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Titolo:
Selection of velocity profile and flow depth in granular flows - art. no. 031305
Autore:
Andreotti, B; Douady, S;
Indirizzi:
Ecole Normale Super, Phys Stat Lab, F-75231 Paris 05, France Ecole NormaleSuper Paris France 05 s Stat Lab, F-75231 Paris 05, France
Titolo Testata:
PHYSICAL REVIEW E
fascicolo: 3, volume: 6303, anno: 2001,
parte:, 1
pagine: 1305 -
SICI:
1063-651X(200103)6303:3<1305:SOVPAF>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURFACE FLOWS; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Andreotti, B Ecole Normale Super, Phys Stat Lab, 24 Rue Lhomond, F-75231 Paris 05, France Ecole Normale Super 24 Rue Lhomond Paris France 05 5, France
Citazione:
B. Andreotti e S. Douady, "Selection of velocity profile and flow depth in granular flows - art. no. 031305", PHYS REV E, 6303(3), 2001, pp. 1305

Abstract

The dynamics of a two-dimensional pile constituted by spherical grains organized in parallel layers is investigated theoretically. Only three effectsare taken into account in the model: driving by gravity, nonlocal dissipation due to shocks, and trapping of grains by the bumps of the underneath layer. This is sufficient to recover the basic properties of granular avalanches: the transition between static and flowing state is hysteretic; the pile does not flow on the whole height but only in a layer at the surface; thevelocity profile inside the flowing layer is approximately linear and is followed by a creep motion in the (quasi) static part. The flow height increases as a function of the pile angle and tends to infinity for a critical angle cp,. The dependence of this critical angle with the static angle phi (s), the restitution coefficient rho, and the moment of inertia J, is investigated.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 16:09:01