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dc.contributor.authorRouhi, A
dc.contributor.authorLohse, D
dc.contributor.authorMarusic, I
dc.contributor.authorSun, C
dc.contributor.authorChung, D
dc.date.accessioned2021-01-19T22:48:50Z
dc.date.available2021-01-19T22:48:50Z
dc.date.issued2021-03-10
dc.identifier.citationRouhi, A., Lohse, D., Marusic, I., Sun, C. & Chung, D. (2021). Coriolis effect on centrifugal buoyancy-driven convection in a thin cylindrical shell. Journal of Fluid Mechanics, 910, https://doi.org/10.1017/jfm.2020.959.
dc.identifier.issn0022-1120
dc.identifier.urihttp://hdl.handle.net/11343/258757
dc.description.abstractWe study the effect of the Coriolis force on centrifugal buoyancy-driven convection in a rotating cylindrical shell with inner cold wall and outer hot wall. This is done by performing direct numerical simulations for increasing inverse Rossby number Ro−1 from zero (no Coriolis force) to 20 (very large Coriolis force) and for Rayleigh number Ra from 107 to 1010 and Prandtl number Pr=0.7, corresponding to air. We invoke the thin-shell limit, which neglects the curvature and radial variations of the centripetal acceleration. As Ro−1 increases from zero, the system forms an azimuthal bidirectional wind that reaches its maximum momentum at an optimal Ro−1opt, associated with a maximal skin-friction coefficient Cf and a minimal Nusselt number Nu. Just beyond Ro−1opt, the wind weakens and an axial, quasi-two-dimensional cyclone, corotating with the system, begins to form. A local ‘turbulence’ inverse Rossby number (non-dimensionalised by the eddy turnover time) determines the onset of cyclone formation for all Ra, when its value reaches approximately 4. At Ro−1≫Ro−1opt, the system falls into the geostrophic regime with a sudden drop in Nu. The bidirectional wind for Ro−1≤Ro−1opt is a feature of this system, as it hastens the boundary layer transition from laminar to turbulent, towards the ultimate regime. We see the onset of this transition at Ra=1010 and Ro−1≃Ro−1opt, although the mean flow profile has not yet fully collapsed on the Prandtl–von Kármán (logarithmic) law.
dc.languageen
dc.publisherCambridge University Press (CUP)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0
dc.titleCoriolis effect on centrifugal buoyancy-driven convection in a thin cylindrical shell
dc.typeJournal Article
dc.identifier.doi10.1017/jfm.2020.959
melbourne.affiliation.departmentMechanical Engineering
melbourne.source.titleJournal of Fluid Mechanics
melbourne.source.volume910
melbourne.source.pagesa32-
dc.rights.licenseCC BY
melbourne.elementsid1489433
melbourne.openaccess.urlhttps://doi.org/10.1017/jfm.2020.959
melbourne.openaccess.statusPublished version
melbourne.contributor.authorRouhi, Amirreza
melbourne.contributor.authorMarusic, Ivan
melbourne.contributor.authorChung, Daniel
dc.identifier.eissn1469-7645
melbourne.accessrightsOpen Access


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