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dc.contributor.author
Rosenberg, Duane
dc.contributor.author
Pouquet, Annick
dc.contributor.author
Marino, R.
dc.contributor.author
Mininni, Pablo Daniel
dc.date.available
2018-05-09T19:02:09Z
dc.date.issued
2015-05
dc.identifier.citation
Rosenberg, Duane; Pouquet, Annick; Marino, R.; Mininni, Pablo Daniel; Evidence for Bolgiano-Obukhov scaling in rotating stratified turbulence using high-resolution direct numerical simulations; American Institute of Physics; Physics of Fluids; 27; 5; 5-2015; 1-24; 55105
dc.identifier.issn
1070-6631
dc.identifier.uri
http://hdl.handle.net/11336/44669
dc.description.abstract
We report results on rotating stratified turbulence in the absence of forcing and with large-scale isotropic initial conditions using direct numerical simulations computed on grids of up to 40963 points. The Reynolds and Froude numbers are, respectively, equal to Re = 5.4 × 104 and Fr = 0.0242. The ratio of the Brunt-Väisälä to the inertial wave frequency, N/ f , is taken to be equal to 4.95, a choice appropriate to model the dynamics of the southern abyssal ocean at mid latitudes. This gives a global buoyancy Reynolds number RB = ReFr2 ≈ 32, a value sufficient for some isotropy to be recovered in the small scales beyond the Ozmidov scale, but still moderate enough that the intermediate scales where waves are prevalent are well resolved. We concentrate on the large-scale dynamics, for which we find a spectrum compatible with the Bolgiano-Obukhov scaling. This scaling is also found for geostrophically balanced initial conditions on a run at a lower resolution and hence lower RB ≈ 4. Furthermore, we confirm that the Froude number based on a typical vertical length scale is of order unity, with strong gradients in the vertical. Two characteristic scales emerge from this computation and are identified from sharp variations in the spectral distribution of either total energy or helicity. A spectral break is also observed at a scale at which the partition of energy between the kinetic and potential modes changes abruptly, and beyond which a Kolmogorov-like spectrum recovers. Large slanted layers are ubiquitous in the flow, in the velocity and temperature fields, with local overturning events indicated by small local Richardson numbers and strong localized vortex tangles . Finally, a small large-scale enhancement of energy directly attributable to the effect of rotation is also observed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Institute of Physics
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Rotating Flows
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Stratified Flows
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Abyssal Ocean
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Turbulence
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Evidence for Bolgiano-Obukhov scaling in rotating stratified turbulence using high-resolution direct numerical simulations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-04-27T18:50:35Z
dc.journal.volume
27
dc.journal.number
5
dc.journal.pagination
1-24; 55105
dc.journal.pais
Estados Unidos
dc.journal.ciudad
New York
dc.description.fil
Fil: Rosenberg, Duane. National Center for Computational Sciences; Estados Unidos
dc.description.fil
Fil: Pouquet, Annick. Laboratory for Atmospheric and Space Physics; Estados Unidos
dc.description.fil
Fil: Marino, R.. National Center for Atmospheric Research; Estados Unidos. University of California; Estados Unidos. Consiglio Nazionale delle Ricerche; Italia
dc.description.fil
Fil: Mininni, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
dc.journal.title
Physics of Fluids
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://scitation.aip.org/content/aip/journal/pof2/27/5/10.1063/1.4921076
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1063/1.4921076
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