论文标题
振荡调节各向同性湍流中的功率定律指数：实验与模拟的比较
Oscillations Modulating Power Law Exponents in Isotropic Turbulence: Comparison of Experiments with Simulations
论文作者
论文摘要
使用来自周期盒中的各向同性湍流的实验测量数据中的数据，研究了湍流的惯性特征，均在泰勒级雷诺数$r_λ\ sim 1000上进行了模拟的各向同性湍流模拟。特别是，检查了在惯性范围内调节幂律缩放的振荡的结构功能，最高第六阶矩。但是，指数比率的振荡随着模拟的样本量的增加而降低，但是在实验中，即使在大规模平均后，它们的零售价为$ 4 $ $ 4 $的零件。这两个数据集的间歇性特征是一致的，但在较小但可观察到的尊重方面有所不同。现有的间歇性模型都不能始终如一地再现缩放指数本身和所有粘性效应。
Inertial-range features of turbulence are investigated using data from experimental measurements of grid turbulence and direct numerical simulations of isotropic turbulence simulated in a periodic box, both at the Taylor-scale Reynolds number $R_λ\sim 1000$. In particular, oscillations modulating the power-law scaling in the inertial range are examined for structure functions up to sixth order moments. The oscillations in exponent ratios decrease with increasing sample size in simulations though, in experiments, they survive at a low value of $4$ parts in $1000$ even after massive averaging. The two data sets are consistent in their intermittent character but differ in small but observable respects. Neither the scaling exponents themselves nor all the viscous effects are consistently reproduced by existing models of intermittency.
