Dynamics of non-circular finite-release gravity currents

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dc.contributor.author Zgheib, N.
dc.contributor.author Bonometti, T.
dc.contributor.author Balachandar, S.
dc.date.accessioned 2019-11-18T11:03:45Z
dc.date.available 2019-11-18T11:03:45Z
dc.date.copyright 2015 en_US
dc.date.issued 2019-11-18
dc.identifier.issn 1469-7645 en_US
dc.identifier.uri http://hdl.handle.net/10725/11537
dc.description.abstract The present work reports some new aspects of non-axisymmetric gravity currents obtained from laboratory experiments, fully resolved simulations and box models. Following the earlier work of Zgheib et al. (Theor. Comput. Fluid Dyn., vol. 28, 2014, pp. 521–529) which demonstrated that gravity currents initiating from non-axisymmetric cross-sectional geometries do not become axisymmetric, nor do they retain their initial shape during the slumping and inertial phases of spreading, we show that such non-axisymmetric currents eventually reach a self-similar regime during which (i) the local front propagation scales as as in circular releases and (ii) the non-axisymmetric front has a self-similar shape that primarily depends on the aspect ratio of the initial release. Complementary experiments of non-Boussinesq currents and top-spreading currents suggest that this self-similar dynamics is independent of the density ratio, vertical aspect ratio, wall friction and Reynolds number , provided the last is large, i.e. . The local instantaneous front Froude number obtained from the fully resolved simulations is compared to existing models of Froude functions. The recently reported extended box model is capable of capturing the dynamics of such non-axisymmetric flows. Here we use the extended box model to propose a relation for the self-similar horizontal aspect ratio of the propagating front as a function of the initial horizontal aspect ratio , namely . The experimental and numerical results are in good agreement with the proposed relation. en_US
dc.language.iso en en_US
dc.title Dynamics of non-circular finite-release gravity currents en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201706684 en_US
dc.author.department Industrial And Mechanical Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Journal of Fluid Mechanics en_US
dc.journal.volume 783 en_US
dc.article.pages 344-378 en_US
dc.identifier.doi https://doi.org/10.1017/jfm.2015.580 en_US
dc.identifier.ctation Zgheib, N., Bonometti, T., & Balachandar, S. (2015). Dynamics of non-circular finite-release gravity currents. Journal of Fluid Mechanics, 783, 344-378. en_US
dc.author.email nadim.zgheib@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/dynamics-of-noncircular-finiterelease-gravity-currents/7C1606CE40433B4722112A27BA0E73B4 en_US
dc.orcid.id https://orcid.org/0000-0002-1032-8005 en_US
dc.author.affiliation Lebanese American University en_US

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