淡江大學機構典藏:Item 987654321/115560
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    题名: A two-phase flow model for submarine granular flows: With an application to collapse of deeply-submerged granular columns
    作者: Cheng-Hsien Lee;Zhenhua Huang
    关键词: Numerical simulation;Two-phase flow model;Particle response time;Granular flow;Initial packing condition;Landslide
    日期: 2018-05
    上传时间: 2018-11-08 12:12:08 (UTC+8)
    出版者: Elsevier
    摘要: The collapse process of a submerged granular column is strongly affected by its initial packing. Previous models for particle response time, which is used to quantify the drag force between the solid and liquid phases in rheology-based two-phase flow models, have difficulty in simulating the collapse process of granular columns with different initial concentrations (initial packing conditions). This study introduces a new model for particle response time, which enables us to satisfactorily model the drag force between the two phases for a wide range of volume concentration. The present model can give satisfactory results for both loose and dense packing conditions. The numerical results have shown that (i) the initial packing affects the occurrence of contractancy/diltancy behavior during the collapse process, (ii) the general buoyancy and drag force are strongly affected by the initial packing through contractancy and diltancy, and (iii) the general buoyancy and drag force can destabilize the granular material in loose packing condition but stabilize the granular material in dense packing condition. The results have shown that the collapse process of a densely-packed granular column is more sensitive to particle response time than that of a loosely-packed granular column.
    關聯: Advances in Water Resources 115, p.286-300
    DOI: 10.1016/j.advwatres.2017.12.012
    显示于类别:[水資源及環境工程學系暨研究所] 期刊論文

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