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dc.contributor.author
Teitelbaum, Tomas
dc.contributor.author
Mininni, Pablo Daniel
dc.date.available
2018-08-31T13:59:33Z
dc.date.issued
2010-12
dc.identifier.citation
Teitelbaum, Tomas; Mininni, Pablo Daniel; Large-scale effects on the decay of rotating helical and non-helical turbulence; IOP Publishing; Physica Scripta; T142; 12-2010; 140031-140039
dc.identifier.issn
0281-1847
dc.identifier.uri
http://hdl.handle.net/11336/57853
dc.description.abstract
Turbulent mixing in geophysics is often affected by the presence of rotation, which renders the flow anisotropic at large scales. Helicity (correlation between the velocity and its curl) has relevance for atmospheric and astrophysical flows and can also affect mixing. In this paper, decaying three-dimensional (3D) turbulence is studied via direct numerical simulations (DNS) for an isotropic non-rotating flow and for rotating flows with and without helicity. We analyze the cases of moderate Rossby number and large Reynolds number, focusing on the behavior of the energy spectrum at large scales and studying its effect on the time evolution of the energy and integral scales for E(k)∼k4 initial conditions. In the non-rotating case, we observe the classical energy decay rate t-10/7 and a growth of the integral length proportional to t2/7 in agreement with the prediction obtained assuming conservation of the Loitsyanski integral. In the presence of rotation we observe a decoupling in the decay of the modes perpendicular to the rotation axis from the remaining 3D modes. These slow modes show a behavior similar to that found in two-dimensional (2D) turbulence, whereas the 3D modes decay as in the isotropic case. We phenomenologically explain the decay considering integral conserved quantities that depend on the large-scale anisotropic spectrum. The decoupling of modes is also observed for a flow with a net amount of helicity. In this case, the 3D modes decay as an isotropic fluid with a constant, constrained integral length and the 2D modes decay as a constrained rotating fluid with maximum helicity. © 2010 The Royal Swedish Academy of Sciences.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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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Helicity
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Decay
dc.subject
Large Scale
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Large-scale effects on the decay of rotating helical and non-helical turbulence
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-08-24T15:31:31Z
dc.journal.volume
T142
dc.journal.pagination
140031-140039
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Teitelbaum, Tomas. Universidad de Buenos Aires; Argentina. 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.description.fil
Fil: Mininni, Pablo Daniel. National Center for Atmospheric Research; Estados Unidos. Universidad de Buenos Aires; Argentina. 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
Physica Scripta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/1402-4896/2010/T142/014003
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0031-8949/2010/T142/014003
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