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Intermittency in Shell Models of Turbulent Cascades: from Single-Branch to Multi-Branch
Flavio Tuteri, Sergio Chibbaro, Alexandros Alexakis
Intermittency is one of the central features of turbulent transfer: the multi-scale energy cascade is mediated by rare and intense fluctuations. We investigate this phenomenon in a…
Sub-Kolmogorov Intermittency and Multifractal Dissipation in Multiphase Turbulence
Marco Crialesi-Esposito, Alienor Riviere, Sergio Chibbaro
Multiphase turbulence displays stronger intermittency than its single-phase counterpart, yet the origin and geometrical organization of its most intense small-scale fluctuations re…
Two-point enstrophy dynamics in homogeneous isotropic turbulence
Gabriele Boga, Carlos B. da Silva, Sergio Chibbaro +1
In the present work we investigate the multiscale dynamics of enstrophy in homogeneous isotropic turbulence by exploiting the two-point formalism provided by the Kármán-Howarth-Mon…
Turbulent pair dispersion with Stochastic Generative Diffusion Models
Andrei Pantea, Luca Biferale, Michele Buzzicotti +3
Recent advances in data-driven modeling have shown that diffusion models can successfully generate synthetic Lagrangian trajectories in turbulent flows. Building on this progress,…
Multi-branch Shell Models of Two-Dimensional Turbulence exhibit Dual Energy-Enstrophy Cascades
Flavio Tuteri, Sergio Chibbaro, Alexandros Alexakis
Classical shell models of turbulence do not display dual cascade - inverse of energy and direct of enstrophy - because they fail to reproduce the right thermal spectra. We propose…
Ensemble of Fixed Points in Multi-branch Shell Models of Turbulent Cascades
Flavio Tuteri, Sergio Chibbaro, Alexandros Alexakis
Stationary solutions of a shell model of turbulence defined on a dyadic tree topology are studied. Each node's amplitude is expressed as the product of amplitude multipliers associ…
Fluctuations around Turbulence Models
Flavio Tuteri, Alexandros Alexakis, Sergio Chibbaro
Numerical simulations of turbulent flows at realistic Reynolds numbers generally rely on filtering out small scales from the Navier Stokes equations and modeling their impact throu…
Assessment of the point-wise approach for the Turbulent Settling of finite-size particles
Francesco Battistaa, Sergio Chibbarob, Paolo Gualtieria
We study the settling of suspensions of relatively large particles with a diameter of the order of ten Kolmogorov scales and density slightly larger than the carrier fluid in stati…