The effect of subfilter-scale physics on regularization models
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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_13824309_v16_n_p411_Graham |
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todo:paper_13824309_v16_n_p411_Graham2023-10-03T16:11:53Z The effect of subfilter-scale physics on regularization models Graham, J.P. Holm, D. Mininni, P. Pouquet, A. Meyers J. Geurts B. Sagaut P. Geurts B. Salvetti M.V. 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. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Graham, J.P. Holm, D. Mininni, P. Pouquet, A. Meyers J. Geurts B. Sagaut P. Geurts B. Salvetti M.V. 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. |
| format |
SER |
| author |
Graham, J.P. Holm, D. Mininni, P. Pouquet, A. Meyers J. Geurts B. Sagaut P. Geurts B. Salvetti M.V. |
| author_facet |
Graham, J.P. Holm, D. Mininni, P. Pouquet, A. Meyers J. Geurts B. Sagaut P. Geurts B. Salvetti M.V. |
| author_sort |
Graham, J.P. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_13824309_v16_n_p411_Graham |
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