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Spontaneous generation and reversal of helicity in anisotropic turbulence

Abstract : Helicity plays an important role in spectacular geophysical phenomena such as hurricanes or the generation of the terrestrial magnetic field. The present investigation shows how helicity can be created in a statistically homogeneous but anisotropic flow, driven by buoyancy. If the flow is close enough to a two-dimensional limit, spontaneous symmetry breaking leads to the generation of mean helicity. In particular, we explain these observations by identifying a simple linear mechanism, the relevance of which is illustrated by simulations of unstably stratified turbulence in a conducting fluid on which a magnetic field is imposed. Finally it is shown that the self-organized state displays dynamical reversals of the sign of the mean helicity.
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Contributeur : Wouter Bos <>
Soumis le : mardi 8 juin 2021 - 16:42:57
Dernière modification le : vendredi 11 juin 2021 - 03:30:18


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Wesley Agoua, Benjamin Favier, Alexandre Delache, Antoine Briard, Wouter Bos. Spontaneous generation and reversal of helicity in anisotropic turbulence. Physical Review E , American Physical Society (APS), 2021, ⟨10.1103/PhysRevE.103.L061101⟩. ⟨hal-03254268⟩



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