DEM parameters calibration and verification for coated maize particles

The accuracy of discrete element simulation is determined by simulation parameters. In this research, the parameters of coated maize particles were calibrated and verified using the discrete element method. The optimization object was to take the angle of repose at 27.05°, as determined by the physical test. The optimal contact parameters combination based on the discrete element method was obtained using the Plackett–Burman design, steepest ascent experiment, and Box–Behnken test methods. According to the findings, the static friction coefficient of maize particle–maize particle was 0.237, the rolling friction coefficient of maize particle–maize particle was 0.029, and the rolling friction coefficient of maize particle–aluminum alloy was 0.103. The verification test revealed a relative angle of repose inaccuracy of 0.22% between simulation and physical values. It was possible to get the velocity variation laws, and stability values of maize particles that were consistent with the physical situation. The variation tendency of values was compatible with the physical test when the velocity of the coated maize particles was stable, demonstrating the correctness and dependability of the calibrated parameters.