000014733 001__ 14733
000014733 005__ 20161115100200.0
000014733 04107 $$aeng
000014733 046__ $$k2016-08-21
000014733 100__ $$aSahoo, Ganapati
000014733 24500 $$aEffects of helicity on the energy transfer in three-dimensional turbulence

000014733 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014733 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014733 506__ $$arestricted
000014733 520__ $$2eng$$aWe investigated the effects of the helicity in the dynamics of the energy transfer in turbulent flows using a modified version of the Navier-Stokes equations with explicit breaking of the mirror symmetry. With an external parameter that controls the imbalance between the number of positive and negative helical Fourier modes we aim to disentangle the role of helicity in the direction of the turbulent energy transfer. In an earlier study with helical projection, an inverse cascade of energy was observed in the three-dimensional Navier-Stokes equations when helicity was maintained sign-definite [1, 2]. In this study we measure the degree to which the parity symmetry controls the direction of the cascade. We introduce a mechanism in which the parity is broken stochastically but in a time frozen manner with helical constraints. We keep triadic interactions in Fourier space involving modes with definite sign of helicity and decimate the triads of other modes with opposite sign of helicity with a fixed probability. We observed a singular behaviour of the direction of the energy cascade measuring a positive forward flux as soon as only a few modes with different helical polarities take part in the dynamics.

000014733 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014733 653__ $$a

000014733 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014733 720__ $$aSahoo, Ganapati
000014733 8560_ $$ffischerc@itam.cas.cz
000014733 8564_ $$s79045$$uhttps://invenio.itam.cas.cz/record/14733/files/TS.FM14-3.02.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1419, code TS.FM14-3.02
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000014733 962__ $$r13812
000014733 980__ $$aPAPER