We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection. (C) 2010 Elsevier B.V. All rights reserved.
Non-Gaussian buoyancy statistics in fingering convection / von Hardenberg, Jost; Paparella, Francesco. - In: PHYSICS LETTERS A. - ISSN 0375-9601. - 374:26(2010), pp. 2646-2653. [10.1016/j.physleta.2010.04.051]
|Titolo:||Non-Gaussian buoyancy statistics in fingering convection|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.physleta.2010.04.051|
|Appare nelle tipologie:||1.1 Articolo in rivista|