沙尘在防沙堤附近沉积特性的数值模拟

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。

Numerical Simulation on Sedimentation Characteristics of Sand Dust Around Sand Preventing Dyke

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.