Coherence and large fluctuations of helicity in homogeneous turbulence
Coherence and large fluctuations of helicity in homogeneous turbulence
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均匀湍流中螺旋度的相干性和大波动
DOI：
10.1016/0375-9601(88)90754-2
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发表时间：
1988
影响因子：
2.6
通讯作者：
L. Shtilman
中科院分区：
文献类型：
--
作者：
E. Levich;L. Shtilman
大他的重要性和内在本质！P是压力，0（v）包括所有粘性项。在许多文献[1-61]中，从（3）中得出惯性项守恒的结论。在这一猜想的推论中，当三维湍流中螺旋度起伏r = 4时，有可能存在“in-< y（0）F（r）>= 0（1/r ~ 2 H ~ 1）”。实验和数值研究表明，这种要求很可能得到满足。事实上，已经指向其他螺旋re！ated quan-基于迄今为止未显示的准正态统计性质的估计值与hel- sumption明显相关，表明了icity波动[8-11]。本文注记< y（0）F（r）>= 0（l/r9 ~（-51））的目的是提出一个概念！的背景，并提供了结果，我们得出的结论是数值模拟初步支持的螺旋度波动的想法，
The importance and intrinsic nature of large he!- P is pressure and 0 (v) includes all viscous terms. It icity fluctuations in turbulent flow was conjectured follows from (3) that the inertial term conserves I in a number of papers [1—61. Among the implica- provided that tions of this conjecture is the possibility of an “in-< y (0) F (r)>= 0 (1/r2H~~ l) when r—~~(4) verse cascade of helicity fluctuations 3-D turbulent flows [2, 7]. Experimentaland numericalstudieshave The requirement is most probably satisfied. Indeed, been directed towards other helicity re! ated quan- the estimate based on a quasi-normal statistical astities not shown, so far, to be clearly related to hel- sumption indicates that icity fluctuations [8—11]. The purpose of this note< y (0) F (r)>= 0 (l/r9~’51) is to present a conceptua! background behind the ideas of helicity fluctuations, and provide results of The conclusion we draw is numerical simulations tentatively supporting the