The effect of subfilter-scale physics on regularization models

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The subfilter-scale (SFS) physics of regularization models are investigated to understand the regularizations’ performance as SFS models. The strong suppression of spectrally local SFS interactions and the conservation of small-scale circulation in the Lagrangianaveraged Navier-Stokes α−model (LANS−...

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Autor principal:	Mininni, Pablo Daniel
Publicado:	2011
Materias:	Alpha models Intermittency LES MHD Subgrid-scale processes
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13824309_v16_n_p411_Graham http://hdl.handle.net/20.500.12110/paper_13824309_v16_n_p411_Graham
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_13824309_v16_n_p411_Graham
record_format	dspace
spelling	paper:paper_13824309_v16_n_p411_Graham2023-06-08T16:12:26Z The effect of subfilter-scale physics on regularization models Mininni, Pablo Daniel Alpha models Intermittency LES MHD Subgrid-scale processes The subfilter-scale (SFS) physics of regularization models are investigated to understand the regularizations’ performance as SFS models. The strong suppression of spectrally local SFS interactions and the conservation of small-scale circulation in the Lagrangianaveraged Navier-Stokes α−model (LANS−α) is found to lead to the formation of rigid bodies. These contaminate the superfilter-scale energy spectrum with a scaling that approaches k+1 as the SFS spectra is resolved. The Clark−α and Leray−α models, truncations of LANS−α, do not conserve small-scale circulation and do not develop rigid bodies. LANS−α, however, is closest to Navier-Stokes in intermittency properties. For magnetohydrodynamics (MHD), the presence of the Lorentz force as a source (or sink) for circulation and as a facilitator of both spectrally nonlocal large to small scale interactions as well as local SFS interactions prevents the formation of rigid bodies in Lagrangian-averaged MHD (LAMHD−α). We find LAMHD−α performs well as a predictor of superfilter-scale energy spectra and of intermittent current sheets at high Reynolds numbers.We expect it may prove to be a generally applicable MHD-LES. © Springer Science+Business Media B.V. 2011. Fil:Mininni, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13824309_v16_n_p411_Graham http://hdl.handle.net/20.500.12110/paper_13824309_v16_n_p411_Graham
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Alpha models Intermittency LES MHD Subgrid-scale processes
spellingShingle	Alpha models Intermittency LES MHD Subgrid-scale processes Mininni, Pablo Daniel The effect of subfilter-scale physics on regularization models
topic_facet	Alpha models Intermittency LES MHD Subgrid-scale processes
description	The subfilter-scale (SFS) physics of regularization models are investigated to understand the regularizations’ performance as SFS models. The strong suppression of spectrally local SFS interactions and the conservation of small-scale circulation in the Lagrangianaveraged Navier-Stokes α−model (LANS−α) is found to lead to the formation of rigid bodies. These contaminate the superfilter-scale energy spectrum with a scaling that approaches k+1 as the SFS spectra is resolved. The Clark−α and Leray−α models, truncations of LANS−α, do not conserve small-scale circulation and do not develop rigid bodies. LANS−α, however, is closest to Navier-Stokes in intermittency properties. For magnetohydrodynamics (MHD), the presence of the Lorentz force as a source (or sink) for circulation and as a facilitator of both spectrally nonlocal large to small scale interactions as well as local SFS interactions prevents the formation of rigid bodies in Lagrangian-averaged MHD (LAMHD−α). We find LAMHD−α performs well as a predictor of superfilter-scale energy spectra and of intermittent current sheets at high Reynolds numbers.We expect it may prove to be a generally applicable MHD-LES. © Springer Science+Business Media B.V. 2011.
author	Mininni, Pablo Daniel
author_facet	Mininni, Pablo Daniel
author_sort	Mininni, Pablo Daniel
title	The effect of subfilter-scale physics on regularization models
title_short	The effect of subfilter-scale physics on regularization models
title_full	The effect of subfilter-scale physics on regularization models
title_fullStr	The effect of subfilter-scale physics on regularization models
title_full_unstemmed	The effect of subfilter-scale physics on regularization models
title_sort	effect of subfilter-scale physics on regularization models
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13824309_v16_n_p411_Graham http://hdl.handle.net/20.500.12110/paper_13824309_v16_n_p411_Graham
work_keys_str_mv	AT mininnipablodaniel theeffectofsubfilterscalephysicsonregularizationmodels AT mininnipablodaniel effectofsubfilterscalephysicsonregularizationmodels
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The effect of subfilter-scale physics on regularization models

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