Helicity cascades in rotating turbulence

The effect of helicity (velocity-vorticity correlations) is studied in direct numerical simulations of rotating turbulence down to Rossby numbers of 0.02. The results suggest that the presence of net helicity plays an important role in the dynamics of the flow. In particular, at small Rossby number,...

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Autores principales: Mininni, P.D., Pouquet, A.
Formato: JOUR
Materias:
Direct numerical simulation
Turbulence
Energy cascades
Helicity
Helicity cascades
Phenomenological interpretations
Rossby numbers
Rotating turbulences
Rotation
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15393755_v79_n2_p_Mininni
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_15393755_v79_n2_p_Mininni2023-10-03T16:22:22Z Helicity cascades in rotating turbulence Mininni, P.D. Pouquet, A. Direct numerical simulation Turbulence Energy cascades Helicity Helicity cascades Phenomenological interpretations Rossby numbers Rotating turbulences Rotation The effect of helicity (velocity-vorticity correlations) is studied in direct numerical simulations of rotating turbulence down to Rossby numbers of 0.02. The results suggest that the presence of net helicity plays an important role in the dynamics of the flow. In particular, at small Rossby number, the energy cascades to large scales, as expected, but helicity then can dominate the cascade to small scales. A phenomenological interpretation in terms of a direct cascade of helicity slowed down by wave-eddy interactions leads to the prediction of non-Kolmogorovian inertial indices for the small-scale energy and helicity spectra. © 2009 The American Physical Society. Fil:Mininni, P.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15393755_v79_n2_p_Mininni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Direct numerical simulation
Turbulence
Energy cascades
Helicity
Helicity cascades
Phenomenological interpretations
Rossby numbers
Rotating turbulences
Rotation
spellingShingle Direct numerical simulation
Turbulence
Energy cascades
Helicity
Helicity cascades
Phenomenological interpretations
Rossby numbers
Rotating turbulences
Rotation
Mininni, P.D.
Pouquet, A.
Helicity cascades in rotating turbulence
topic_facet Direct numerical simulation
Turbulence
Energy cascades
Helicity
Helicity cascades
Phenomenological interpretations
Rossby numbers
Rotating turbulences
Rotation
description The effect of helicity (velocity-vorticity correlations) is studied in direct numerical simulations of rotating turbulence down to Rossby numbers of 0.02. The results suggest that the presence of net helicity plays an important role in the dynamics of the flow. In particular, at small Rossby number, the energy cascades to large scales, as expected, but helicity then can dominate the cascade to small scales. A phenomenological interpretation in terms of a direct cascade of helicity slowed down by wave-eddy interactions leads to the prediction of non-Kolmogorovian inertial indices for the small-scale energy and helicity spectra. © 2009 The American Physical Society.
format JOUR
author Mininni, P.D.
Pouquet, A.
author_facet Mininni, P.D.
Pouquet, A.
author_sort Mininni, P.D.
title Helicity cascades in rotating turbulence
title_short Helicity cascades in rotating turbulence
title_full Helicity cascades in rotating turbulence
title_fullStr Helicity cascades in rotating turbulence
title_full_unstemmed Helicity cascades in rotating turbulence
title_sort helicity cascades in rotating turbulence
url http://hdl.handle.net/20.500.12110/paper_15393755_v79_n2_p_Mininni
work_keys_str_mv AT mininnipd helicitycascadesinrotatingturbulence
AT pouqueta helicitycascadesinrotatingturbulence
_version_ 1782025987840540672

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