Arid
DOI10.1007/s10652-011-9230-3
A CFD study of wind patterns over a desert dune and the effect on seed dispersion
Joubert, Eugene C.1; Harms, Thomas M.1; Muller, Annethea2; Hipondoka, Martin2; Henschel, Joh R.3
通讯作者Joubert, Eugene C.
来源期刊ENVIRONMENTAL FLUID MECHANICS
ISSN1567-7419
出版年2012
卷号12期号:1页码:23-44
英文摘要

In the Namib Desert seed distribution is greatly influenced by wind patterns. Existing literature regarding wind patterns over dunes focuses on two-dimensional simulations of flow over simplified dune structures. The three-dimensional geometries of the sand dunes suggests far more complex flow features exist, which are not captured by two-dimensional simulations. Computational fluid dynamics (CFD) was used to reproduce the three-dimensional near surface wind patterns around a dune with the aim to learn more about seed distribution. Field work included terrain mapping, wind speed, direction and temperature metering. The CFD results show the expected two-dimensional flow features of high pressure at the dune toe, low pressure at the crest and flow acceleration up windward slope. Also observed are some three-dimensional flow features such as a spiral vortex near the crest and transverse flow due to crest-line curvature of the dune. It was also observed how the wall shear stress differs due to the three-dimensional shape of the dune. The wall shear stress suggests that seed accumulation is more likely to occur behind trailing (down-wind) crest edges. Particle tracking showed how seeds tend to move over the dune crest and recirculate towards the crest on the lee-side. The study showed that adding the third dimension makes the simulations more complex, adds to computational requirements and increases simulation time but also provides vital flow information which is not possible with two-dimensional simulations.


英文关键词Computational fluid dynamics Atmospheric flow Dune Particle tracking
类型Article
语种英语
国家South Africa ; Namibia
收录类别SCI-E
WOS记录号WOS:000299173800003
WOS关键词FLOW ; MODELS ; LAYER ; RANS ; LES
WOS类目Environmental Sciences ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172203
作者单位1.Univ Stellenbosch, Dept Mech & Mechatron Engn, ZA-7600 Stellenbosch, South Africa;
2.Univ Namibia, Dept Geog & Environm, Windhoek, Namibia;
3.Desert Res Fdn Namibia, Gobabeb Training & Res Ctr, Windhoek, Namibia
推荐引用方式
GB/T 7714
Joubert, Eugene C.,Harms, Thomas M.,Muller, Annethea,et al. A CFD study of wind patterns over a desert dune and the effect on seed dispersion[J],2012,12(1):23-44.
APA Joubert, Eugene C.,Harms, Thomas M.,Muller, Annethea,Hipondoka, Martin,&Henschel, Joh R..(2012).A CFD study of wind patterns over a desert dune and the effect on seed dispersion.ENVIRONMENTAL FLUID MECHANICS,12(1),23-44.
MLA Joubert, Eugene C.,et al."A CFD study of wind patterns over a desert dune and the effect on seed dispersion".ENVIRONMENTAL FLUID MECHANICS 12.1(2012):23-44.
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