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DOI | 10.1175/JAS-D-18-0041.1 |
A Numerical Study on the Aerodynamics of Freely Falling Planar Ice Crystals | |
Nettesheim, Joseph J.1,3; Wang, Pao K.1,2 | |
2018-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:9页码:2849-2865 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Taiwan |
英文摘要 | Fluid flow fields and fall patterns of falling planar ice crystals are studied by numerically solving the unsteady, incompressible Navier-Stokes equations using a commercially available computational fluid dynamics package. The ice crystal movement and orientation are explicitly simulated based on hydrodynamic forces and torques representing the 6 degrees of freedom. This study extends the current framework by investigating four planar-type ice crystals: crystals with sector-like branches, crystals with broad branches, stellar crystals, and ordinary dendritic crystals. The crystals range from 0.2 to 5 mm in maximum dimension, corresponding to Reynolds number ranges from 0.2 to 384. The results indicate that steady flow fields are generated for flows with Reynolds numbers less than 100; larger plates generate unsteady flow fields and exhibit horizontal translation, rotation, and oscillation. Empirical formulas for the drag coefficient, 900-hPa terminal velocity, and ventilation effect are given. Fall trajectory, pressure distribution, wake structure, vapor field, and vorticity field are examined. |
英文关键词 | Clouds Ice crystals |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000440542900001 |
WOS关键词 | INTERMEDIATE REYNOLDS-NUMBERS ; SUPERCOOLED WATER DROPS ; SNOW CRYSTALS ; VENTILATION COEFFICIENTS ; MATHEMATICAL-DESCRIPTION ; COLLISION EFFICIENCIES ; TERMINAL VELOCITIES ; CLOUD DROPLETS ; FLOW ; SIMULATION |
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/29746 |
专题 | 地球科学 |
作者单位 | 1.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA; 2.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan; 3.Natl Weather Serv, Silver Spring, MD USA |
推荐引用方式 GB/T 7714 | Nettesheim, Joseph J.,Wang, Pao K.. A Numerical Study on the Aerodynamics of Freely Falling Planar Ice Crystals[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(9):2849-2865. |
APA | Nettesheim, Joseph J.,&Wang, Pao K..(2018).A Numerical Study on the Aerodynamics of Freely Falling Planar Ice Crystals.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(9),2849-2865. |
MLA | Nettesheim, Joseph J.,et al."A Numerical Study on the Aerodynamics of Freely Falling Planar Ice Crystals".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.9(2018):2849-2865. |
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