dc.contributor.author Er-Raiy, Aimad dc.contributor.author Boukharfane, Radouan dc.contributor.author Parsani, Matteo dc.date.accessioned 2021-02-22T05:42:20Z dc.date.available 2021-02-22T05:42:20Z dc.date.issued 2021-01-04 dc.identifier.citation Er-Raiy, A., Boukharfane, R., & Parsani, M. (2021). Effects of differential diffusion and stratification characteristic length-scale on the propagation of a spherical methane-air flame kernel. AIAA Scitech 2021 Forum. doi:10.2514/6.2021-0680 dc.identifier.isbn 9781624106095 dc.identifier.doi 10.2514/6.2021-0680 dc.identifier.uri http://hdl.handle.net/10754/667537 dc.description.abstract Early flame kernel development and propagation in globally lean stratified fuel--air mixtures is of importance in various practical devices such as internal combustion engines. In this work, three-dimensional direct numerical simulation (DNS) is used to study the influence of the differential diffusion effects in a globally lean methane--air mixtures in presence of mixture heterogeneities with the goal of understanding the flame kernel behavior in such conditions. The DNS typical configuration corresponds to a homogeneous isotropic flow with an expanding spherical flame kernel. The local forced ignition of the kernel is performed by appending as source term in the sensible enthalpy transport equation that emulates spark ignition by energy deposit for a prescribed duration. The combustion chemistry is described with a skeletal methane-air mechanism, which i) features 14 species and 38 reactions, and ii) uses a multicomponent approach to evaluate transport coefficients. To assess the joint effects of differential diffusion and the stratification characteristic length-scale $L_{\Phi}$ on the flame kernel development, we considered cases with constant (unitary) and variable fuel Lewis number, both with different values for $L_{\Phi}$. dc.description.sponsorship The research work was sponsored by King Abdullah University of Science and Technology (KAUST) and made use of the computer clusters at KAUST Supercomputing Laboratory (KSL) and the Supercomputing Laboratory and the Extreme Computing Research Center. The authors also thank Dr. Bilel Hadri at KSL for his technical assistance dc.publisher American Institute of Aeronautics and Astronautics (AIAA) dc.relation.url https://arc.aiaa.org/doi/10.2514/6.2021-0680 dc.rights Archived with thanks to American Institute of Aeronautics and Astronautics dc.title Effects of differential diffusion and stratification characteristic length-scale on the propagation of a spherical methane-air flame kernel dc.type Conference Paper dc.contributor.department Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division dc.contributor.department Applied Mathematics and Computational Science Program dc.contributor.department Extreme Computing Research Center dc.conference.date 19–21 January 2021 dc.conference.name AIAA Scitech 2021 Forum dc.conference.location VIRTUAL EVENT dc.eprint.version Pre-print pubs.publication-status Published kaust.person Er-Raiy, Aimad kaust.person Boukharfane, Radouan kaust.person Parsani, Matteo dc.identifier.eid 2-s2.0-85100316511 refterms.dateFOA 2021-02-22T05:42:20Z kaust.acknowledged.supportUnit computer clusters at KAUST kaust.acknowledged.supportUnit Extreme Computing Research Center. kaust.acknowledged.supportUnit KAUST Supercomputing Laboratory (KSL)
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