Journal
PHYSICAL REVIEW E
Volume 103, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.103.L061101
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Funding
- French Federation for Magnetic Fusion Studies (FRFCM)
- EUROfusion consortium from the Euratom research and training programme 2014-2018 and 2019-2020 [633053]
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The study discusses the generation of helicity in a statistically homogeneous but anisotropic flow driven by buoyancy, and explains this phenomenon through a simple linear mechanism and simulations. It is found that the self-organized state displays dynamic reversals of the mean helicity sign.
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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