Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame

The local volumetric dilatation rate, namely, the rate of change of an infinitesimal fluid volume per unit volume, [fórmula], is an important variable particularly in flows with heat release. Its tangential and normal strain rate components,[fórmula] and [fórmula] , respectively, account for stretch...

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Authors: Cifuentes, L., Dopazo, C., Martín, J., Domingo, P., Vervisch, L.
Format: article
Status:Published version
Publication Date:2015
Country:España
Institution:Universidad de Zaragoza
Repository:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:165018
Online Access:http://zaguan.unizar.es/record/165018
Access Level:Open access
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spelling Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flameCifuentes, L.Dopazo, C.Martín, J.Domingo, P.Vervisch, L.The local volumetric dilatation rate, namely, the rate of change of an infinitesimal fluid volume per unit volume, [fórmula], is an important variable particularly in flows with heat release. Its tangential and normal strain rate components,[fórmula] and [fórmula] , respectively, account for stretching and partially for separation of iso-scalar surfaces. A three-dimensional direct numerical simulation (DNS) of a turbulent premixed methane–air flame in a piloted Bunsen burner configuration has been performed by solving the full conservation equations for mass, momentum, energy and chemical species using tabulated chemistry. Results for the volumetric dilatation rate as a function of the iso-scalar surface geometry, characterized by the mean and Gauss curvatures, [fórmula] and [fórmula] , are obtained in several zones (reactants, preheat, reacting and products) of the computational domain. Flat iso-scalar surfaces are the most likely geometries in agreement with previous DNS. The relationship between density and a reaction progress variable, under a low Mach number flamelet assumption, leads to an expression for [fórmula] with contributions from progress variable source and molecular diffusion budget, with a significant contribution from the latter; this approximate expression for the volumetric dilatation rate is studied with DNS results. The joint pdf of [fórmula] and[fórmula] confirms that the line [fórmula] separates mostly expansive flow regions from compressive zones.2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/165018reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1650182026-05-29T13:59:51Z
dc.title.none.fl_str_mv Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
title Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
spellingShingle Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
Cifuentes, L.
title_short Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
title_full Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
title_fullStr Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
title_full_unstemmed Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
title_sort Local volumetric dilatation rate and scalar geometries in a premixed methane-air turbulent jet flame
dc.creator.none.fl_str_mv Cifuentes, L.
Dopazo, C.
Martín, J.
Domingo, P.
Vervisch, L.
author Cifuentes, L.
author_facet Cifuentes, L.
Dopazo, C.
Martín, J.
Domingo, P.
Vervisch, L.
author_role author
author2 Dopazo, C.
Martín, J.
Domingo, P.
Vervisch, L.
author2_role author
author
author
author
description The local volumetric dilatation rate, namely, the rate of change of an infinitesimal fluid volume per unit volume, [fórmula], is an important variable particularly in flows with heat release. Its tangential and normal strain rate components,[fórmula] and [fórmula] , respectively, account for stretching and partially for separation of iso-scalar surfaces. A three-dimensional direct numerical simulation (DNS) of a turbulent premixed methane–air flame in a piloted Bunsen burner configuration has been performed by solving the full conservation equations for mass, momentum, energy and chemical species using tabulated chemistry. Results for the volumetric dilatation rate as a function of the iso-scalar surface geometry, characterized by the mean and Gauss curvatures, [fórmula] and [fórmula] , are obtained in several zones (reactants, preheat, reacting and products) of the computational domain. Flat iso-scalar surfaces are the most likely geometries in agreement with previous DNS. The relationship between density and a reaction progress variable, under a low Mach number flamelet assumption, leads to an expression for [fórmula] with contributions from progress variable source and molecular diffusion budget, with a significant contribution from the latter; this approximate expression for the volumetric dilatation rate is studied with DNS results. The joint pdf of [fórmula] and[fórmula] confirms that the line [fórmula] separates mostly expansive flow regions from compressive zones.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/165018
url http://zaguan.unizar.es/record/165018
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv
publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
repository.name.fl_str_mv
repository.mail.fl_str_mv
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