A gas-phase near-isotropic turbulence and its wavelet analysis for studying fine-scale intermittency

被引：0

作者：

Yang, TS ^{[1
]}

Shy, SS ^{[1
]}

机构：

[1] Natl Cent Univ, Dept Mech Engn, Chungli 32054, Taiwan

来源：

IUTAM SYMPOSIUM ON REYNOLDS NUMBER SCALING IN TURBULENT FLOW | 2004年 / 74卷

关键词：

fine-scale intermittency; velocity structure function; wavelet transform; digital particle image velocimetry; near-isotropic turbulence;

D O I：

暂无

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The correlations between spatial and temporal behaviours of both fine-scale intermittency and the scaling of n(th)-order velocity structure function in a near-isotropic turbulence are studied experimentally, without adopting Taylor's hypothesis, using a high-speed digital particle image velocimetry together with the wavelet transform analysis. In the dissipation range, the spatial and the temporal intermittency of intense vorticity structures occur around 5similar to 10 eta and tau(1o) respectively, where eta and tau(k) are the Kolmogorov length and time scale of turbulence. In the inertial range the anomalous scalings of both spatial and temporal velocity structure functions are identical and values of scaling exponents are found to be within the range between the beta-model and the She-Leveque model.

引用

页码：249 / 252

页数：4