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DOI | 10.1016/j.atmosres.2016.08.017 |
A preliminary numerical study on the time-varying fall attitudes and aerodynamics of freely falling conical graupel particles | |
Chueh, Chih-Che1; Wang, Pao K.1,2; Hashino, Tempei3 | |
2017 | |
发表期刊 | ATMOSPHERIC RESEARCH
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2017 |
卷号 | 183 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan; USA; Japan |
英文摘要 | The flow fields and dynamic motions of conical graupel of diameters 0.5-5 mm falling in air of 800 h Pa and 8 degrees C are studied by solving the transient Navier-Stokes equations numerically for flow past the conical graupel and the body dynamics equations representing the 6-degrees-of-freedom motion that determines the position and orientation of the graupel in response to the hydrodynamic force of the flow fields. The shape of conical graupel made through a simple but practical existing mathematical equation allows us to have an uneven mass distribution, which is generally believed to have great influence on ice particles' orientations while falling when inertial force becomes increasingly dominant over other effects. The simulated motions include vertical fall, lateral translation, sailing, rotation and pendulum swing. The computed flow fields are characterized in terms of streamtrace patterns as well as the voracity magnitude fields, and the corresponding motions of the conical graupel is physically featured by looking upon the graupel surface distributions of pressure coefficient, torques contributed by both pressure as well as viscous effects. Tumbling doesn't occur when an initial orientation of the graupel is either 20 degrees or 160 degrees about Y axis, and the torque contributed by the pressure effect is dominant over that contributed by the viscous effect. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Ice particle rotation Falling ice particles Low Reynolds numbers Mathematical expressions Hydrodynamic torque Numerical solution Tumbling |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000386861800005 |
WOS关键词 | HEXAGONAL ICE CRYSTALS ; FLOW-FIELDS ; PRECIPITATION ; SIMULATION ; IMPACT ; AIR ; MICROPHYSICS ; HAILSTONES ; DYNAMICS ; BEHAVIOR |
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/15269 |
专题 | 地球科学 |
作者单位 | 1.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan; 2.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA; 3.Kyushu Univ, Appl Mech Res Inst, Fukuoka, Japan |
推荐引用方式 GB/T 7714 | Chueh, Chih-Che,Wang, Pao K.,Hashino, Tempei. A preliminary numerical study on the time-varying fall attitudes and aerodynamics of freely falling conical graupel particles[J]. ATMOSPHERIC RESEARCH,2017,183. |
APA | Chueh, Chih-Che,Wang, Pao K.,&Hashino, Tempei.(2017).A preliminary numerical study on the time-varying fall attitudes and aerodynamics of freely falling conical graupel particles.ATMOSPHERIC RESEARCH,183. |
MLA | Chueh, Chih-Che,et al."A preliminary numerical study on the time-varying fall attitudes and aerodynamics of freely falling conical graupel particles".ATMOSPHERIC RESEARCH 183(2017). |
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