Extraction of anisotropic contributions in turbulent flows

被引:135
作者
Arad, I [1 ]
Dhruva, B
Kurien, S
L'vov, VS
Procaccia, I
Sreenivasan, KR
机构
[1] Weizmann Inst Sci, Dept Chem Phys, IL-76100 Rehovot, Israel
[2] Yale Univ, Mason Lab, New Haven, CT 06520 USA
[3] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[4] Russian Acad Sci, Inst Automat & Electrometry, Novosibirsk 630090, Russia
关键词
D O I
10.1103/PhysRevLett.81.5330
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We analyze turbulent velocity signals in the atmospheric surface layer, obtained by pairs of probes separated by inertial-range distances parallel to the ground and (nominally) orthogonal to the mean wind. The Taylor microscale Reynolds number ranges up to 20000. Choosing a suitable coordinate system with respect to the mean wind, we derive theoretical forms for second order structure functions and fit them to experimental data. The effect of flow anisotropy is small for the longitudinal component but significant for the transverse component. The data provide an estimate for a universal exponent from among a hierarchy that governs the decay of flow anisotropy with the scale size.
引用
收藏
页码:5330 / 5333
页数:4
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