Stratified turbulence: Structural issues, and turbulent diffusion View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1996

AUTHORS

Y. Kimura , J. R. Herring

ABSTRACT

We examine the effects of stratification on eddy—diffusion, and the distribution of pairs of particles released in the flow. DNS results are presented at a resolution of 1283 mesh points. We compare results for particle dispersion to simple analytic theories (such as that proposed by Csanady 1964, and Pearson et al., 1983) by adapting the basic Langevin model to decaying turbulence at low Reynolds numbers. Stable stratification arrests both single particle displacements and pair separation in the direction of stratification. With respect to the dynamics of stratified flows, we find that regions of strong viscous dissipation are intermittently spaced, and are associated with large horizontal vorticity, consistent with recent experimental results by Fincham et al. (1994). The small-scale structures of the flow are pancakes, not worms. As found in previous simulations (Métais et al 1994), vortex filaments develop only under the constraint of strong rotation. More... »

PAGES

195-203

Book

TITLE

Small-Scale Structures in Three-Dimensional Hydrodynamic and Magnetohydrodynamic Turbulence

ISBN

978-3-540-60486-0

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bfb0102416

DOI

http://dx.doi.org/10.1007/bfb0102416

DIMENSIONS

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