Artículos de revistas
The effect of subfilter-scale physics on regularization models
Fecha
2011-09Registro en:
Pietarila Graham, Jonathan; Holm, Darryl D.; Mininni, Pablo Daniel; Pouquet, Annick; The effect of subfilter-scale physics on regularization models; Springer/Plenum Publishers; Journal Of Scientific Computing; 49; 1; 9-2011; 21-34
0885-7474
CONICET Digital
CONICET
Autor
Pietarila Graham, Jonathan
Holm, Darryl D.
Mininni, Pablo Daniel
Pouquet, Annick
Resumen
The subfilter-scale (SFS) physics of regularization models are investigated to understand the regularizations' performance as SFS models. Suppression of spectrally local SFS interactions and conservation of small-scale circulation in the Lagrangian-averaged 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. All three models are found to be stable at high Reynolds number. Differences between L 2 and H 1 norm models are clarified. 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). LAMHD-α performs well as a predictor of superfilter-scale energy spectra and of intermittent current sheets at high Reynolds numbers. It may prove generally applicable as a MHD-LES. © 2010 Springer Science+Business Media, LLC.