Energy flux and high-order statistics of hydrodynamic turbulence

Energy flux and high-order statistics of hydrodynamic turbulence
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流体动力湍流的能量通量和高阶统计

DOI:
10.1017/jfm.2023.662
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发表时间:
2023
影响因子:
3.7
通讯作者:
L'vov, Victor S.
L'vov, Victor S.
中科院分区:
工程技术2区
文献类型:
--
作者:
Lvov, Yuri V.;L'vov, Victor S.

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相似文献

本文用Dyson-Wyld图解技术分析了水动力湍流中速度关联函数的无穷级数。我们论证了速度的三重相关器在确定流体动力湍流的全部统计量中所起的基本作用。所有的高阶相关函数都用三重相关器表示。这一点通过建议的多点相关函数的无限图解级数的三角求和来说明。三角求和是格林函数和双相关器的戴森-怀尔德线求和之后的下一个逻辑步骤。特别是,它使我们能够解释为什么二维流体动力湍流的逆级联接近于高斯。由于三重相关器决定了能量通量,因此它是流体动力湍流的主要特征之一。
We use the Dyson–Wyld diagrammatic technique to analyse the infinite series for the correlation functions of the velocity in hydrodynamic turbulence. We demonstrate the fundamental role played by the triple correlator of the velocity in determining the entire statistics of the hydrodynamic turbulence. All higher-order correlation functions are expressed through the triple correlator. This is shown through the suggested triangular re-summation of the infinite diagrammatic series for multi-point correlation functions. The triangular re-summation is the next logical step after the Dyson–Wyld line re-summation for the Green's function and the double correlator. In particular, it allows us to explain why the inverse cascade of the two-dimensional hydrodynamic turbulence is close to Gaussian. Since the triple correlator dictates the flux of energy is one of the main characteristics of hydrodynamic turbulence.
DOI: --
发表时间: 1999
期刊:
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