We present a review and a new assessment of the Lagrangian dispersion properties of a 2D model of chaotic advection and diffusion in a regular lattice of non stationary kinematic eddies. This model represents an ideal case for which it is possible to analyze the same system from three different perspectives: theory, modelling and experiments. At this regard, we examine absolute and relative Lagrangian dispersion for a kinematic flow, a hydrodynamic model (Delft3D), and a laboratory experiment, in terms of established dynamical system techniques, such as the measure of (Lagrangian) finite-scale Lyapunov exponents (FSLE). The new main results concern: (i) an experimental verification of the scale-dependent dispersion properties of the chaotic advection and diffusion model here considered; (ii) a qualitative and quantitative assessment of the hydro-dynamical Lagrangian simulations. The latter, even though obtained for an idealized open flow configuration, contributes to the overall validation of the computational features of the Delft3D model.

Numerical and experimental analysis of Lagrangian dispersion in two-dimensional chaotic flows / La Forgia, Giovanni; Cavaliere, Davide; Espa, Stefania; Falcini, Federico; Lacorata, Guglielmo. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 12:1(2022). [10.1038/s41598-022-11350-1]

Numerical and experimental analysis of Lagrangian dispersion in two-dimensional chaotic flows

Cavaliere, Davide;Espa, Stefania;Falcini, Federico;Lacorata, Guglielmo
2022

Abstract

We present a review and a new assessment of the Lagrangian dispersion properties of a 2D model of chaotic advection and diffusion in a regular lattice of non stationary kinematic eddies. This model represents an ideal case for which it is possible to analyze the same system from three different perspectives: theory, modelling and experiments. At this regard, we examine absolute and relative Lagrangian dispersion for a kinematic flow, a hydrodynamic model (Delft3D), and a laboratory experiment, in terms of established dynamical system techniques, such as the measure of (Lagrangian) finite-scale Lyapunov exponents (FSLE). The new main results concern: (i) an experimental verification of the scale-dependent dispersion properties of the chaotic advection and diffusion model here considered; (ii) a qualitative and quantitative assessment of the hydro-dynamical Lagrangian simulations. The latter, even though obtained for an idealized open flow configuration, contributes to the overall validation of the computational features of the Delft3D model.
2022
advection; diffusion; hydrodynamics; quantitative analysis; simulation; theoretical study
01 Pubblicazione su rivista::01a Articolo in rivista
Numerical and experimental analysis of Lagrangian dispersion in two-dimensional chaotic flows / La Forgia, Giovanni; Cavaliere, Davide; Espa, Stefania; Falcini, Federico; Lacorata, Guglielmo. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 12:1(2022). [10.1038/s41598-022-11350-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1689240
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