Scaling and universality in turbulent convection.
Anomalous correlation functions of the temperature field in two-dimensional turbulent convection are shown to be universal with respect to the choice of external sources. Moreover, they are equal to the anomalous correlations of the concentration field of a passive tracer advected by the convective flow itself. The statistics of velocity differences is found to be universal, self-similar, and close to Gaussian. These results point to the conclusion that temperature intermittency in two-dimensional turbulent convection may be traced back to the existence of statistically preserved structures, as it is in passive scalar turbulence.
Celani
Antonio
A
CNRS, INLN, 1361 Route des Lucioles, 06560 Valbonne, France.
Matsumoto
Takeshi
T
Mazzino
Andrea
A
Vergassola
Massimo
M