Alignment dynamics of diffusive scalar gradient in a two-dimensional model flow
Résumé
The Lagrangian two-dimensional approach of scalar gradient kinemat-ics is revisited accounting for molecular diffusion. Numerical simulations are performed in an analytic, parameterized model flow, which enables considering different regimes of scalar gradient dynamics. Attention is especially focused on the influence of molecular diffusion on Lagrangian statistical orientations and on the dynamics of scalar gradient alignment.
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