Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2017.07.008 |
A CFD study of the influence of turbulence on undercatch of precipitation gauges | |
Baghapour, Behzad; Sullivan, Pierre E. | |
2017-11-15 | |
发表期刊 | ATMOSPHERIC RESEARCH
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2017 |
卷号 | 197 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | The response of precipitation to turbulent fluctuations near gauges is studied using time-averaged (BANS) and unsteady (LES) turbulence modeling. Updrafting effects on catch performance are analyzed for unshielded and shielded gauges. The effective precipitation catchment area of the gauge for both wind-induced effects and snowflake characteristics is found to reduce significantly for small particles in high winds but can be partly recovered by shielding. The variation in the amount of precipitation caught is quantified for different free-stream wind speeds using LES and BANS. The fluctuations, captured with LES are analyzed to determine the local structure of eddies near the orifice plane. Wind-induced drag on precipitates are modeled for a wide range of particle Reynolds numbers from low speed Stokes flow condition to high speed flows with inertial effects. Results show noticeable effect of drag force model on catch performance calculation of precipitation gauges with uncertainties of up to 40% in high winds and large snowflake sizes. Finally, particle wall collision on the catch performance is studied for different restitution conditions. These simulations have differences of up to 5% in catch performance for large particle sizes in high winds, dependent on whether the particles undergo elastic or plastic collisions. Comparing BANS and LES results, turbulence fluctuations show a considerable influence on shielding performance degeneration at high winds. Double shielding the gauge can improve efficiency by maintaining a lower fluctuation-to-mean catch ratio as wind speed increases. |
英文关键词 | Updrafting Undercatch Catching fluctuation BANS LES |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000412250700022 |
WOS关键词 | TERMINAL VELOCITY ; SIMULATION ; SNOW ; MODELS ; DRAG ; FLOW ; LES |
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/38396 |
专题 | 地球科学 |
作者单位 | Univ Toronto, Dept Mech & Ind Engn, 5 Kings Coll Rd, Toronto, ON M5S 3G8, Canada |
推荐引用方式 GB/T 7714 | Baghapour, Behzad,Sullivan, Pierre E.. A CFD study of the influence of turbulence on undercatch of precipitation gauges[J]. ATMOSPHERIC RESEARCH,2017,197. |
APA | Baghapour, Behzad,&Sullivan, Pierre E..(2017).A CFD study of the influence of turbulence on undercatch of precipitation gauges.ATMOSPHERIC RESEARCH,197. |
MLA | Baghapour, Behzad,et al."A CFD study of the influence of turbulence on undercatch of precipitation gauges".ATMOSPHERIC RESEARCH 197(2017). |
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