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dc.contributor.authorLangella, Ivanen
dc.contributor.authorSwaminathan, Swamien
dc.date.accessioned2016-01-13T11:37:47Z
dc.date.available2016-01-13T11:37:47Z
dc.date.issued2016-03-01en
dc.identifier.citationCombustion Theory and Modelling 2016.en
dc.identifier.issn1364-7830
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/253205
dc.description.abstractThe unstrained and strained flamelet closures for filtered reaction rate in large eddy simulation (LES) of premixed flames are studied. The required sub-grid scale (SGS) PDF in these closures is presumed using the Beta function. The relative performances of these closures are assessed by comparing numerical results from large eddy simulations of piloted Bunsen flames of stoichiometric methane–air mixture with experimental measurements. The strained flamelets closure is observed to underestimate the burn rate and thus the reactive scalars mass fractions are under-predicted with an over-prediction of fuel mass fraction compared with the unstrained flamelet closure. The physical reasons for this relative behaviour are discussed. The results of unstrained flamelet closure compare well with experimental data. The SGS variance of the progress variable required for the presumed PDF is obtained by solving its transport equation. An order of magnitude analysis of this equation suggests that the commonly used algebraic model obtained by balancing source and sink in this transport equation does not hold. This algebraic model is shown to underestimate the SGS variance substantially and the implications of this variance model for the filtered reaction rate closures are highlighted.
dc.description.sponsorshipThe authors express their gratitude to EPSRC, Siemens and Rolls-Royce for their support. This work is funded by the grant numbered EP/I027556/1.
dc.languageEnglishen
dc.language.isoenen
dc.publisherTaylor & Francis
dc.rightsAttribution 4.0 International
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectSGS varianceen
dc.subjectdynamic modelen
dc.subjectSDRen
dc.titleUnstrained and strained flamelets for LES of premixed combustionen
dc.typeArticle
dc.description.versionThis is the final version of the article. It first appeared from Taylor & Francis via https://doi.org/10.1080/13647830.2016.1140230en
prism.endingPage440
prism.publicationDate2016en
prism.publicationNameCombustion Theory and Modellingen
prism.startingPage410
prism.volume20en
dc.rioxxterms.funderEPSRC
dc.rioxxterms.projectidEP/I027556/1
rioxxterms.versionofrecord10.1080/13647830.2016.1140230en
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2016-03-01en
dc.contributor.orcidLangella, Ivan [0000-0002-2884-9749]
dc.contributor.orcidSwaminathan, Swami [0000-0003-3338-0698]
dc.identifier.eissn1741-3559
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/I027556/1)
cam.orpheus.successThu Jan 30 12:55:26 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International