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Planar collapse of a submerged granular column

机译：淹没颗粒柱的平面塌陷

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摘要

Submerged mass flows are commonly considered a natural geohazard that interacts with terrestrial and submarine infrastructure and communities and are linked to the generation of tsunamis. Previous studies have investigated submerged mass flows by means of the benchmark case of a granular column collapse. This study explores the mobility and collapse dynamics of submerged granular columns within a planar configuration as a function of the column aspect ratio a. The use of a planar configuration allows the monitoring of the moving mass and its deformation patterns and provides a novel insight into the particle-fluid interactions at release and during collapse not possible before. Special attention was devoted to the column saturation and release mechanism. The column mobility is observed to be directly controlled by a and is linked to a clear distinction between triangular and trapezoidal deposits. The column collapse is found to be described by two characteristic times, marking transition points through the collapse stages. The associated deformation patterns reflect both at a column scale and at localized particle groups during collapse, reflecting in the velocity scaling of a deformable and moving granular mass and the occasional ejection of particles at its surface. We observed that the area of the released portion decreases during collapse and converge toward an equivalent portion of surface particles with little influence by a. The experimental results provide a novel insight into the study of submerged mass flows and set a reference behavior for future numerical validations.
机译：淹没质量流量通常被认为是自然地质灾害与陆地和海底基础设施和社区交互，并链接到海啸的发生。以前的研究通过粒状柱塌陷的基准情况研究了浸没量流。本研究探讨了平面配置内浸没式粒度柱的移动性和折叠动态作为列纵横比a的函数。使用平面配置允许监测运动质量及其变形图案，并在释放时的颗粒流体相互作用和在不可能的坍塌期间提供新的洞察力。特别注意柱饱和和释放机制。观察到柱移动性直接由A控制，并与三角形和梯形沉积物之间的清晰区别连接。发现列崩溃是由两个特征时间描述的，通过折叠级标记过渡点。相关的变形模式在塌陷期间以列刻度和局部颗粒组反映，反射可变形和移动颗粒质量的速度缩放和其表面上的颗粒的偶尔喷射。我们观察到，释放部分的面积在坍塌期间减少，并且朝向等同的表面颗粒的相同部分具有很小的影响。实验结果提供了对浸没质量流动研究的新颖洞察力，并为未来的数值验证设定参考行为。

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  • 来源
    《Physics of fluids》 |2019年第8期|共12页
  • 作者

    Pinzon G.; Cabrera M.;

  • 作者单位

    Univ Los Andes Dept Civil &

    Environm Engn Bogota Colombia;

    Univ Los Andes Dept Civil &

    Environm Engn Bogota Colombia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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