Multi-particle dispersion in fully developed turbulence

Creators: Biferale, L.; Boffetta, G.; Celani, A.; Devenish, B.; Lanotte, A.; Toschi, F.

Others:: Department of Physics (INFN) ; Istituto Nazionale di Fisica Nucleare (INFN)-Università degli Studi di Roma Tor Vergata [Roma]; Dipartimento di Fisica Generale [Torino] ; Università degli studi di Torino = University of Turin (UNITO); Istituto di Scienze dell'Atmosfera e Del Clima [Torino] (isac) ; Consiglio Nazionale delle Ricerche (CNR); Institut Non Linéaire de Nice Sophia-Antipolis (INLN) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS); Istituto di Scienze dell'Atmosfera e del Clima [Lecce] (ISAC) ; Consiglio Nazionale delle Ricerche [Roma] (CNR); Istituto per le Applicazioni del Calcolo "Mauro Picone" (IAC) ; Consiglio Nazionale delle Ricerche [Roma] (CNR)

Description

The statistical geometry of dispersing Lagrangian clusters of four particles (tetrahedra) is studied by means of high-resolution direct numerical simulations of three-dimensional homogeneous isotropic turbulence. We give the first evidence of a self-similar regime of shape dynamics characterized by almost two-dimensional, strongly elongated geometries. The analysis of four-point velocity-difference statistics and orientation shows that inertial-range eddies typically generate a straining field with a strong extensional component aligned with the elongation direction and weak extensional/compressional components in the orthogonal plane.

Abstract

4 pages, 5 figures

Multi-particle dispersion in fully developed turbulence

Description

Abstract

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