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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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v83_n6_p_RodriguezImazio http://hdl.handle.net/20.500.12110/paper_15393755_v83_n6_p_RodriguezImazio |
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paper:paper_15393755_v83_n6_p_RodriguezImazio2023-06-08T16:20:50Z Anomalous scaling of passive scalars in rotating flows Mininni, Pablo Daniel 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v83_n6_p_RodriguezImazio 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 Mininni, Pablo Daniel 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. |
author |
Mininni, Pablo Daniel |
author_facet |
Mininni, Pablo Daniel |
author_sort |
Mininni, Pablo Daniel |
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 |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v83_n6_p_RodriguezImazio http://hdl.handle.net/20.500.12110/paper_15393755_v83_n6_p_RodriguezImazio |
work_keys_str_mv |
AT mininnipablodaniel anomalousscalingofpassivescalarsinrotatingflows |
_version_ |
1768542857220587520 |