Wind flow moves sand particles in a gas–solid multiphase environment by application of lifting and thrusting forces. This study uses the Reynolds-averaged Navier–Stokes equations and the dense discrete phase method-kinetic theory of granular flow. The study also uses Eulerian and Lagrangian models to simulate air and sand particles, respectively. The goal is to numerically study the behavior of sand particles in the presence of a rigid wall barrier to determine the relationship between the shelter distance (the safe distance after the barrier to prevent sand particle deposition) and the barrier height at different wind speeds. Therefore, sand particles with different mean diameters and mass distributions on the eastern railway line (Tabas), Iran, are examined under different wind speeds. The results indicate that the particles will be deposited at a certain distance after the barrier given their size and wind speed. Accordingly, increasing the diameter of the particles will decrease the shelter distance after the barrier, while increasing the wind speed will increase this distance. Finally, from the discussion of the location of railway tracks around the rigid wall barrier, it is found that a minimum height of 1.2 m is required to create a 17-meter shelter distance, by taking into considerations sandstorms in the eastern Iran. The results can be used to determine the proper distance of rigid wall barriers in desert areas according to specific sand diameter distribution and wind speeds.

风流通过施加推力和推力在气固多相环境中移动沙粒。这项研究使用了雷诺平均的Navier-Stokes方程和稠密离散相方法的颗粒流动力学理论。该研究还使用欧拉模型和拉格朗日模型分别模拟了空气和沙粒。目的是对存在刚性壁障的沙粒的行为进行数值研究，以确定在不同风速下掩蔽距离（屏障后的安全距离，以防止沙粒沉积）与屏障高度之间的关系。因此，在不同的风速下检查了伊朗东部铁路线（塔巴斯）上具有不同平均直径和质量分布的沙粒。结果表明，考虑到粒子的大小和风速，它们将在障碍物之后一定距离处沉积。因此，增大颗粒的直径将减小屏障之后的遮蔽距离，而增大风速将增大该距离。最后，从对刚性墙障周围的铁路轨道位置的讨论中，可以发现，考虑到伊朗东部的沙尘暴，要建立17米的避难所距离，最低高度要求为1.2 m。根据特定的沙粒直径分布和风速，该结果可用于确定沙漠地区刚性壁障的适当距离。增加粒子的直径将减小屏障后的遮蔽距离，而增加风速将增加该距离。最后，从对刚性墙障周围的铁路轨道位置的讨论中，可以发现，考虑到伊朗东部的沙尘暴，要建立17米的避难所距离，最低高度要求为1.2 m。根据特定的沙粒直径分布和风速，该结果可用于确定沙漠地区刚性壁障的适当距离。增加粒子的直径将减小屏障后的遮蔽距离，而增加风速将增加该距离。最后，从对刚性墙障周围的铁路轨道位置的讨论中，可以发现，考虑到伊朗东部的沙尘暴，要建立17米的避难所距离，最低高度要求为1.2 m。根据特定的沙粒直径分布和风速，该结果可用于确定沙漠地区刚性壁障的适当距离。考虑到伊朗东部的沙尘暴。根据特定的沙粒直径分布和风速，该结果可用于确定沙漠地区刚性壁障的适当距离。考虑到伊朗东部的沙尘暴。该结果可用于根据特定的沙粒直径分布和风速来确定沙漠地区刚性壁障的适当距离。