跃移层风沙输运数值模拟

利用fluent软件,选用欧拉-欧拉法对跃移层风沙输运进行模拟,分析了粒径、风速对沙粒体积浓度的影响。结果表明:风沙流发育分为增长、回落和稳定3个阶段;风沙流稳定后沙粒体积浓度沿高度按层分布;输运层主要集中于地表30 cm以下;同一粒径沙粒,随着风速的增大,沙粒体积浓度最大值与最大值出现的高度增大;同一种风速下,粒径增大,体积浓度最大值减小,最大值出现的高度则增高。

Numerical Simulation of Wind-Sand Transport in Saltation Layer

Based on FLUENT software,numerical simulations of wind-sand transport in saltation layer were carried using Eulerian-Eulerian model,particle diameter、velocity effected on sand volume concentration distribution along elevation were analyzed.The results show that: the development of wind-sand flow is divided into growth,decline and stability;when wing-sand flow is stabile,sand volume concentration along elevation is obvious by layer distribution;sand transport focuses mainly on 30cm above surface;the same grain size,as wind speed increases,extreme of sand volume concentration and elevation of extreme point increases;the same wind speed,with increase of particle size,extreme of sand volume concentration is reduced,elevation of extreme point in creased.