Computer Simulation On Wind-blown Sand Movement In Wind Tunnel Experiment

In this dissertation, we mainly succeeded in reproducing the wind tunnel experiments of flow field near the highways, Xianwang Liu's sand fence, Wei Zhang et al. and Hongtao Wang et al. by Fluent 6.3.26, and then simulated the structure of sand blown by wind near the highways. The main achievements are made in the following aspects:Firstly, we provided the governing equations and boundary condition of the flow field near the highways and send fences, succeeded in reproducing the wind tunnel experiments of flow field near the highways and Xianwang Liu's sand fence. On this basis, we presented the distribution law of the wind field near the highways and draw the conclusion that there is the influence on the flow from the slope ratio, the width, the height of the roadbed as well as from wind direction. We also provided the distributed law of the leeward wind field of the send fences and drew the conclusion that there is the influence from the number of blank lines and the degree of open hole. The results show that the slope ratio and the height of the roadbed greatly influence the wind field near the highways, and the degree of open hole greatly influence the wind field near the sand fence.Then, we provided the governing equations and boundary condition of the aeolian sand two-phase flow and succeeded in reproducing the wind tunnel experiment of Wei Zhang et al and Hongtao Wang et al. On this basis, we draw the conclusion that the influence from the wind velocity and volume fraction of the sand phase. The results show that with the wind velocity increase, the volume fraction of the sand phase decrease at the same position, and with the volume fraction of the sand phase increase, the wind velocity decrease at the same position.On the basis of theory feasibility and result reliability, we evaluate sand controlled engineering and simulate the structure of sand blown by wind near the highways and discuss the influence from the wind velocity, volume fraction of the sand phase and the slope ratio. The results show that the slope ratio and the height of the highways greatly influence the sand sedimentation near the highways.