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A Lagrangian method is introduced for calculating simultaneous n-pointcorrelations of a passive scalar advected by a random velocity field, withrandom forcing and finite molecular diffusivity kappa. The method, which ishere presented in detail, is particularly well suited for studying the kappatending to 0 limit when the velocity field is not smooth. Efficient Monte Carlosimulations based on this method are applied to the Kraichnan model of passivescalar and lead to accurate determinations of the anomalous intermittencycorrections in the fourth-order structure function as a function of the scalingexponent xi of the velocity field in two and three dimensions. Anomalouscorrections are found to vanish in the limits xi tending to 0 and xi tending to2, as predicted by perturbation theory.Comment: 11 pages, LATEX, 8 figures. To appear in Phys. Fluids (revised  version, minor corrections) Special issue Proceedings of the May 1998 Los  Alamos workshop in honor of Robert H. Kraichna

Lagrangian method for multiple correlations in passive scalar advection