风沙绕流运动对农业设施影响的数值模拟研究  

Numerical simulation research on flow field of wind with sands around agricultural facilities

作　　者：刘博[1,2] 黄新成[1,2] 王旭峰[1,2] 蒋建云[1,2] 田建刚[1,2] 

机构地区：[1]塔里木大学机械电气化工程学院,新疆阿拉尔843300 [2]南疆农业机械化研究中心,新疆阿拉尔843300

出　　处：《中国农机化学报》2016年第3期245-249,共5页Journal of Chinese Agricultural Mechanization

基　　金：国家自然科学基金项目(11242013;11162017)

摘　　要：针对沙尘暴对南疆地区农业设施的影响现状,利用欧拉双流体模型,研究多相流动控制方程。采用有限元流体模拟软件FLUENT,选用基于雷诺平均的标准k-w湍流模型,对风沙绕流农业设施进行数值模拟,并采用用户自定义函数(UDF)初始化风速。模拟结果与柱状图对照表明:农业设施迎风面、背风面和侧风面最大风压分别为308N、-251N和-251N;设施周围风速在垂直地面方向呈现分层结构、在背风面水平方向由内向外风速呈先增大后减少趋势;离散相模拟结果显示沙粒运动轨迹绕行农业设施呈抛物线下落,由设施在整个流体空间所占尺寸比例得出在20m后的区域形成堆积。模拟结果有助于预测农业设施周围风沙运动、沙粒堆积情况,可以为农业设施建设的优化设计和周围环境改善提供重要参考。Southern storms affect the status for agricultural facilities, based on Euler-euler Two-fluid Flow Model, multiphase flow control equations are researched. By using the finite element fluid simulation software FLUENT and the standard k-w model, the flow field of wind with sands around agricultural facilities is numerically simulated, and also the air speed is initialized by UDF. According to fluid phase simulation results the control histogram： agricultural facilities windward, leeward and maximum crosswind surface pressure were 308N, -251N and -251N;The wind surrounding facilities presents a hierarchical structure in the direction perpendicular to the ground and the trend of crosswind surface of wind speed increases first and then just started there decreases; In addition, the discrete phase simulation results show that trajectories of sand bypass agricultural facilities parabolic whereabouts , accumulation in the region after the formation of 20m. The simulation results help to predict the movement of sand around the agricultural facilities and sand buildup. The simulation results can provide important reference for the optimal design of agricultural facilities construction and improved facilities of surrounding environment.

关 键 词：风沙绕流 多相流 FLUENT 数值模拟 农业设施 

分 类 号：P931.3[天文地球—自然地理学] O368[理学—流体力学]