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| Title: | LAGRANGIAN MULTIPHASE FLOW MODEL FOR DEBRIS-FLOW-INDUCED TSUNAMI | |
| DOI No: | 10.1142/9789812701916_0089 | |
| Source: | COASTAL ENGINEERING 2004 (pp 1121-1133) | |
| Author(s): | HITOSHI GOTOH, Associate Professor
Dept. of Urban and Environmental Engrg., Kyoto Univ., Yoshida Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan MINORU HAYASHI, Engineer Dept. of Construction, Nishimuro Promotions Bureau, Wakayama Prefectural Government, Japan TETSUO SAKAI, Professor Dept. of Urban and Environmental Engrg., Kyoto Univ., Japan |
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| Abstract: | A multi-phase phenomenon with fragmentation of water and active mixing of water and sediment can be effectively analyzed by the two-fluid-model based on the particle method. However, the two-fluid-model had the disadvantage in a behavior of solid-phase model that the influence of graded sediment or the change of flow characteristics in sediment deposition process, such as the matter related with the existence of the yield limit in the constitutive law, cannot be expressed. In this paper, the multi-scale link of solid-phase particle is proposed. The interaction between solid-phase particles is described by the distinct element method, or DEM, to reproduce the non-Newtonian characteristics of the solid phase, including the effect of the interparticle collision of the rather large particles. To show the performance of the present model, numerical simulations are carried out for the mud lump dropping into still water and the water wave generated by the sediment flow composed by mixed sized sediment particles rushing into a water surface. | |
| Full Text: | View full text in PDF format (657KB) | |
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