| 项目编号: | 1445783
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| 项目名称: | Collaborative Research: CEDAR: High-Resolution Imaging of Instability Dynamics and Breakdown |
| 作者: | David Fritts
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| 承担单位: | G & A Technical Software, Inc.
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| 批准年: | 2014
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| 开始日期: | 2015-07-15
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| 结束日期: | 2018-06-30
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| 资助金额: | USD240000
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | turbulent viscosity
; 3-year collaborative investigation
; high-resolution direct numerical simulation
; kelvin-helmholtz instability
; flow instability
; khi breakdown
; fluid dynamics
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| 英文摘要: | This is a 3-year collaborative investigation between The Aerospace Corporation and GATS Inc. to place a new airglow camera at the Andes Lidar Observatory (ALO) in Chile and use those data to study turbulent processes near the mesopause. Turbulent viscosity is a critical unknown parameter in numerical models of the 80 to 100 km altitude region. It is notoriously very difficult to measure. This project will provide a method of measuring this parameter in this important atmospheric region where turbulent viscosity may vary by 3 orders of magnitude. The results of this study will also contribute to a more general understanding of fluid dynamics accompanying flow instabilities.
Specifically, this project will utilize the Aerospace Corporation?s new high-resolution infrared camera (AIC2) that uses fast optics and a 2048 x 2048 IR detector to image the OH airglow at 30 m pixel size with a 2 s image cadence. The ALO site also includes a Na wind-temperature lidar and a meteor radar. Data from the AIC2 and the other ALO instruments will be used to investigate the breakdown into turbulence of Kelvin-Helmholtz instabilities (KHIs) and to measure the turbulent viscosity. This new technique will allow characterization of the turbulent viscosity for a variety of background conditions and over daily and seasonal timescales. The measurements will be combined with high-resolution direct numerical simulations to produce the most complete picture to date of KHI breakdown and its evolution into turbulence. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93944
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
David Fritts. Collaborative Research: CEDAR: High-Resolution Imaging of Instability Dynamics and Breakdown. 2014-01-01.
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