Abstract
Because an explicit scheme is generally applied to the cord of the distinct element method which is essential for the numerical movable bed, when flow resistance increases under complicated boundary condition, overlap of particles become excessive to cause abnormally violent repulsion of particle. As a remedy of this fault, the cord is changed substantially by introducing an implicit scheme into the routine of contact-force calculation between particles. The refined cord reproduces the physical experiment of collapse of the column which consists of cylinders, as well as the conventional explicit code. Furthermore, even for granular flow on very steep slope, the solution of which is unstable by an explicit scheme, the refined cord shows a good performance.
