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arXiv 0812.4725physics.flu-dyn
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三维充分发展turbulence中能量耗散率返回区间的标度和记忆

Scaling and memory in the return intervals of energy dissipation rate in three-dimensional fully developed turbulence

Chuang Liu, Zhi-Qiang Jiang, Fei Ren, Wei-Xing Zhou

摘要:

我们研究了三维充分发展湍流中连续能量耗散率高于一定阈值$Q$的返回间隔$r$的统计特性。我们发现分布函数$P_Q(r)$与平均收益区间$R_Q$成比例,除了$r=1$,其中比例函数$f(x)$具有两个幂律区域,其余均为$P_Q(r)=R_Q^{-1}f(r/R_Q)$。其回归区间具有短期和长期相关性,并具有多重分形性质。回归区间的赫斯特指数相对于$R_Q$呈指数衰减,预测$R_Q\to\infty$的罕见极端事件也与赫斯特指数$H_\infty=0.639$长期相关。

英文摘要:

We study the statistical properties of return intervals $r$ between successive energy dissipation rates above a certain threshold $Q$ in three-dimensional fully developed turbulence. We find that the distribution function $P_Q(r)$ scales with the mean return interval $R_Q$ as $P_Q(r)=R_Q^{-1}f(r/R_Q)$ except for $r=1$, where the scaling function $f(x)$ has two power-law regimes. The return intervals are short-term and long-term correlated and possess multifractal nature. The Hurst index of the return intervals decays exponentially against $R_Q$, predicting that rare extreme events with $R_Q\to\infty$ are also long-term correlated with the Hurst index $H_\infty=0.639$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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