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A simple model for nonequilibrium fluctuations in a fluid

par Baras, Florence ;Malek-Mansour, Mohammad-Ali
Référence American Journal of Physics, 64, 12, page (1488-1495)
Publication Publié, 1996

Article révisé par les pairs

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Résumé :

In equilibrium systems, thermal fluctuations are correlated in time (fluctuation-dissipation theorem) yet their instantaneous values are uncorrelated in space over macroscopic distances. Out of equilibrium, long range spatial correlations are predicted by theory and have been observed in both laboratory experiments and computer simulations. In this paper, we present a simple model, called the train model, that illustrates this phenomenon. The theoretical analysis of the model and its connection with fluctuating hydrodynamics are outlined.