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Abstract:

We study the intermittency properties of the energy and helicity cascades in two 15363 direct numerical simulations of helical rotating turbulence. Symmetric and antisymmetric velocity increments are examinedas well as probability density functions of the velocity field and of the helicity density. It is found that the direct cascade of energy to small scales is scale invariant and nonintermittentwhereas the direct cascade of helicity is highly intermittent. Furthermorethe study of structure functions of different orders allows us to identify a recovery of isotropy of strong events at very small scales in the flow. Finallywe observe the juxtaposition in space of strong laminar and persistent helical columns next to time-varying vortex tanglesthe former being associated with the self-similarity of energy and the latter with the intermittency of helicity. © 2010 American Institute of Physics.

Registro:

Documento: Artículo
Título:Rotating helical turbulence. II. Intermittencyscale invarianceand structures
Autor:Mininni, P.D.; Pouquet, A.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and CONICETCiudad Universitaria, 1428 Buenos Aires, Argentina
Computational and Information Systems Laboratory, NCAR, P.O. Box 3000, Boulder CO 80307-3000, United States
Earth and Sun Systems Laboratory, NCAR, P.O. Box 3000, Boulder CO 80307-3000, United States
Palabras clave:Anti-symmetric; Different order; Helical turbulence; Helicities; Helicity cascades; Intermittency; Rotating turbulence; Scale invariant; Self-similarities; Small scale; Structure functions; Time-varying vortices; Velocity field; Velocity increments; Computer simulation; Rotation; Turbulence; Probability density function
Año:2010
Volumen:22
Número:3
Página de inicio:6
Página de fin:10
DOI: http://dx.doi.org/10.1063/1.3358471
Título revista:Physics of Fluids
Título revista abreviado:Phys. Fluids
ISSN:10706631
CODEN:PHFLE
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_10706631_v22_n3_p6_Mininni.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10706631_v22_n3_p6_Mininni

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Citas:

---------- APA ----------
Mininni, P.D. & Pouquet, A. (2010) . Rotating helical turbulence. II. Intermittencyscale invarianceand structures. Physics of Fluids, 22(3), 6-10.
http://dx.doi.org/10.1063/1.3358471
---------- CHICAGO ----------
Mininni, P.D., Pouquet, A. "Rotating helical turbulence. II. Intermittencyscale invarianceand structures" . Physics of Fluids 22, no. 3 (2010) : 6-10.
http://dx.doi.org/10.1063/1.3358471
---------- MLA ----------
Mininni, P.D., Pouquet, A. "Rotating helical turbulence. II. Intermittencyscale invarianceand structures" . Physics of Fluids, vol. 22, no. 3, 2010, pp. 6-10.
http://dx.doi.org/10.1063/1.3358471
---------- VANCOUVER ----------
Mininni, P.D., Pouquet, A. Rotating helical turbulence. II. Intermittencyscale invarianceand structures. Phys. Fluids. 2010;22(3):6-10.
http://dx.doi.org/10.1063/1.3358471