Characterizing most irregular small-scale structures in turbulence using local Hölder exponents

Autor:	Florian Nguyen, Jean-Philippe Laval, Bérengère Dubrulle
Rok vydání:	2020
Předmět:	Physics Scale (ratio) Turbulence media_common.quotation_subject Scalar (physics) 01 natural sciences Asymmetry Domain (mathematical analysis) 010305 fluids & plasmas Vortex 0103 physical sciences Burgers vortex Statistical physics 010306 general physics Topology (chemistry) media_common
Zdroj:	Physical Review E. 102
ISSN:	2470-0053 2470-0045
DOI:	10.1103/physreve.102.063105
Popis:	Two scalar fields characterizing respectively pseudo-H\"older exponents and local energy transfers are used to capture the topology and the dynamics of the velocity fields in areas of lesser regularity. The present analysis is conducted using velocity fields from two direct numerical simulations of the Navier-Stokes equations in a triply periodic domain. A typical irregular structure is obtained by averaging over the 213 most irregular events. Such structure is similar to a Burgers vortex, with nonaxisymmetric corrections. A possible explanation for such asymmetry is provided by a detailed time-resolved analysis of birth and death of the irregular structures, which shows that they are connected to vortex interactions, possibly vortex reconnection.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::621779eaaf0ad1cefbd72a708b140c86 https://doi.org/10.1103/physreve.102.063105 Zobrazit plný text záznamu