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dc.contributor.authorHorn, Susanne
dc.contributor.authorSchmid, Peter J.
dc.contributor.authorAurnou, Jonathan M.
dc.date.accessioned2021-11-30T13:39:46Z
dc.date.available2021-11-30T13:39:46Z
dc.date.issued2021-11-26
dc.date.submitted2021-08-01
dc.identifier.citationHorn, S., Schmid, P. J., & Aurnou, J. M. (2021). Unravelling the large-scale circulation modes in turbulent Rayleigh–Bénard convection. EPL (Europhysics Letters). doi:10.1209/0295-5075/ac3da2
dc.identifier.issn0295-5075
dc.identifier.issn1286-4854
dc.identifier.doi10.1209/0295-5075/ac3da2
dc.identifier.urihttp://hdl.handle.net/10754/673845
dc.description.abstractThe large-scale circulation (LSC) is the most fundamental turbulent coherent flow structure in Rayleigh-B\'enard convection. Further, LSCs provide the foundation upon which superstructures, the largest observable features in convective systems, are formed. In confined cylindrical geometries with diameter-to-height aspect ratios of Γ ≅ 1, LSC dynamics are known to be governed by a quasi-two-dimensional, coupled horizontal sloshing and torsional (ST) oscillatory mode. In contrast, in Γ ≥ √2 cylinders, a three-dimensional jump rope vortex (JRV) motion dominates the LSC dynamics. Here, we use dynamic mode decomposition (DMD) on direct numerical simulation data of liquid metal to show that both types of modes co-exist in Γ = 1 and Γ = 2 cylinders but with opposite dynamical importance. Furthermore, with this analysis, we demonstrate that ST oscillations originate from a tilted elliptical mean flow superposed with a symmetric higher order mode, which is connected to the four rolls in the plane perpendicular to the LSC in Γ = 1 tanks.
dc.description.sponsorshipS.H. gratefully acknowledges funding by the EPSRC (grant EP/V047388/1) and J.M.A. by the NSF Geophysics Program (EAR awards 1620649 and 1853196).
dc.publisherIOP Publishing
dc.relation.urlhttps://iopscience.iop.org/article/10.1209/0295-5075/ac3da2
dc.rightsThis is an author-created, un-copyedited version of an article accepted for publication/published in EPL (Europhysics Letters). IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://doi.org/10.1209/0295-5075/ac3da2
dc.titleUnravelling the large-scale circulation modes in turbulent Rayleigh–Bénard convection
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia.
dc.identifier.journalEPL (Europhysics Letters)
dc.rights.embargodate2022-11-26
dc.eprint.versionPost-print
dc.contributor.institutionCentre for Fluid and Complex Systems, Coventry University, Coventry CV1 5FB, UK.
dc.contributor.institutionDepartment of Mathematics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
dc.contributor.institutionDepartment of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095, USA.
kaust.personSchmid, Peter J.
dc.date.accepted2021-11-26
refterms.dateFOA2021-11-30T13:40:50Z


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