Inverse cascade behavior in freely decaying two-dimensional fluid turbulence

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We present results from an ensemble of 50 runs of two-dimensional hydrodynamic turbulence with spatial resolution of 20482 grid points and from an ensemble of 10 runs with 40962 grid points. All runs in each ensemble have random initial conditions with the same initial integral scale, energy, enstro...

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Detalles Bibliográficos
Autores principales:	Mininni, P.D., Pouquet, A.
Formato:	Artículo publishedVersion
Lenguaje:	Inglés
Publicado:	2013
Materias:	Experimental studies Fluid turbulence Inverse energy cascades Negative fluxes Random initial conditions Source of energy Spatial resolution Two-dimensional hydrodynamics Magnetohydrodynamics Reynolds number Two dimensional Turbulence
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_15393755_v87_n3_p_Mininni
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paperaa:paper_15393755_v87_n3_p_Mininni
record_format	dspace
spelling	paperaa:paper_15393755_v87_n3_p_Mininni2023-06-12T16:50:42Z Inverse cascade behavior in freely decaying two-dimensional fluid turbulence Phys. Rev. E Stat. Nonlinear Soft Matter Phys. 2013;87(3) Mininni, P.D. Pouquet, A. Experimental studies Fluid turbulence Inverse energy cascades Negative fluxes Random initial conditions Source of energy Spatial resolution Two-dimensional hydrodynamics Magnetohydrodynamics Reynolds number Two dimensional Turbulence We present results from an ensemble of 50 runs of two-dimensional hydrodynamic turbulence with spatial resolution of 20482 grid points and from an ensemble of 10 runs with 40962 grid points. All runs in each ensemble have random initial conditions with the same initial integral scale, energy, enstrophy, and Reynolds number. When both ensemble and time averaged, an inverse energy cascade behavior is observed, even in the absence of external mechanical forcing: The energy spectrum at scales larger than the characteristic scale of the flow follows a k-5/3 law, with negative flux, together with a k-3 law at smaller scales, and a positive flux of enstrophy. The source of energy for this behavior comes from the modal energy around the energy-containing scale at t=0. The results shed some light on the connections between decaying and forced turbulence and recent controversies in experimental studies of two-dimensional and magnetohydrodynamic turbulent flows. © 2013 American Physical Society. Fil:Mininni, P.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15393755_v87_n3_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)
language	Inglés
orig_language_str_mv	eng
topic	Experimental studies Fluid turbulence Inverse energy cascades Negative fluxes Random initial conditions Source of energy Spatial resolution Two-dimensional hydrodynamics Magnetohydrodynamics Reynolds number Two dimensional Turbulence
spellingShingle	Experimental studies Fluid turbulence Inverse energy cascades Negative fluxes Random initial conditions Source of energy Spatial resolution Two-dimensional hydrodynamics Magnetohydrodynamics Reynolds number Two dimensional Turbulence Mininni, P.D. Pouquet, A. Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
topic_facet	Experimental studies Fluid turbulence Inverse energy cascades Negative fluxes Random initial conditions Source of energy Spatial resolution Two-dimensional hydrodynamics Magnetohydrodynamics Reynolds number Two dimensional Turbulence
description	We present results from an ensemble of 50 runs of two-dimensional hydrodynamic turbulence with spatial resolution of 20482 grid points and from an ensemble of 10 runs with 40962 grid points. All runs in each ensemble have random initial conditions with the same initial integral scale, energy, enstrophy, and Reynolds number. When both ensemble and time averaged, an inverse energy cascade behavior is observed, even in the absence of external mechanical forcing: The energy spectrum at scales larger than the characteristic scale of the flow follows a k-5/3 law, with negative flux, together with a k-3 law at smaller scales, and a positive flux of enstrophy. The source of energy for this behavior comes from the modal energy around the energy-containing scale at t=0. The results shed some light on the connections between decaying and forced turbulence and recent controversies in experimental studies of two-dimensional and magnetohydrodynamic turbulent flows. © 2013 American Physical Society.
format	Artículo Artículo publishedVersion
author	Mininni, P.D. Pouquet, A.
author_facet	Mininni, P.D. Pouquet, A.
author_sort	Mininni, P.D.
title	Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
title_short	Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
title_full	Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
title_fullStr	Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
title_full_unstemmed	Inverse cascade behavior in freely decaying two-dimensional fluid turbulence
title_sort	inverse cascade behavior in freely decaying two-dimensional fluid turbulence
publishDate	2013
url	http://hdl.handle.net/20.500.12110/paper_15393755_v87_n3_p_Mininni
work_keys_str_mv	AT mininnipd inversecascadebehaviorinfreelydecayingtwodimensionalfluidturbulence AT pouqueta inversecascadebehaviorinfreelydecayingtwodimensionalfluidturbulence
_version_	1769810246294831104

Inverse cascade behavior in freely decaying two-dimensional fluid turbulence

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