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dc.contributor.author
Feraco, F.
dc.contributor.author
Marino, R.
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Pumir, A.
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Primavera, L.
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Mininni, Pablo Daniel
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Pouquet, A.
dc.contributor.author
Rosenberg, Duane
dc.date.available
2020-02-05T19:33:05Z
dc.date.issued
2018-08
dc.identifier.citation
Feraco, F.; Marino, R.; Pumir, A.; Primavera, L.; Mininni, Pablo Daniel; et al.; Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number; Europhysics Letters; Europhysics Letters; 123; 4; 8-2018; 1-8
dc.identifier.issn
0295-5075
dc.identifier.uri
http://hdl.handle.net/11336/96769
dc.description.abstract
We investigate the large-scale intermittency of vertical velocity and temperature, and the mixing properties of stably stratified turbulent flows using both Lagrangian and Eulerian fields from direct numerical simulations of the Boussinesq equations with periodic boundary conditions, in a parameter space relevant for the atmosphere and the oceans. Over a range of Froude numbers of geophysical interest (≈ 0.05-0.3) we observe very large fluctuations of the vertical components of the velocity and the potential temperature, localized in space and time, with a sharp transition leading to non-Gaussian wings of the probability distribution functions. This behavior is captured by a simple model representing the competition between gravity waves on a fast time scale and nonlinear steepening on a slower time scale. The existence of a resonant regime characterized by enhanced large-scale intermittency, as understood within the framework of the proposed model, is then linked to the emergence of structures in the velocity and potential temperature fields, localized overturning and mixing. Finally, in the same regime we observe a linear scaling of the mixing efficiency with the Froude number and an increase of its value of roughly one order of magnitude.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Europhysics Letters
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
TURBULENCE
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STRATIFICATION
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ATMOSPHERIC FLOWS
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EXTREME EVENTS
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Física de los Fluidos y Plasma
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-10-22T17:59:37Z
dc.journal.volume
123
dc.journal.number
4
dc.journal.pagination
1-8
dc.journal.pais
Reino Unido
dc.description.fil
Fil: Feraco, F.. Université Claude Bernard Lyon 1; Francia. Università della Calabria; Italia. Centre National de la Recherche Scientifique; Francia
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Fil: Marino, R.. Université Claude Bernard Lyon 1; Francia
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Fil: Pumir, A.. Université Claude Bernard Lyon 1; Francia. Centre National de la Recherche Scientifique; Francia. Max Planck Institut für Dynamik und Selbstorganisation Göttingen; Alemania
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Fil: Primavera, L.. Università della Calabria; Italia
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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
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Fil: Pouquet, A.. National Center for Atmospheric Research; Estados Unidos. State University of Colorado at Boulder; Estados Unidos
dc.description.fil
Fil: Rosenberg, Duane. No especifica;
dc.journal.title
Europhysics Letters
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.1209/0295-5075/123/44002
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1209/0295-5075/123/44002
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/arxiv.org/pdf/1806.00342.pdf
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