Anomalous scaling of passive scalars in rotating flows

We present results of direct numerical simulations of passive scalar advection and diffusion in turbulent rotating flows. Scaling laws and the development of anisotropy are studied in spectral space, and in real space using an axisymmetric decomposition of velocity and passive scalar structure funct...

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Autores principales: Rodriguez Imazio, P., Mininni, P.D.
Formato: JOUR
Materias:
Anomalous scaling
Axisymmetric
Intermittency
Passive scalar advection
Passive scalars
Real-space
Rotating flow
Scaling exponent
Second orders
Spectral spaces
Structure functions
Two-dimension
Velocity field
Anisotropy
Rotation
Rotational flow
Scaling laws
Velocity
Probability density function
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15393755_v83_n6_p_RodriguezImazio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15393755_v83_n6_p_RodriguezImazio
record_format dspace
spelling todo:paper_15393755_v83_n6_p_RodriguezImazio2023-10-03T16:22:37Z Anomalous scaling of passive scalars in rotating flows Rodriguez Imazio, P. Mininni, P.D. Anomalous scaling Axisymmetric Intermittency Passive scalar advection Passive scalars Real-space Rotating flow Scaling exponent Second orders Spectral spaces Structure functions Two-dimension Velocity field Anisotropy Rotation Rotational flow Scaling laws Velocity Probability density function We present results of direct numerical simulations of passive scalar advection and diffusion in turbulent rotating flows. Scaling laws and the development of anisotropy are studied in spectral space, and in real space using an axisymmetric decomposition of velocity and passive scalar structure functions. The passive scalar is more anisotropic than the velocity field, and its power spectrum follows a spectral law consistent with ∼k-3/2. This scaling is explained with phenomenological arguments that consider the effect of rotation. Intermittency is characterized using scaling exponents and probability density functions of velocity and passive scalar increments. In the presence of rotation, intermittency in the velocity field decreases more noticeably than in the passive scalar. The scaling exponents show good agreement with Kraichnan's prediction for passive scalar intermittency in two dimensions, after correcting for the observed scaling of the second-order exponent. © 2011 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_v83_n6_p_RodriguezImazio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anomalous scaling
Axisymmetric
Intermittency
Passive scalar advection
Passive scalars
Real-space
Rotating flow
Scaling exponent
Second orders
Spectral spaces
Structure functions
Two-dimension
Velocity field
Anisotropy
Rotation
Rotational flow
Scaling laws
Velocity
Probability density function
spellingShingle Anomalous scaling
Axisymmetric
Intermittency
Passive scalar advection
Passive scalars
Real-space
Rotating flow
Scaling exponent
Second orders
Spectral spaces
Structure functions
Two-dimension
Velocity field
Anisotropy
Rotation
Rotational flow
Scaling laws
Velocity
Probability density function
Rodriguez Imazio, P.
Mininni, P.D.
Anomalous scaling of passive scalars in rotating flows
topic_facet Anomalous scaling
Axisymmetric
Intermittency
Passive scalar advection
Passive scalars
Real-space
Rotating flow
Scaling exponent
Second orders
Spectral spaces
Structure functions
Two-dimension
Velocity field
Anisotropy
Rotation
Rotational flow
Scaling laws
Velocity
Probability density function
description We present results of direct numerical simulations of passive scalar advection and diffusion in turbulent rotating flows. Scaling laws and the development of anisotropy are studied in spectral space, and in real space using an axisymmetric decomposition of velocity and passive scalar structure functions. The passive scalar is more anisotropic than the velocity field, and its power spectrum follows a spectral law consistent with ∼k-3/2. This scaling is explained with phenomenological arguments that consider the effect of rotation. Intermittency is characterized using scaling exponents and probability density functions of velocity and passive scalar increments. In the presence of rotation, intermittency in the velocity field decreases more noticeably than in the passive scalar. The scaling exponents show good agreement with Kraichnan's prediction for passive scalar intermittency in two dimensions, after correcting for the observed scaling of the second-order exponent. © 2011 American Physical Society.
format JOUR
author Rodriguez Imazio, P.
Mininni, P.D.
author_facet Rodriguez Imazio, P.
Mininni, P.D.
author_sort Rodriguez Imazio, P.
title Anomalous scaling of passive scalars in rotating flows
title_short Anomalous scaling of passive scalars in rotating flows
title_full Anomalous scaling of passive scalars in rotating flows
title_fullStr Anomalous scaling of passive scalars in rotating flows
title_full_unstemmed Anomalous scaling of passive scalars in rotating flows
title_sort anomalous scaling of passive scalars in rotating flows
url http://hdl.handle.net/20.500.12110/paper_15393755_v83_n6_p_RodriguezImazio
work_keys_str_mv AT rodriguezimaziop anomalousscalingofpassivescalarsinrotatingflows
AT mininnipd anomalousscalingofpassivescalarsinrotatingflows
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