DNS on a Spatially Developing Grid Turbulence
DNS on a Spatially Developing Grid Turbulence
复制标题
空间发展的网格湍流中的 DNS
DOI：
10.1088/1742-6596/318/3/032043
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.Hayase
中科院分区：
文献类型：
--
作者：
H.Suzuki;K.Nagata;Y.Sakai;T.Hayase
本研究的目的是通过基于有限差分法的直接数值模拟来研究空间发展网格湍流的基本统计特性。基于网格尺寸M的雷诺数为2500，由M归一化的流向计算域尺寸为112。湍流强度的流向分布表明，在x/M> 4的区域内，大尺度脉动速度场是准各向同性的，其中x是流向到网格的距离。在远下游区域，流向脉动速度u的导数偏度小于垂向和展向脉动速度的导数偏度。另一方面，u、v和w的导数平坦度在远下游区域几乎相同。
The purpose of this study is to investigate fundamental statistics of a spatially developing grid turbulence by means of direct numerical simulation based on the finite difference method. The Reynolds number based on the mesh size, M, is 2500, and streamwise computational domain size normalized by M is 112. The streamwise profiles of turbulent intensities show that the large-scale fluctuating velocity field is quasi-isotropic in the region x/M> 4, where x is the streamwise distance from the grid. The derivative skewness of streamwise fluctuating velocity u is smaller than those of vertical and spanwise fluctuating velocities in the far downstream region. On the other hand, the derivative flatness of u, v, and w are almost identical in the far downstream region.