| Project/Area Number |
15560443
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Kyoto University |
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Principal Investigator |
USHIJIMA Satoru Kyoto University, Faculty of Eng., associate prof., 工学研究科, 助教授 (70324655)
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| Co-Investigator(Kenkyū-buntansha) |
KIMURA Ichirou Mastue Kousen, civil eng.Dept., associate prof., 土木工学科, 助教授 (60225026)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | three-phase flow / incompressible flow / particle transportation / critical condition for particle movement / free-surface flow / fluid force / distinct element method |
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| Research Abstract |
A computational method has been developed to predict the transportation of large-scale solid bodies due to 3D free-surface flows. The MICS is based on the CFD method for incompressible flows, in which the treatment for density and mass conservation has been improved in the collocated grid. The multiphase field including solid bodies and liquid and gas phases separated by free surfaces is assumed to be consist of the incompressible and immiscible fluids with different physical properties. The discretization of pressure equations was examined to obtain the numerically stable converged results. The external forces for the particles are evaluated from the results of the fluid computations and a model of the distinct element method(DEM).
It was shown that the particle drag coefficients and wake flows are successfully predicted with MICS. The MICS was applied to a falling particle near a side wall and non-uniform particles moving on the inclined bottom surface. As a result, it was demonstrated that MICS is effective to predict the particle-laden flows. Furthermore, it was shown that the numerical method enables us to predict Rayleigh-Taylor stability problem and drag coefficient of a sphere in a uniform flow as well as the results of hydraulic experiments related to the transportation of multiple spheres by the flow accompanied by wave motions.
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