摘要：为研究沙尘在防沙堤附近的沉积特点，基于 FLUENT 软件，采用标准 K-ε湍流模型和 DPM 模型对沙尘在防沙堤附近的运动轨迹进行 数值模拟。 结果表明，沙尘的运动轨迹受自身粒径、风速及防沙堤迎风 面坡度的综合影响，沙粒粒径越小，风速越大，防沙堤迎风面坡度越缓， 沙粒越过防沙堤的能力越强；除风速较低时部分小粒径颗粒沉积在防沙堤后端外，其余情况下沙尘沉积主要发生在防沙堤前端。 

关键词：沙尘；防沙堤；运动轨迹，沉积特征

Abstract：To study the sedimentation characteristics of sand dust around sand preventing dyke，the particle tracks were simulated by the standard K -ε model and DPM model based on FLUENT software. The results show that particles moving tracks are affected by particles size，wind velocity and sand preventing dyke l/h ratio of windward side synthetically. The sand dust quantity passing sand preventing dyke increases with wind velocity and l/h，and decreases but the case is just converse with particle size. Customarily most sand dust accumulate in front of the sand preventing dyke，only a little fine particles accumulate in the leeward at lower wind speed. 

Keywords：sand dust；sand preventing dyke；moving track；sedimentation characteristic