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Rotating horizontal convection in a rectangular box

Vreugdenhil, Catherine; Griffiths, Ross; Gayen, Bishakhdatta

Description

We examine the effect of rotation on horizontal convection using laboratory experiments in a rectangular box domain. Horizontal convection is a basic model for the meridional overturning circulation (MOC) in the ocean; we also expect the MOC is influenced by the Earth's rotation. The Rayleigh number is two orders of magnitude larger than any previous study (Ra ~ 1012) to ensure the flow lies in a regime with a turbulent boundary layer and endwall plume (to better match realistic ocean...[Show more]

dc.contributor.authorVreugdenhil, Catherine
dc.contributor.authorGriffiths, Ross
dc.contributor.authorGayen, Bishakhdatta
dc.coverage.spatialMelbourne
dc.date.accessioned2018-11-30T01:19:30Z
dc.date.available2018-11-30T01:19:30Z
dc.date.createdDecember 8-11 2014
dc.identifier.isbn9780646596952
dc.identifier.urihttp://hdl.handle.net/1885/154091
dc.description.abstractWe examine the effect of rotation on horizontal convection using laboratory experiments in a rectangular box domain. Horizontal convection is a basic model for the meridional overturning circulation (MOC) in the ocean; we also expect the MOC is influenced by the Earth's rotation. The Rayleigh number is two orders of magnitude larger than any previous study (Ra ~ 1012) to ensure the flow lies in a regime with a turbulent boundary layer and endwall plume (to better match realistic ocean conditions). Other governing parameters are the Prandtl number Pr ~ 5, aspect ratios AH = 0.16 and AW = 0.24, and Rossby number Ro ~ 0.001-0.1. Particle tracking velocimetry is used to measure horizontal velocity fields at three interior depths, away from the boundary layer that forms adjacent to the thermal forcing. With increasing rotation, the steady state time-averaged flow dynamics changes from a full length cyclonic gyre, to a series of five counter-rotating baroclinic eddies (at non-dimensional Rossby deformation scale of O(1)) and then to a large anticyclonic gyre. The large scale horizontal flow dynamics are largely independent of depth. The divergence and vorticity of the horizontal velocity fields are used to estimate the overturning, which consistently decreases with increases in rotation. Direct Numerical Simulations are ongoing, and will allow access to the energetics of this complicated system.
dc.format.mimetypeapplication/pdf
dc.publisherAustralasian Fluid Mechanics Society
dc.relation.ispartofseries19th Australasian Fluid Mechanics Conference AFMC 2014
dc.sourceProceedings of the 19th Australasian Fluid Mechanics Conference
dc.titleRotating horizontal convection in a rectangular box
dc.typeConference paper
local.description.notesImported from ARIES
local.description.refereedYes
dc.date.issued2014
local.identifier.absfor040400 - GEOPHYSICS
local.identifier.absfor040500 - OCEANOGRAPHY
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationU3488905xPUB18666
local.type.statusPublished Version
local.contributor.affiliationVreugdenhil, Catherine, College of Science, ANU
local.contributor.affiliationGriffiths, Ross, College of Science, ANU
local.contributor.affiliationGayen, Bishakhdatta, College of Science, ANU
dc.date.updated2018-11-29T08:21:10Z
local.identifier.scopusID2-s2.0-84959156583
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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