par Vanden Eijnden, Eric 
;Hanon, David ;Boon, Jean-Pierre
Référence Fluid mechanics and its applications, 46, page (183-186)
Publication Publié, 1998
;Hanon, David ;Boon, Jean-Pierre Référence Fluid mechanics and its applications, 46, page (183-186)
Publication Publié, 1998
Article révisé par les pairs
| Résumé : | The passive advection of a scalar quantity by a random velocity field is a problem encountered in a wide variety of situations like mass, charge and heat transport in turbulent fluids, dispersion in porous media, Of particular interest is the long-time large-scale dynamics of the scalar. In this work we use a combination of multiscale and projection techniques for analyzing the advection of a scalar by a random velocity field whose ensemble-average is periodic in space. General expressions relating the scalar transport to the properties of the flow are obtained. The method is applied to the analysis of scalar advection in a turbulent flow generated by a lattice gas automaton and whose ensemble-average is a two-dimensional ABC type flow. |
