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Turbulent Convection Insights from Small-Scale Thermal Forcing with Zero Net Heat Flux at a Horizontal Boundary

Griffiths, Ross; Gayen, Bishakhdatta

Description

A large-scale circulation, a turbulent boundary layer, and a turbulent plume are noted features of convection at large Rayleigh numbers under differential heating on a single horizontal boundary. These might be attributed to the forcing, which in all studies has been limited to a unidirectional gradient over the domain scale. We instead apply forcing on a length scale smaller than the domain, and with variation in both horizontal directions. Direct numerical simulations show turbulence...[Show more]

dc.contributor.authorGriffiths, Ross
dc.contributor.authorGayen, Bishakhdatta
dc.date.accessioned2016-02-24T22:41:32Z
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/1885/98726
dc.description.abstractA large-scale circulation, a turbulent boundary layer, and a turbulent plume are noted features of convection at large Rayleigh numbers under differential heating on a single horizontal boundary. These might be attributed to the forcing, which in all studies has been limited to a unidirectional gradient over the domain scale. We instead apply forcing on a length scale smaller than the domain, and with variation in both horizontal directions. Direct numerical simulations show turbulence throughout the domain, a regime transition to a dominant domain-scale circulation, and a region of logarithmic velocity in the boundary layer, despite zero net heat flux. The results show significant similarities to Rayleigh-Bénard convection, demonstrate the significance of plume merging, support the hypothesis that the key driver of convection is the production of available potential energy without necessarily supplying total potential energy, and imply that contributions to domain-scale circulation in the oceans need not be solely from the large-scale gradients of forcing.
dc.publisherAmerican Physical Society
dc.rightsAuthor/s retain copyright
dc.sourcePhysical Review Letters
dc.titleTurbulent Convection Insights from Small-Scale Thermal Forcing with Zero Net Heat Flux at a Horizontal Boundary
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume115
dc.date.issued2015
local.identifier.absfor040400 - GEOPHYSICS
local.identifier.absfor040500 - OCEANOGRAPHY
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationU3488905xPUB6867
local.type.statusPublished Version
local.contributor.affiliationGriffiths, Ross, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGayen, Bishakhdatta, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue20
local.identifier.doi10.1103/PhysRevLett.115.204301
dc.date.updated2016-02-24T10:12:37Z
local.identifier.scopusID2-s2.0-84948427910
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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