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A-Priori Validation of Scalar Dissipation Rate Models for Turbulent Non-Premixed Flames

Published version
Peer-reviewed

Type

Article

Change log

Authors

Abstract

jats:titleAbstract</jats:title>jats:pThe modelling of scalar dissipation rate in conditional methods for large-eddy simulations is investigated based on a priori direct numerical simulation analysis using a dataset representing an igniting non-premixed planar jet flame. The main objective is to provide a comprehensive assessment of models typically used for large-eddy simulations of non-premixed turbulent flames with the Conditional Moment Closure combustion model. The linear relaxation model gives a good estimate of the Favre-filtered scalar dissipation rate throughout the ignition with a value of the related constant close to the one deduced from theoretical arguments. Such value of the constant is one order of magnitude higher than typical values used in Reynolds-averaged approaches. The amplitude mapping closure model provides a satisfactory estimate of the conditionally filtered scalar dissipation rate even in flows characterised by shear driven turbulence and strong density variation.</jats:p>

Description

Keywords

Scalar dissipation rate, Large-eddy simulation, Conditional moment closure, Non-premixed flames

Journal Title

Flow, Turbulence and Combustion

Conference Name

Journal ISSN

1386-6184
1573-1987

Volume Title

107

Publisher

Springer Science and Business Media LLC
Sponsorship
Engineering and Physical Sciences Research Council (EP/K025791/1)
Engineering and Physical Sciences Research Council (EP/R029369/1)