@inproceedings{9f45414b7ed34d16985ee031b3712cbf,
title = "Simulation of strongly stratified fluids",
abstract = "Stably and strongly stratified turbulent flows have been studied by employing scaling analysis of the governing equations along the lines of [1], [2] and [3]. The scaling analysis suggests the existence of two different dynamical states. The parameter determining the state is R = ReF h 2, where Re and Fh are the Reynolds number and horizontal Froude number, respectively. If R≫1, viscous forces are negligible and the turbulence is strongly anisotropic but three-dimensional and causes a forward energy cascade. The vertical length scale lv scales as l v ∼ U/N (U is a horizontal velocity scale and N is the Brunt-V{\"a}is{\"a}l{\"a} frequency). If R≪1, horizontal inertial forces are balanced by vertical viscous shearing and lv ∼ l hRe -1/2 (l h is a horizontal length scale). The scaling analysis has been confirmed by direct numerical simulations of homogeneous stratified turbulence. Spectra have been studied as well.",
keywords = "DNS, Geophysical flows, Stratification, Turbulence",
author = "G. Brethouwer and P. Billant and E. Lindborg",
year = "2008",
month = dec,
day = "1",
doi = "10.1007/978-1-4020-6472-2\_56",
language = "English",
isbn = "9781402064715",
series = "Solid Mechanics and its Applications",
pages = "373--378",
booktitle = "IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence",
note = "IUTAM Symposium on Computational Physics and New Perspectives in Turbulence ; Conference date: 11-09-2006 Through 14-09-2006",
}