Is the scaling of supersonic turbulence universal?
Is the scaling of supersonic turbulence universal?
复制标题
DOI：
10.1103/physrevlett.101.194505
复制
发表时间：
2008-10
影响因子：
8.6
通讯作者：
W. Schmidt;C. Federrath;R. Klessen
中科院分区：
文献类型：
--
作者：
W. Schmidt;C. Federrath;R. Klessen
湍流的统计特性被认为在足够小的长度尺度上是普遍的，即，与边界条件和作用在流体上的大规模力无关。分析数据的超音速湍流的数值模拟驱动的外部强迫，我们表明，这是不一般的两点速度统计的可压缩湍流。然而，重新制定的质量加权速度rho 1/3v方面的改进的相似性假设产生的标度律，几乎是不敏感的强迫。结果表明，大多数间歇性耗散结构的冲击密切遵循Burgers湍流标度。
The statistical properties of turbulence are considered to be universal at sufficiently small length scales, i.e., independent of boundary conditions and large-scale forces acting on the fluid. Analyzing data from numerical simulations of supersonic turbulent flow driven by external forcing, we demonstrate that this is not generally true for the two-point velocity statistics of compressible turbulence. However, a reformulation of the refined similarity hypothesis in terms of the mass-weighted velocity rho1/3v yields scaling laws that are almost insensitive to the forcing. The results imply that the most intermittent dissipative structures are shocks closely following the scaling of Burgers turbulence.