Numerical analysis of the influence of the near ground turbulence on the wind-sand flow under the natural wind

摘要: The near-ground turbulent flow of nature air should have an important influence on the wind-sand flow, because vegetation and/or micro-topography. However, due to complexity flows, effects such turbulences and dust particles are still unknown. In this paper, large eddy simulation–discrete element method was used simulate flow. results show that response time turbulence is approximately 1.6 s. addition, increases rapidly as particle size increases. impact sand transport rate first then decreases wind velocity fluctuation intensity enhanced when less than 0.25, whereas it weakened exceeds 0.25. Furthermore, smaller size, more significant effect. effect mainly concentrated at 0.1–0.2 m from ground height