incompressible viscous fluid in a smooth circular pipe of radius R and axial length 25R in the turbulent flow regime at four different friction Reynolds numbers Re (tau) = 180, 360, 550 and . The new set of data is put into perspective with other simulation data sets, obtained in pipe, channel and boundary layer geometry. In particular, differences between different pipe DNS are highlighted. It turns out that the pressure is the variable which differs the most between pipes, channels and boundary layers, leading to significantly different mean and pressure fluctuations, potentially linked to a stronger wake region. In the buffer layer, the variation with Reynolds number of the inner peak of axial velocity fluctuation intensity is similar between channel and boundary layer flows, but lower for the pipe, while the inner peak of the pressure fluctuations show negligible differences between pipe and channel flows but is clearly lower than that for the boundary layer, which is the same behaviour as for the fluctuating wall shear stress. Finally, turbulent kinetic energy budgets are almost indistinguishable between the canonical flows close to the wall (up to y (+) a parts per thousand aEuro parts per thousand 100), while substantial differences are observed in production and dissipation in the outer layer. A clear Reynolds number dependency is documented for the three flow configurations.