Effect of velocity boundary conditions on the heat transfer and flow topology in two-dimensional Rayleigh-Bénard convection

dc.contributor.authorVan Der Poel, Erwin P.
dc.contributor.authorOstilla-Mónico, Rodolfo
dc.contributor.authorVerzicco, Roberto
dc.contributor.authorLohse, Detlef
dc.date.accessioned2019-07-17T18:27:03Z
dc.date.available2019-07-17T18:27:03Z
dc.date.issued2014-07
dc.description.abstractThe effect of various velocity boundary condition is studied in two-dimensional Rayleigh-Bénard convection. Combinations of no-slip, stress-free, and periodic boundary conditions are used on both the sidewalls and the horizontal plates. For the studied Rayleigh numbers Ra between 10^8 and 10^11 the heat transport is lower for ?=0.33 than for ?=1in case of no-slip sidewalls. This is, surprisingly, the opposite for stress-free sidewalls, where the heat transport increases for a lower aspect ratio. In wider cells the aspect-ratio dependence is observed to disappear for Ra?10^10. Two distinct flow types with very different dynamics can be seen, mostly dependent on the plate velocity boundary condition, namely roll-like flow and zonal flow, which have a substantial effect on the dynamics and heat transport in the system. The predominantly horizontal zonal flow suppresses heat flux and is observed for stress-free and asymmetric plates. Low aspect-ratio periodic sidewall simulations with a no-slip boundary condition on the plates also exhibit zonal flow. In all the other cases, the flow is roll like. In two-dimensional Rayleigh-Bénard convection, the velocity boundary conditions thus have large implications on both roll-like and zonal flow that have to be taken into consideration before the boundary conditions are imposed.
dc.identifier10.1103/PhysRevE.90.013017
dc.identifier.citationCopyright 2014 Physical Review E. Recommended citation: van der Poel, Erwin P., Rodolfo Ostilla-Mónico, Roberto Verzicco, and Detlef Lohse. "Effect of velocity boundary conditions on the heat transfer and flow topology in two-dimensional Rayleigh-Bénard convection." Physical Review E 90, no. 1 (2014): 013017. doi:10.1103/PhysRevE.90.013017. URL: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.90.013017. Reproduced in accordance with the original publisher's licensing terms and with permission from the authors.
dc.identifier.urihttps://hdl.handle.net/10657/4139
dc.language.isoen_US
dc.publisherPhysical Review E
dc.titleEffect of velocity boundary conditions on the heat transfer and flow topology in two-dimensional Rayleigh-Bénard convection
dc.typeArticle

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