Reactive scalars in incompressible turbulence with strongly out of equilibrium chemistry

Wu, Wenwei; Wang, Lipo; Calzavarini (Admin), Enrico; Schmitt, François G

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1017/jfm.2022.164

Titre :

Reactive scalars in incompressible turbulence with strongly out of equilibrium chemistry

Auteur(s) :

Wu, Wenwei [Auteur]

Université du Littoral Côte d'Opale [ULCO]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Wang, Lipo [Auteur]
Calzavarini (Admin), Enrico [Auteur]

Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Unité de Mécanique de Lille - ULR 7512 [UML]
Schmitt, François G [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Titre de la revue :

Journal of Fluid Mechanics

Pagination :

A19

Éditeur :

Cambridge University Press (CUP)

Date de publication :

2022-03-15

ISSN :

0022-1120

Discipline(s) HAL :

Science non linéaire [physics]

Résumé en anglais : [en]

We study the statistical properties of scalar fields undergoing reversible chemical reactions in a turbulent environment by means of numerical simulations. To produce strong chemical fluctuations in a wide region of the ...
Lire la suite >We study the statistical properties of scalar fields undergoing reversible chemical reactions in a turbulent environment by means of numerical simulations. To produce strong chemical fluctuations in a wide region of the domain, an original flow configuration has been proposed, where the species are supplied from buffer boundaries with adjustable thickness, while the flow is developed homogeneous and isotropic turbulence in a periodic domain. With the presence of the mean scalar gradient in the bulk region, the strength of turbulent advection is comparable with the chemical source, which is quantified by the Damköhler number. Our analysis focuses on the global and spatial properties of the reactive scalars in their statistically steady regime. We show how for the case of a second-order reaction such features can be connected to the properties of a non-reactive scalar field advected in the same system. Analytical predictions of the scalar moments in the fast reaction regime agree satisfactorily with the direct numerical simulation results. In comparison with the existing results of the isotropic turbulence case, we conclude that the scalar correlation is jointly determined by both the chemical source and the flow configuration. Moreover, the chemical reaction also plays an important role in determining the scalar energy spectra.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

Unité de Mécanique de Lille (UML) - ULR 7512

Source :

Harvested from HAL

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