著者

酒井 幹夫 山田 祥徳 茂渡 悠介

出版者

The Society of Powder Technology, Japan

雑誌

粉体工学会誌 (ISSN:03866157)

巻号頁・発行日

vol.47, no.8, pp.522-530, 2010-08-10 (Released:2010-08-25)

参考文献数

23

被引用文献数

5 5

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The Discrete Element Method (DEM) is widely used in computational granular dynamics. The DEM is a Lagrangian approach where individual particle is calculated based on the Newton's second law of motion. Hence, the DEM enables us to investigate the granular flow characteristics at the particle level. On the other hand, the DEM has a difficulty to be used in large-scale powder systems because the calculation cost becomes too expensive when the number of particles is huge. Consequently, we have developed a coarse grain modeling as a large scale model of the DEM. The coarse grain particle represents a group of original particles. The coarse grain model was applied in typical gas-solid and solid-liquid two phase flows. The cohesive force like the van der Waals force was not considered in these simulations. In the present study, the coarse grain model is evolved to simulate the cohesive particles by considering the interparticle van der Waals force. The adequacy of the coarse grain model is proved by comparing the simulation results of original particle system. It is shown that the coarse grain model considering the interparticle force can simulate the original particle behavior precisely.

著者

茂渡 悠介 酒井 幹夫 水谷 慎 青木 拓也 斉藤 拓巳

出版者

日本混相流学会

雑誌

混相流 (ISSN:09142843)

巻号頁・発行日

vol.24, no.5, pp.681-688, 2011-03-15 (Released:2011-06-15)

参考文献数

11

被引用文献数

3 3

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Numerical approaches of the solid-liquid flows were not established so far. This is because the modeling of free surface and solid phase was difficult, furthermore the calculation cost might become excessive. In the present study, a new method is developed to simulate the solid-liquid flows involving the free surface. In this method, the solid-liquid flows were computed by combining the Discrete Element Method (DEM) and the Moving Particle Semi-implicit (MPS) method. This is called the DEM-MPS method. In the present study, the validation of the DEM-MPS method was performed in a solid-liquid flow involving free surface in a rotating tank. The angle of repose and solid distribution were compared between the simulations and experiments. The simulation results were in good agreement with those obtained by the experiment.