针对立式搅拌磨机筒体内部存在螺旋搅拌器、研磨介质球、矿浆等复杂的多相物质耦合运动，开展基于DEM−CFD的耦合仿真方法及实验研究。首先，基于立式搅拌磨机工作原理，采用离散元方法（DEM）和流体动力学（CFD）分别模拟颗粒相和流体相，建立筒体内部流固耦合理论模型；其次，建立实验样机简化模型，研究介质球DEM模型、矿浆流体域CFD模型和DEM−CFD耦合模型的构建方法及参数；然后，通过实验验证不同仿真模型的准确性。结果表明，DEM−CFD仿真结果比DEM模型更接近实验值，DEM−CFD仿真得到的搅拌器扭矩与实验扭矩存在5.43%的偏差，而DEM模型存在8.14%的偏差。通过对比筒体内部介质球速度、碰撞次数及搅拌器扭矩发现：矿浆作为流体域对立式搅拌磨筒体内部的介质球运动存在显著影响，其浮力和黏性降低了介质球的速度和碰撞次数，相反增加了螺旋搅拌器的扭矩。

A coupling simulation method and experiment based on DEM−CFD were investigated to address the complex multi−phase coupling motion of spiral agitators, grinding media, and slurry inside the cylinder of a vertical stirring mill. Firstly, based on the working principle, the Discrete Element Method (DEM) was used to simulate the particle phase and Computational Fluid Dynamics (CFD) to simulate the fluid phase, respectively. A theoretical model of fluid−solid coupling inside the cylinder was constructed. Secondly, a simplified model of the experimental prototype was established, and the construction methods and parameters of the grinding sphere (DEM), slurry (CFD), and DEM−CFD coupling model were investigated, respectively. Then, the accuracy of different simulation models was verified by experiments. The results showed that the DEM−CFD simulation results were closer to the experimental values than DEM, there was a deviation of 5.43% between the torque obtained from DEM−CFD model and the experimental torque, while the DEM model had a deviation of 8.14%. By comparing the velocity, collision frequency, and agitator torque of the grinding spheres inside the cylinder, it was found that the slurry as a fluid domain had a significant impact on the movement of the grinding spheres. Its buoyancy and viscosity characteristics reduced the velocity and collision frequency, whereas it increased the torque of the spiral agitator.