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Autor Brito, Ricardo |
Documentos disponibles escritos por este autor (47)
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The kinetic theory for tagged-particle problems in lattice-gas cellular automata is extended beyond Boltzmann's mean-field approximation by including correlated ring-type collisions. This theory provides explicit expressions for the velocity aut[...]texto impreso
This paper deals with solutions of the nonlinear Boltzmann equation for spatially uniform freely cooling inelastic Maxwell models for large times and for large velocities, and the nonuniform convergence to these limits. We demonstrate how the ve[...]texto impreso
We investigate the segregation of a dense binary mixture of granular particles that only differ in their restitution coefficient. The mixture is vertically vibrated in the presence of gravity. We find a partial segregation of the species, where [...]texto impreso
We review some exact results for the morion of a tagged particle in simple models. Then, we study the density dependence of the sill-diffusion coefficient D_(N)(?) in lattice systems with simple symmetric exclusion in which the particles can jum[...]texto impreso
The shear viscosity in the dilute regime of a model for confined granular matter is studied by simulations and kinetic theory. The model consists on projecting into two dimensions the motion of vibrofluidized granular matter in shallow boxes by [...]texto impreso
The shear viscosity in the dilute regime of a model for confined granular matter is studied by simulations and kinetic theory. The model consists on projecting into two dimensions the motion of vibrofluidized granular matter in shallow boxes by [...]texto impreso
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Van Noije, T. P. C. ; Ernst, M. H. ; Brito, Ricardo | 1998-05The clustering instability in freely evolving granular fluids manifests itself in the density-density correlation function and structure factor. These functions are calculated from fluctuating hydrodynamics. As time increases, the structure fact[...]texto impreso
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The majority of LGCAs has spurious conservation laws, the so-called staggered invariants, first discovered by Kadanoff, McNamara, and Zanetti. Consequently there are additional hydrodynamic modes of diffusive type, which modify mode coupling the[...]texto impreso
Grosfils, Patrick ; Boon, Jean-Pierre ; Brito, Ricardo ; Ernst, M. H. | American Physical Society | 1993-10We investigate the space and time behavior of spontaneous thermohydrodynamic fluctuations in a simple fluid modeled by a lattice-gas automaton and develop the statistical-mechanical theory of thermal lattice gases to compute the dynamical struct[...]texto impreso
The complete time dependence of the stress-stress correlation functions in lattice gas cellular automata is calculated from the ring kinetic theory using numerical and analytical methods. This provides corrections, typically of 10-20%, to the us[...]texto impreso
Objectives: Research is the foundation of technological progress; the aim of this study is to investigate research success in the USA, the EU and other countries in basic medical, biochemical and biotechnological topics. Methods: Research assess[...]texto impreso
Molera, Juan M. ; Martínez, Froilán C. ; Cuesta, José A. ; Brito, Ricardo | 1995-01In this paper we present a theoretical analysis of a recently proposed two-dimensional cellular automata model for traffic flow in cities with the ingredient of a turning capability. Numerical simulations of this model show that there is a trans[...]texto impreso
A kinetic description of lattice-gas automaton models for reaction-diffusion systems is presented. It provides corrections to the mean-field rate equations in the diffusion-limited regime. When applied to the two-species Maginu model, the theory[...]