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周炜星

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期刊论文

Inverse statistics and multifractality of exit distances in 3D fully developed turbulence

周炜星Wei-Xing Zhou Didier Sornette Wei-Kang Yuan

Physica D 214 (2006) 55-62,-0001,():

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摘要/描述

The inverse structure functions of exit distances have been introduced as a novel diagnostic of turbulence which emphasizes the more laminar regions [1–4]. Using Taylor’s frozen field hypothesis, we investigate the statistical properties of the exit distances of empirical 3D fully developed turbulence. We find that the probability density functions of exit distances at different velocity thresholds ξ v can be approximated by stretched exponentials with exponents varying with the velocity thresholds below a critical threshold. We show that the inverse structure functions exhibit clear extended self-similarity (ESS). The ESS exponents ξ(p, 2) for small p (p < 3.5) are well described byζ(p, 2) = p/2, which derives from the observed approximate universality of the distributions of the exit distances for different velocity thresholds ξ v. The data is not sufficient to reject the hypothesis that monofractal ESS is sufficient to explain the data. In contrast, a measure taking into account the dependence between successive exit distances at a given velocity threshold exhibits clear multifractality with negative dimensions, suggesting the existence of a nontrivial dependence in the time series of exit times.

【免责声明】以下全部内容由[周炜星]上传于[2007年11月19日 15时30分40秒],版权归原创者所有。本文仅代表作者本人观点,与本网站无关。本网站对文中陈述、观点判断保持中立,不对所包含内容的准确性、可靠性或完整性提供任何明示或暗示的保证。请读者仅作参考,并请自行承担全部责任。

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