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Updated: Sep 23, 2026

Evolution of Staircase Structures in Diffusive Convection
Published on: September 5, 2018
Growth of helicity in salt-finger convection in the two-dimensional three-component limit
Smiron Varghese1, Benjamin Miquel1, Wouter J T Bos1
1LMFA, Université Lyon 1, INSA Lyon, École Centrale de Lyon, CNRS, UMR5509, 69134 Écully, France.
Abstract:
We present an analytical investigation of the global helicity budget associated with the salt-fingering instability within the two-dimensional, three-component framework. Our analysis shows that in the region of parameter space corresponding to salt fingering, helicity amplification occurs when the Rayleigh ratio-quantifying the relative strength of salinity to temperature gradients-exceeds a critical threshold. This finding provides a possible theoretical explanation for the spontaneous emergence of helicity, observed in recent numerical simulations.
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