Turbulent mixing in a rotating, stratified fluid

Yign Noh, Robert R. Long

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

An experimental study was carried out to investigate the effect of rotation on turbulent mixing in a stratified fluid when the turbulence in the mixed layer is generated by an oscillating grid. Two types of experiments were carried out: one of them is concerned with the deepening of the upper mixed layer in a stable, two-fluid system, and the other deals with the interaction between a stabilizing buoyancy flux and turbulence. In the first type of experiments, it was found that rotation suppresses entrainment at larger Rossby numbers. As the Rossby number becomes smaller (Ro<0.1), the entrainment rate increases with rotation-the onset of this phenomenon, however, was found to coincide with the appearance of coherent vortices within the mixed layer. The radiation of energy from the mixed layer to the lower non-turbulent layer was found to occur and the magnitude of the energy flux was found to be increased with the rotational frequency. It was also observed that vortices are generated, rather abruptly, in the lower layer as the mixed layer deepens. In the second set of experiments a quasi-steady mixed layer was found to develop of which the thickness varies with rotation in a fashion that is consistent with the result of the first experiment. Also the rotation was found to delay the formation of a pycnocline.

本文言語英語
ページ(範囲)125-143
ページ数19
ジャーナルGeophysical & Astrophysical Fluid Dynamics
53
3
DOI
出版ステータス出版済み - 7 1 1990

All Science Journal Classification (ASJC) codes

  • 計算力学
  • 天文学と天体物理学
  • 地球物理学
  • 材料力学
  • 地球化学および岩石学

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