It is shown that scalar decay is accompanied by both upscale and downscale transport, however, the situation is asymmetric. The decay of scalar fluctuations in time is due to inertial interval physics, while the spatial correlations of the scalar at the smallest scales are mainly controlled by the viscous part of the flow. Advection of the scalar slows down in the boundary region, while mixing continues to be efficient in the bulk, far from the boundaries. The result is that the boundary region supplies the scalar into the bulk.
|Original language||English (US)|
|Journal||Physical review letters|
|State||Published - Jan 24 2003|
ASJC Scopus subject areas
- Physics and Astronomy(all)