CAJ | 학술논문

基于 FLENT欧拉双流体模型，对路堤周围风沙两相流运动特性进行数值模拟，并将模拟结果与现场实际调查进行比较。结果表明，所用模型能较好地模拟路堤周围风沙两相流的运动特性，数值模拟与现场调查相吻合。数值模拟分析表明：路堤周围气流速度产生分区，分别形成减速区、加速区、高速区、低速区与紊流区；沙粒速度与风速相互影响，形成一种反馈机制；在过渡区内，当风速大于起沙风速时，沙粒速度与风速呈正相关；正交单向来风条件下，揭示了迎风坡积沙量大于背风坡的形成机理；路堤顶面积沙量呈“正态形”分布，中间多，两边少；迎风坡积沙量随着风速增大而减小，背风坡无明显变化；不同地表条件对风沙流密度及结构影响显著，决定着工程防沙措施。
기우 FLENT구랍쌍류체모형，대로제주위풍사량상류운동특성진행수치모의，병장모의결과여현장실제조사진행비교。결과표명，소용모형능교호지모의로제주위풍사량상류적운동특성，수치모의여현장조사상문합。수치모의분석표명：로제주위기류속도산생분구，분별형성감속구、가속구、고속구、저속구여문류구；사립속도여풍속상호영향，형성일충반궤궤제；재과도구내，당풍속대우기사풍속시，사립속도여풍속정정상관；정교단향래풍조건하，게시료영풍파적사량대우배풍파적형성궤리；로제정면적사량정“정태형”분포，중간다，량변소；영풍파적사량수착풍속증대이감소，배풍파무명현변화；불동지표조건대풍사류밀도급결구영향현저，결정착공정방사조시。
The motion characteristics of wind-blown sand flow around the railway embankment were simulated by the FLENT eulerian two-fluid model,and the simulation results were compared with field surveys.Results show that the model can well simulate the motion characteristics of wind-blown sand flow around the railway embankment,and the numerical simulation is in conformity with field investigations.Numerical simulation a-nalysis shows as follows:Air velocities surrounding the embankment produce partitioned area,i.e.,the decel-eration area,acceleration area,high-speed area,low-speed area and turbulent area;sand speeds and wind speeds influence one another,forming a feedback mechanism;in the transition zone,when the wind speed is greater than the initial sand speed,the velocity of sand grain is positively correlated with the wind speed;the formation mechanism that the sand sediment on the windward slope is more than on the leeward slope is re-vealed under the condition of the single orthogonal wind direction;sand sediment on the top of the embankment is in normal distribution,more in the middle and less on both sides;as the wind speed raizes,windward slope sediment decreases whereas leeward slope sediment has no obvious changes;different ground surface conditions have significant effects on the sand flow density and structure,thus determining the engineering sand preven-tion measures to be taken.