Helical turbulence: Turbulent viscosity and instability of the second moments

A. Belian, O. Chkhetiani, E. Golbraikh and S. Moiseev

Physica A: Statistical Mechanics and its Applications, 1998, vol. 258, issue 1, 55-68

Abstract: 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<α/ν (k is wave vector, α and ν 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.

Keywords: Helical turbulence; Instability; Viscosity (search for similar items in EconPapers)
Date: 1998
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:258:y:1998:i:1:p:55-68

DOI: 10.1016/S0378-4371(98)00212-X

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