Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0320.1 |
Entrainment in Resolved, Dry Thermals | |
Lecoanet, Daniel1,2; Jeevanjee, Nadir3,4 | |
2019-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:12页码:3785-3801 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Entrainment in cumulus convection remains ill understood and difficult to quantify. For instance, entrainment is widely believed to be a fundamentally turbulent process, even though Turner pointed out in 1957 that dry thermals entrain primarily because of buoyancy (via a dynamical constraint requiring an increase in radius r). Furthermore, entrainment has been postulated to obey a 1/r scaling, but this scaling has not been firmly established. Here, we study the classic case of dry thermals in a neutrally stratified environment using fully resolved direct numerical simulation. We combine this with a thermal tracking algorithm that defines a control volume for the thermal at each time, allowing us to directly measure entrainment. We vary the Reynolds number (Re) of our thermals between laminar (Re approximate to 600) and turbulent (Re approximate to 6000) regimes, finding only a 20% variation in entrainment rate epsilon, supporting the claim that turbulence is not necessary for entrainment. We also directly verify the postulated epsilon 1/r scaling law. |
英文关键词 | Convection Entrainment Turbulence Convective clouds Convective-scale processes Cloud resolving models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000498579700001 |
WOS关键词 | ENVIRONMENT INTERFACE INSTABILITY ; SHALLOW CUMULUS CLOUDS ; CLIMATE SENSITIVITY ; ISOLATED MASSES ; PART II ; CONVECTION ; BUOYANCY ; MOTION ; MODEL ; DETRAINMENT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/226007 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA; 2.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA; 3.Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA; 4.Princeton Univ, Program Atmosphere & Ocean Sci, Princeton, NJ 08544 USA |
推荐引用方式 GB/T 7714 | Lecoanet, Daniel,Jeevanjee, Nadir. Entrainment in Resolved, Dry Thermals[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(12):3785-3801. |
APA | Lecoanet, Daniel,&Jeevanjee, Nadir.(2019).Entrainment in Resolved, Dry Thermals.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(12),3785-3801. |
MLA | Lecoanet, Daniel,et al."Entrainment in Resolved, Dry Thermals".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.12(2019):3785-3801. |
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