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dc.contributor.authorManias, Dimitris M.
dc.contributor.authorTingas, Alexandros
dc.contributor.authorHernandez Perez, Francisco
dc.contributor.authorMalpica Galassi, Riccardo
dc.contributor.authorCiottoli, Pietro P.
dc.contributor.authorValorani, Mauro
dc.contributor.authorIm, Hong G.
dc.date.accessioned2018-12-03T13:16:08Z
dc.date.available2018-12-03T13:16:08Z
dc.date.issued2018-11-30
dc.identifier.citationManias DM, Tingas E-A, Hernández Pérez FE, Malpica Galassi R, Paolo Ciottoli P, et al. (2019) Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index. Combustion and Flame 200: 155–167. Available: http://dx.doi.org/10.1016/j.combustflame.2018.11.023.
dc.identifier.issn0010-2180
dc.identifier.doi10.1016/j.combustflame.2018.11.023
dc.identifier.urihttp://hdl.handle.net/10754/630124
dc.description.abstractTurbulent premixed flames at high Karlovitz numbers exhibit highly complex structures in different reactive scalar fields to the extent that the definition of the flame front in an unambiguous manner is not straightforward. This poses a significant challenge in characterizing the observable turbulent flame behaviour such as the flame surface density, turbulent burning velocity, and so on. Turbulent premixed flames are reactive flows involving physical and chemical processes interacting over a wide range of time scales. By recognizing the multi-scale nature of reactive flows, we analyze the topology and structure of two direct numerical simulation cases of turbulent H2/air premixed flames, in the thin reaction zone and distributed combustion regimes, using tools derived from the computational singular perturbation (CSP) method and augmented by the tangential stretching rate (TSR) analysis. CSP allows to identify the local time scale decomposition of the multi-scale problem in its slow and fast components, while TSR allows to identify the most energetic time scale during both the explosive and dissipative regime of the reactive flow dynamics together with the identification of the flame front in an unambiguous manner. Before facing the complexity of the turbulent flow regime, we carry out a preliminary analysis of a one-dimensional laminar premixed flame in view of highlighting similarities and differences between laminar and turbulent cases. Subsequently, it is shown that the TSR metric provides a reliable way to identify the turbulent flame topologies.
dc.description.sponsorshipThis work was sponsored by competitive research funding from King Abdullah University of Science and Technology (KAUST). MV acknowledges the support of the Italian Ministry of University and Research (MIUR).
dc.publisherElsevier BV
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0010218018305042
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Combustion and Flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Combustion and Flame, [, , (2018-11-30)] DOI: 10.1016/j.combustflame.2018.11.023 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectCSP
dc.subjectTSR
dc.subjectExtreme combustion
dc.subjectTurbulent flames
dc.subjectHigh Karlovitz number
dc.subjectFlame topology
dc.titleInvestigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentComputational Reacting Flow Laboratory (CRFL)
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalCombustion and Flame
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical University, Athens 15773, Greece
dc.contributor.institutionMechanical and Aerospace Engineering Department, Sapienza University, Rome 00184, Italy
kaust.personManias, Dimitris M.
kaust.personTingas, Alexandros
kaust.personHernandez Perez, Francisco
kaust.personIm, Hong G.
refterms.dateFOA2018-12-03T13:20:05Z
dc.date.published-online2018-11-30
dc.date.published-print2019-02


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