円形要素を用いたDEMにおける回転の抑制に関する研究

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Physical experiments and numerical simulations were performed to find under what conditions the formation of arches plugging the flow is likely to occur, throughout the gravity emptying of a silo. In the experiments, rods with the same diameters representing two-dimensional granular particles were used. For computer simulation on this issue, the Discrete Element Method specifically taking into account of rolling friction effect was used. In most cases of DEM simulation, Disc-shaped elements are used to reduce the number of computing routine of checking contact points. But in the case of simulation for quick flow particles which have fewer contact points in the motion, the excess rotatonal motion can be occasionally produced in Disc-shaped elements. By addition of the rolling frictional term to the moment equation of the DEM algorithm, the descrepancy between the results of our experiments and those of Cundall type two-dimensional DEM computer simulations was diminished. Without any considerations of rolling friction effect in DEM, the elements forming the arches are not stable in the sense of rotation and would easily roll out to be broken compared to the results of the experiments. Thus, the results of numerical simulations by the Discrete Element Method taking into account of rolling friction effect were in good agreement with the experimental measures not only in the flow pattern but also in the formation of arches and the wall stress. Therefore these our results showed that DEM of this new type is suitable for reducing of the excess rotational montion of Disc-shaped Elements.
神戸大学の論文
1993-01-30

円形要素を用いたDEMにおける回転の抑制に関する研究

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