Relative Scaling Exponents and Intermittency in Compressible Turbulent Channel Flows
Relative Scaling Exponents and Intermittency in Compressible Turbulent Channel Flows
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DOI：
10.1088/0256-307x/22/12/037
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发表时间：
2005-12
影响因子：
3.5
通讯作者：
Hu Kai-heng;C. Kai
中科院分区：
文献类型：
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作者：
Hu Kai-heng;C. Kai
本文用直接数值模拟方法研究了三维可压缩湍流通道的相对标度指数和不稳定性。一种情况是亚音速流（Ma = 0.8），另一种是超音速流（Ma = 1.3），基于平均体积速度和通道半宽的雷诺数分别为2826和3010。对六阶速度结构函数到三阶速度结构函数的局部斜率分析表明，当10 < y（+）< 100时，存在一个明确的标度范围。在此区域内，纵向速度增量的不稳定性比横向速度增量的不稳定性强。与不可压情况的比较表明，最强不稳定性的位置移向对数律区域，这与近壁区流向涡结构的位移有关。
The relative scaling exponents and intermittency of three-dimensional compressible turbulent channel now are investigated by using direct numerical simulation. One case is subsonic flow (Ma = 0.8), the other is supersonic (Ma = 1.3), and the Reynolds numbers based on the mean bulk velocity and channel half-width are 2826 and 3010, respectively. The analysis of the local slopes of sixth order velocity structure function to third order reveals that there is a well-defined scaling range for 10 < y(+) < 100. It is also noted that the intermittency of longitudinal velocity increments in this region is stronger than that of the transverse ones. Comparison with the incompressible case shows that the location of the most intensive intermittency moves toward the log-law region, which is related to the displacement of streamwise vortical structures in the near-wall region.