Efficiency of Mixing in Thin Stratified Layers

薄分层中的混合效率

• 批准号: 0221057
• 负责人: William Smyth
• 金额: $ 34.23万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-11-15 至 2005-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221057&HistoricalAwards=false
• 关键词: Efficiency; Mixing; Thin; Stratified; Layers

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.

0221057 Smyth 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。将在各种初始流动中模拟湍流演化，其中薄层中的密度变化（与速度相比）和振荡不稳定的结果。将详细研究湍流物理学，并将湍流统计数据与开尔文-亥姆霍兹波涛的 DNS、霍尔姆博伊波的实验室实验以及在海洋中观察到的湍流事件（如开尔文-亥姆霍兹波所做的那样）进行比较。除了直接增加对海洋振荡不稳定性的了解之外，还将定义在未来的观测研究中更清楚地识别不稳定性类别（例如开尔文-亥姆霍兹或霍尔姆博）的诊断方法。