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Helical turbulence: turbulent viscosity and instability of the second moments

机译：螺旋湍流：湍流粘度和第二矩的不稳定性

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摘要

The evolution of weak large-scale disturbances in the helical turbulence is considered. High-order statistical moments are taken into account in the frames of two-scale analog of Orszag diffusion approximation. The appearance of the instability of second moments is demonstrated for k < alphau (k is wave vector, alpha and nu are proportional to the mean helicity and mean energy viscosity, respectively). Turbulent viscosity diminishing in comparison with the non-helical case is also demonstrated. These phenomenona qualitatively agree with previous results of other authors on the slow-down of energy transfer along the spectrum, from large to small scales at non-zero helicity. (C) 1998 Published by Elsevier Science B.V. All rights reserved. [References: 28]
机译：考虑了螺旋湍流中弱大尺度扰动的演化。在Orszag扩散近似的两尺度模拟框架中考虑了高阶统计矩。对于k

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