Instituto de Física Interdisciplinaria y Aplicada (INFINA)
This research quantitatively demonstrates the hysteretic behavior of turbulent energy dissipation in unsteady flows, showing that the dimensionless dissipation constant is larger during deceleration than acceleration for a given instantaneous Reynolds number. It establishes a universal scaling law that links the magnitude of this hysteresis to a new dimensionless forcing parameter, grounded in the unsteady term of the Kármán–Howarth equation.
The dispersion of Lagrangian particle pairs is a fundamental process in turbulence, with implications for mixing, transport, and the statistical properties of particles in geophysical and environmental flows. While classical theories describe pair dispersion through scaling laws related to energy cascades, extreme events in turbulent flows can significantly alter these dynamics. This is especially important in stratified flows, where intermittency manifests itself also as strong updrafts and downdrafts. In this study, we investigate the influence of extreme events on the relative dispersion of particle pairs in stably stratified turbulence. Using numerical simulations we analyze the statistical properties of pair separation across different regimes, and quantify deviations from classical Richardson scaling. Our results highlight the role of extreme drafts in accelerating dispersion. These findings have important implications for turbulent mixing in natural systems, including atmospheric and oceanic flows, as well as applications in cloud microphysics and pollutant transport.
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