This paper focuses on the prediction of particle distributions in a flow field computed by large eddy simulation (LES). In an LES, small eddies are not resolved. This gives rise to the question in which cases these eddies need to be reconstructed (modeled) for tracing particles. Therefore the influence of eddies on the particles in dependence on eddy and particle time-scales is discussed. For the case where modeling is necessary, a stochastic model is presented. The model proposed is a model in physical space and not in velocity space, i.e. not the velocities of the unresolved eddies but the effects of these eddies on particle positions are reconstructed. The model is evaluated by an a priori analysis of particle dispersion in turbulent channel flow.
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