Relative dispersion in fully developed turbulence: Lagrangian statistics in synthetic flows

The effect of Eulerian intermittency on the Lagrangian statistics of relati ve dispersion in fully developed turbulence is investigated. A scaling rang e spanning many decades is achieved by generating a multi-affine synthetic velocity field with prescribed intermittency features. The scaling laws for the Lagrangian statistics are found to depend on intermittency in agreemen t with a multifractal description. As a consequence of the Kolmogorov law, the Richardson law for the variance of pair separation is not affected by i ntermittency corrections.