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Título:
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A fluctuation formula for the non-galilean factor in lattice gas automata
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Autores:
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Brito, Ricardo ;
Bussemaker, H. J. ;
Ernst, M. H.
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Tipo de documento:
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texto impreso
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Editorial:
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IOP science, 1992-08-07
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/restrictedAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Termodinámica
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Tipo = Artículo
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Resumen:
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A lattice gas automaton lacks Galilei invariance, and equilibria of systems moving with a finite speed \u -->\ are not simply related by a Galilei transformation to the equilibrium distribution in the rest frame. In the hydrodynamic description of low speed equilibria in lattice gas automata a factor G(rho) appears in the nonlinear convective term, del --> . G(rho)rho-u --> u -->, of the Navier-Stokes equation, that differs from unity due to lack of Galilei invariance. For this non-Galilean factor an expression in terms of fluctuating quantities is derived, in a grand ensemble where the total momentum is fluctuating around a zero average. The formula is valid as long as there exists a unique equilibrium state. Consequently, the results can also be used for a direct simulation of G(rho) in lattice gas models where the explicit form of the equilibrium distribution is not known, such as in models that violated semi-detailed balance.
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En línea:
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https://eprints.ucm.es/id/eprint/22130/1/Brito34.pdf
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