Abstract
A new spectral theory of stably stratified turbulence has been developed based upon a quasi-Gaussian approximation and a self-consistent procedure of small-scale modes elimination. The theory gives effective anisotropic eddy diffusivity and viscosity; their anisotropization increases with the strength of stratification measured by or ✡ . While the horizontal mixing and momentum transport increase, their vertical counterparts decrease. Horizontal and vertical turbulent Prandtl numbers are computed as functions of or . The vertical Prandtl number, , increases with and is proportional to at large , in agreement with experimental data. This behaviour of reflects the effect of internal gravity waves which do not transport scalars such as the temperature but do transport momentum. The theory also yields analytical expressions for various 1D and 3D spectra including the Corrsin - Obukhov spectrum.
| Original language | English |
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| Pages (from-to) | 483-486 |
| Number of pages | 4 |
| Journal | Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer |
| Volume | 2006-September |
| DOIs | |
| State | Published - 1 Jan 2006 |
| Event | 2006 International Symposium On Turbulence, Heat and Mass Transfer, THMT 2006 - Dubrovnik, Croatia Duration: 25 Sep 2006 → 29 Sep 2006 |
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes