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The objective of this study is to characterise the different regimes of flow dynamics in non-helical and helical density-stratified turbulent flows. A systematic investigation of the effect of stratification and helicity on the evolution of the turbulent structure is carried out. These issues are addressed using high-resolution DNS applied to two transition-to-turbulence problems in the strongly stratified regime.
(Rahimi & Chandy, 2015)
Snapshots of coherent vortices represented in the normalized second invariant of velocity gradient, colored by shear, obtained from direct numerical simulations (DNS) of stratified Taylor-Green vortex at different times (increasing from left-to-right) and at Froude numbers of (a) 4 (b) 1 (c) 0.5 and (d) 0.16; The damping of turbulence by the buoyancy forces as a result of increase in stratification via decrease in Froude number is evident.
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