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首页> 外文期刊>Journal of Statistical Physics >1/f(alpha) Low Frequency Fluctuations in Turbulent Flows Transitions with Heavy-Tailed Distributed Interevent Durations
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1/f(alpha) Low Frequency Fluctuations in Turbulent Flows Transitions with Heavy-Tailed Distributed Interevent Durations

机译：具有重尾分布式事件持续时间的湍流过渡中的1 / f（alpha）低频波动

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摘要

We report the experimental observation of low frequency fluctuations with a spectrum varying as in three different turbulent flow configurations: the large scale velocity driven by a two-dimensional turbulent flow, the magnetic field generated by a turbulent swirling flow of liquid sodium and the pressure fluctuations due to vorticity filaments in a swirling flow. For these three systems, noise is shown to result from the dynamics of coherent structures that display transitions between a small number of states. The interevent duration is distributed as a power law. The exponent of this power law and the nature of the dynamics (transition between symmetric states or asymmetric ones) select the exponent of the fluctuations.
机译：我们报告了低频波动的实验观察，其频谱在三种不同的湍流配置中变化：二维湍流驱动的大规模速度，液钠的湍流涡流产生的磁场以及压力波动由于涡流，细丝在旋流中流动。对于这三个系统，显示噪声是由显示少量状态之间转换的相干结构的动力学产生的。间隔时间作为幂律分布。该幂定律的指数和动力学性质（对称状态或非对称状态之间的过渡）选择波动的指数。

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