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Simulation of Terrestrial Dust Devil Patterns


doi: 10.1007/s00376-008-0031-7

  • Introducing the surface properties [initial vortex, ground temperature and surface momentum impact height (SMIH)] for the boundary conditions, dust-devil-scale large eddy simulations (LES) were carried out. Given three parameters of initial vortex, ground temperature and the SMIH based on Sinclair's observation, the dust devil physical characteristics, such as maximum tangential velocity, updraft velocity, pressure drop in the inner core region, and even reverse flow at the top of the core region, are predicted, and are found to be close to the observations, thus demonstrating the ability of the simulation. The physical characteristics of different modeled dust devils are reproduced and compared to the values predicted by Renno et al.' theory. Even for smaller temperature differences or weaker buoyancy, severe dust devils may be formed by strong incipient vortices. It is also indicated that SMIH substantially affects the near-surface shape of terrestrial dust devils.
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Manuscript History

Manuscript received: 10 January 2008
Manuscript revised: 10 January 2008
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Simulation of Terrestrial Dust Devil Patterns

  • 1. Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049;School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049;Department of Chemical Engineering, Tsinghua University, Beijing 100084;School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049

Abstract: Introducing the surface properties [initial vortex, ground temperature and surface momentum impact height (SMIH)] for the boundary conditions, dust-devil-scale large eddy simulations (LES) were carried out. Given three parameters of initial vortex, ground temperature and the SMIH based on Sinclair's observation, the dust devil physical characteristics, such as maximum tangential velocity, updraft velocity, pressure drop in the inner core region, and even reverse flow at the top of the core region, are predicted, and are found to be close to the observations, thus demonstrating the ability of the simulation. The physical characteristics of different modeled dust devils are reproduced and compared to the values predicted by Renno et al.' theory. Even for smaller temperature differences or weaker buoyancy, severe dust devils may be formed by strong incipient vortices. It is also indicated that SMIH substantially affects the near-surface shape of terrestrial dust devils.

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