Turbulent Mixing of a Passive Scalar

The small scale properties of a passive scalar mixed by a turbulent velocity field show departures from Komogorov theory at least as prominent as for the velocity field1. While one might have imagined that the scalar merely inherits the intermittency of the velocity field itself, a series of recent numerical experiments with a Gaussian but multiscale velocity field argue otherwise.2 A trivial but multiscale velocity produces scalar statistics in some cases quantitatively similar to those obtained in laboratory experiments.3

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