title: Universal decay of scalar turbulence.
abstract: The asymptotic decay of passive scalar fields is solved analytically for the Kraichnan model, where the velocity has a short correlation time. At long times, two universality classes are found, both characterized by a distribution of the scalar-generally non-Gaussian-with global self-similar evolution in time. Analogous behavior is found numerically with a more realistic flow resulting from an inverse energy cascade.
authors: CNRS Observatoire de la Côte d' Azur, Nice, France.
authors: M
authors: M
authors: Chaves
authors: G
authors: G
authors: Eyink
authors: U
authors: U
authors: Frisch
authors: M
authors: M
authors: Vergassola