The application of unpowered grainspreader is one of the effective methods to alleviate the phenomenon of excessive concentration of impurity.However,it is prone to bias drop because of the reasonable ring width.Discrete element method is used to simulate the drop process of soybean particles under different ring widths. The process of soybean particle falling in the overflow barrel is simulated through the global variable setting,particle model,geometry creation,and the definition of particle factory.The f...