Abstract
A new spectral closure theory for stably stratified turbulent flows is
presented. It is based upon a quasi-Gaussian mapping, the use of the
Langevin equation and an algorithm of successive small scales
elimination. The new theory allows for a broad insight into the dynamics
of stably stratified flows. It accounts for the flow anisotropy and
provides expressions for vertical and horizontal eddy viscosities and
diffusivities. A combined effect of turbulence and waves is considered.
A dispersion relation for internal waves in the presence of turbulence
is derived. The model is used to derive new RANS models. A new
K-ɛ model and the results of its application to atmospheric
boundary layers over ice will be presented.
| Original language | English |
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| Title of host publication | American Physical Society, Division of Fluid Dynamics 56th Annual Meeting |
| State | Published - 1 Nov 2003 |