Efficiency of Mixing in Thin Stratified Layers

[0221057]将进行一系列直接数值模拟（DNS）实验，旨在将早期的二维结果扩展到更一般的海洋流动。湍流演化将在各种初始流动中进行模拟，其中薄层的密度变化（与速度相比）和振荡不稳定性导致。本课程将详细研究湍流的物理特性，并将湍流统计数据与Kelvin-Hemholtz波浪的DNS、Holmboe波浪的实验室实验以及在海洋中观测到的Kelvin-Helmholtz波浪的湍流事件进行比较。除了直接增加海洋振荡不稳定性的知识外，还将在未来的观测研究中更清楚地确定不稳定性类别（例如开尔文-亥姆霍兹或霍尔姆波）的诊断方法。

0221057 SmythA sequence of direct numerical simulation (DNS) experiments designed to extend earlier two-dimensional results to more general ocean flows will be performed. Turbulence evolution will be simulated in a variety of initial flows in which density changes in thin layers (compared with velocity) and oscillatory instability results. The physics of turbulence will be studied in detail, and turbulence statistics will be compared with DNS of Kelvin-Hemholtz billows, with laboratory experiments on Holmboe waves, and with turbulent events observed in the ocean as has been done for Kelvin-Helmholtz waves. Besides adding directly to the knowledge of oscillatory instabilities in the ocean, diagnostics that will permit the identification of instability classes (e.g. Kelvin-Helmholtz or Holmboe) more clearly in future observational studies will be defined.