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dc.contributor.authorShen, Hua
dc.contributor.authorParsani, Matteo
dc.date.accessioned2017-02-12T12:50:28Z
dc.date.available2017-02-12T12:50:28Z
dc.date.issued2017-01-20
dc.identifier.citationShen H, Parsani M (2017) The role of multidimensional instabilities in direct initiation of gaseous detonations in free space. Journal of Fluid Mechanics 813. Available: http://dx.doi.org/10.1017/jfm.2017.5.
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2017.5
dc.identifier.urihttp://hdl.handle.net/10754/622868
dc.description.abstractWe numerically investigate the direct initiation of detonations driven by the propagation of a blast wave into a unconfined gaseous combustible mixture to study the role played by multidimensional instabilities in direct initiation of stable and unstable detonations. To this end, we first model the dynamics of unsteady propagation of detonation using the one-dimensional compressible Euler equations with a one-step chemical reaction model and cylindrical geometrical source terms. Subsequently, we use two-dimensional compressible Euler equations with just the chemical reaction source term to directly model cylindrical detonations. The one-dimensional results suggest that there are three regimes in the direct initiation for stable detonations, that the critical energy for mildly unstable detonations is not unique, and that highly unstable detonations are not self-sustainable. These phenomena agree well with one-dimensional theories and computations available in the literature. However, our two-dimensional results indicate that one-dimensional approaches are valid only for stable detonations. In mildly and highly unstable detonations, one-dimensional approaches break down because they cannot take the effects and interactions of multidimensional instabilities into account. In fact, instabilities generated in multidimensional settings yield the formation of strong transverse waves that, on one hand, increase the risk of failure of the detonation and, on the other hand, lead to the initiation of local over-driven detonations that enhance the overall self-sustainability of the global process. The competition between these two possible outcomes plays an important role in the direct initiation of detonations.
dc.description.sponsorshipResearch reported in this paper was funded by King Abdullah University of Science and Technology. We are grateful for the computing resources of the Supercomputing Laboratory and the Extreme Computing Research Center at King Abdullah University of Science and Technology.
dc.publisherCambridge University Press (CUP)
dc.relation.urlhttps://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/div-classtitlethe-role-of-multidimensional-instabilities-in-direct-initiation-of-gaseous-detonations-in-free-spacediv/6B1BE788F8E45D540361C5E124C3B66C
dc.rightsArchived with thanks to Journal of Fluid Mechanics
dc.subjectdetonations
dc.subjectreacting flows
dc.subjectshock waves
dc.titleThe role of multidimensional instabilities in direct initiation of gaseous detonations in free space
dc.typeArticle
dc.contributor.departmentApplied Mathematics and Computational Science Program
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentExtreme Computing Research Center
dc.identifier.journalJournal of Fluid Mechanics
dc.eprint.versionPost-print
kaust.personShen, Hua
kaust.personParsani, Matteo
refterms.dateFOA2017-07-20T00:00:00Z
dc.date.published-online2017-01-20
dc.date.published-print2017-02


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