Scaling laws in two-dimensional turbulent convection.
Two-dimensional homogeneous turbulent convection is studied numerically. Though Bolgiano-Obukhov scaling is approximately valid, strong differences exist in the intermittency properties of velocity and temperature increments, where the latter are similar to those of a passive scalar. The main difference of the small-scale dynamics compared to a passive scalar arises from the Kelvin-Helmholtz instability, but this process does not affect the scaling properties. A condition for a scalar field to show the ramp-and-cliff structures of a passive scalar is discussed.
Biskamp
D
D
Centre for Interdisciplinary Plasma Science, Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany.
Hallatschek
K
K
Schwarz
E
E