October 16, 2021

Pouya Manshour

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Faculty: Faculty of Nano and Biotechnology

Research

Title Interoccurrence time statistics in fully developed turbulence
Type Article
Keywords
Journal Scientific Reports
DOI 10.1038/srep27452
Researchers Pouya Manshour (First researcher) , Mehrnaz Anvari (Second researcher) , Nico Reinke (Third researcher) , Muhammad Sahimi (Fourth researcher) , M. Reza Rahimitabar (Fifth researcher)

Abstract

Emergent extreme events are a key characteristic of complex dynamical systems. The main tool for detailed and deep understanding of their stochastic dynamics is the statistics of time intervals of extreme events. Analyzing extensive experimental data, we demonstrate that for the velocity time series of fully-developed turbulent flows, generated by (i) a regular grid; (ii) a cylinder; (iii) a free jet of helium, and (iv) a free jet of air with the Taylor Reynolds numbers Re_? from 166 to 893, the interoccurrence time distributions P(?) above a positive threshold Q in the inertial range is described by a universal q-exponential function, P(?)=?(2?q)[1??(1?q)?]^{1/(1?q)}, which may be due to the superstatistical nature of the occurrence of extreme events. Our analysis provides a universal description of extreme events in turbulent flows.