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Article overview
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Randomly driven granular fluids: collisional statistics and short scale structure | I Pagonabarraga
; E Trizac
; T P C van Noije
; M H Ernst
; | Date: |
31 Dec 2001 | Journal: | Phys Rev E, 65 (1 Pt 1), 011303 | Abstract: | We present a molecular-dynamics and kinetic theory study of granular material, modeled by inelastic hard disks, fluidized by a random driving force. The focus is on collisional averages and short-distance correlations in the nonequilibrium steady state, in order to analyze in a quantitative manner the breakdown of molecular chaos, i.e., factorization of the two-particle distribution function, f((2))(x(1),x(2)) approximately chif((1))(x(1))f((1))(x(2)) in a product of single-particle ones, where x(i)=[r(i),v(i)] with i=1,2 and chi represents the position correlation. We have found that molecular chaos is only violated in a small region of the two-particle phase space [x(1),x(2)], where there is a predominance of grazing collisions. The size of this singular region grows with increasing inelasticity. The existence of particle- and noise-induced recollisions magnifies the departure from mean-field behavior. The implications of this breakdown in several physical quantities are explored. | Source: | PubMed, pmid11800689 | Services: | Forum | Review | Favorites |
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