2009•Physical Review ERequires access
Alignment of velocity and vorticity and the intermittent distribution of helicity in isotropic turbulence
Yeontaek Choi, Byung‐Gu Kim, Changhoon Lee
Open publisher page 26 citations
Abstract
We provide an observation suggesting a strong correlation between helicity and enstrophy in fluid turbulence. Helicity statistics were obtained in a direct numerical simulation of forced isotropic turbulence. An investigation of coherent structures revealed that intermittently large local helicity was found in the core region of the coherent rotational structures, thus showing a strong correlation with local enstrophy, not dissipation. Statistics regarding the relative helicity and the correlation between velocity and vorticity conditioned on different levels of enstrophy clearly suggest that velocity and vorticity tend to be aligned in the core of the coherent structures.