Abstract
The near-ground turbulent flow of nature air should have an important influence on the wind-sand flow, because of the vegetation and/or micro-topography. However, due to the complexity of turbulent flows, the effects of such turbulences and dust particles are still unknown. In this paper, the large eddy simulation–discrete element method was used to simulate the wind-sand flow. The results show that the response time of the wind-sand flow to turbulence is approximately 1.6 s. In addition, the response time increases rapidly as the particle size increases. The turbulence impact on the sand transport rate first increases and then decreases as the wind velocity fluctuation intensity increases. The sand transport rate is enhanced when the turbulence intensity is less than 0.25, whereas it is weakened when the turbulence intensity exceeds 0.25. Furthermore, the smaller the particle size, the more significant the effect. The effect of turbulence is mainly concentrated at 0.1–0.2 m from the ground and the turbulence increases the height of the wind-sand flow.
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The datasets used or analysed during the current study are available from the corresponding author on reasonable request.
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The program code used is not attached to the manuscript, and if the reader requests it, the author is willing to provide it.
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This work is supported by the National Natural Science Foundation of China (11362010&11902131).
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Ma realized the calculation and analysis process as well as wrote the manuscript. YW and JZ help deal with the data and the post-translation work. All authors attended discussion with this work and gave suggestions.
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Ma, G., Wang, Y. & Zheng, J. Numerical analysis of the influence of the near ground turbulence on the wind-sand flow under the natural wind. Granular Matter 23, 40 (2021). https://doi.org/10.1007/s10035-021-01097-3
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DOI: https://doi.org/10.1007/s10035-021-01097-3