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Dynamics of helicity in homogeneous skew-isotropic turbulence

Published online by Cambridge University Press:  25 May 2017

Antoine Briard  and
Thomas Gomez Open the ORCID record for Thomas Gomez [Opens in a new window]
Antoine Briard
Affiliation:
$\unicode[STIX]{x2202}$’Alembert, CNRS UMR 7190, 4 Place Jussieu, F-75252 Paris CEDEX 5, France
Thomas Gomez*
Affiliation:
USTL, LML, F-59650 Villeneuve d’Ascq, France
*
†Email address for correspondence: [email protected]
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Abstract

The dynamics of helicity in homogeneous skew-isotropic freely decaying turbulence is investigated, at very high Reynolds numbers, thanks to a classical eddy-damped quasi-normal Markovian (EDQNM) closure. In agreement with previous direct numerical simulations, a $k^{-5/3}$ inertial range is obtained for both the kinetic energy and helical spectra. In the early stage of the decay, when kinetic energy, initially only present at large scales cascades towards small scales, it is found that helicity slightly slows down the nonlinear transfers. Then, when the turbulence is fully developed, theoretical decay exponents are derived and assessed numerically for helicity. Furthermore, it is found that the presence of helicity does not modify the decay rate of the kinetic energy with respect to purely isotropic turbulence, except in Batchelor turbulence where the kinetic energy decays slightly more rapidly. In this case, non-local expansions are used to show analytically that the permanence of the large eddies hypothesis is verified for the helical spectrum, unlike the kinetic energy one. Moreover, the $4/3$ law for the two-point helical structure function is assessed numerically at very large Reynolds numbers. Afterwards, the evolution equation of the helicity dissipation rate is investigated analytically, which provides significant simplifications and leads notably to the definition of a helical derivative skewness and of a helical Taylor scale, which is numerically very close to the classical Taylor longitudinal scale at large Reynolds numbers. Finally, when both a mean scalar gradient and helicity are combined, the quadrature spectrum, linked to the antisymmetric part of the scalar flux, appears and scales like $k^{-7/3}$ and then like $k^{-5/3}$ in the inertial range.

JFM classification

Turbulent Flows: Isotropic turbulence Turbulent Flows: Turbulent Flows
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Journal of Fluid Mechanics , Volume 821 , 25 June 2017 , pp. 539 - 581
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© 2017 Cambridge University Press 

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