Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence

We analyze time series stemming from experiments and direct numerical simulations of hydrodynamic and magnetohydrodynamic turbulence. Simulations are done in periodic boxes, but with a volumetric forcing chosen to mimic the geometry of the flow in the experiments, the von Kármán swirling flow betwee...

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Detalles Bibliográficos
Autores principales: Mininni, Pablo Daniel, Dmitruk, Pablo Ariel
Publicado: 2014
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v89_n5_p_Mininni
http://hdl.handle.net/20.500.12110/paper_15393755_v89_n5_p_Mininni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_15393755_v89_n5_p_Mininni2023-06-08T16:21:00Z Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence Mininni, Pablo Daniel Dmitruk, Pablo Ariel We analyze time series stemming from experiments and direct numerical simulations of hydrodynamic and magnetohydrodynamic turbulence. Simulations are done in periodic boxes, but with a volumetric forcing chosen to mimic the geometry of the flow in the experiments, the von Kármán swirling flow between two counterrotating impellers. Parameters in the simulations are chosen to (within computational limitations) allow comparisons between the experiments and the numerical results. Conducting fluids are considered in all cases. Two different configurations are considered: a case with a weak externally imposed magnetic field and a case with self-sustained magnetic fields. Evidence of long-term memory and 1/f noise is observed in experiments and simulations, in the case with weak magnetic field associated with the hydrodynamic behavior of the shear layer in the von Kármán flow, and in the dynamo case associated with slow magnetohydrodynamic behavior of the large-scale magnetic field. © 2014 American Physical Society. Fil:Mininni, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dmitruk, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v89_n5_p_Mininni http://hdl.handle.net/20.500.12110/paper_15393755_v89_n5_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)
description We analyze time series stemming from experiments and direct numerical simulations of hydrodynamic and magnetohydrodynamic turbulence. Simulations are done in periodic boxes, but with a volumetric forcing chosen to mimic the geometry of the flow in the experiments, the von Kármán swirling flow between two counterrotating impellers. Parameters in the simulations are chosen to (within computational limitations) allow comparisons between the experiments and the numerical results. Conducting fluids are considered in all cases. Two different configurations are considered: a case with a weak externally imposed magnetic field and a case with self-sustained magnetic fields. Evidence of long-term memory and 1/f noise is observed in experiments and simulations, in the case with weak magnetic field associated with the hydrodynamic behavior of the shear layer in the von Kármán flow, and in the dynamo case associated with slow magnetohydrodynamic behavior of the large-scale magnetic field. © 2014 American Physical Society.
author Mininni, Pablo Daniel
Dmitruk, Pablo Ariel
spellingShingle Mininni, Pablo Daniel
Dmitruk, Pablo Ariel
Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
author_facet Mininni, Pablo Daniel
Dmitruk, Pablo Ariel
author_sort Mininni, Pablo Daniel
title Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
title_short Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
title_full Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
title_fullStr Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
title_full_unstemmed Long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
title_sort long-term memory in experiments and numerical simulations of hydrodynamic and magnetohydrodynamic turbulence
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v89_n5_p_Mininni
http://hdl.handle.net/20.500.12110/paper_15393755_v89_n5_p_Mininni
work_keys_str_mv AT mininnipablodaniel longtermmemoryinexperimentsandnumericalsimulationsofhydrodynamicandmagnetohydrodynamicturbulence
AT dmitrukpabloariel longtermmemoryinexperimentsandnumericalsimulationsofhydrodynamicandmagnetohydrodynamicturbulence
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