Universal decay of scalar turbulence.
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.
Chaves
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CNRS Observatoire de la Côte d' Azur, Nice, France.
Eyink
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Frisch
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U
Vergassola
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