On the spreading of non-canonical thermals from direct numerical simulations

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dc.contributor.author Liu, Kai
dc.contributor.author Zgheib, N.
dc.contributor.author Balachandar, S.
dc.date.accessioned 2020-02-27T14:50:38Z
dc.date.available 2020-02-27T14:50:38Z
dc.date.copyright 2020 en_US
dc.date.issued 2020-02-27
dc.identifier.issn 1070-6631 en_US
dc.identifier.uri http://hdl.handle.net/10725/11816
dc.description.abstract We present results from direct numerical simulations on laminar and turbulent non-canonical thermals with an initial rectangular density distribution at a Reynolds number of Re = 500 and Re = 5000, respectively. We find the non-canonical shape to induce strong azimuthal variations in the thermal for both the laminar and turbulent cases. These include noticeable differences in downward and horizontal propagation speeds as well as differences in the strength of the vortex tube. These differences persist over a significant period of time and help generate a cross-flow component that is otherwise not present in canonical cases. The cross-flow component is in the opposite direction to that observed in gravity currents with the same initial density distribution. This is counterintuitive seeing that both flows are solely driven by buoyancy. By extracting the three-dimensional streamlines, we find the descending vortex tube to force the dense fluid to follow a helical path. en_US
dc.language.iso en en_US
dc.title On the spreading of non-canonical thermals from direct numerical simulations 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.description.embargo 12M en_US
dc.relation.journal Physics of Fluids en_US
dc.journal.volume 32 en_US
dc.journal.issue 2 en_US
dc.article.pages 026602-1-14 en_US
dc.identifier.doi https://doi.org/10.1063/1.5138981 en_US
dc.identifier.ctation Liu, K., Zgheib, N., & Balachandar, S. (2020). On the spreading of non-canonical thermals from direct numerical simulations. Physics of Fluids, 32(2), 026602. 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://aip.scitation.org/doi/abs/10.1063/1.5138981 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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