Pair dispersion in turbulence
arXiv:nlin/0102023 · doi:10.1016/S0378-4371(99)00613-5
Abstract
We study the statistics of pair dispersion in two-dimensional turbulence. Direct numerical simulations show that the pdf of pair separations is in agreement with the Richardson prediction. The pdf of doubling times follows dimensional scaling and shows a long tail which is the signature of close approaches between particles initially seeded with a large separation. This phenomenon is related to the formation of fronts in passive scalar advection.
11 pages, 5 figures