Drag Law of Two Dimensional Granular Fluids

Drag Law of Two Dimensional Granular Fluids
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二维粒状流体的阻力定律

DOI:
10.1061/(asce)em.1943-7889.0001054
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发表时间:
2015
期刊:
arXiv: Soft Condensed Matter
影响因子:
--
通讯作者:
H. Hayakawa
H. Hayakawa
中科院分区:
--
文献类型:
--
作者:
S. Takada;H. Hayakawa

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基于离散元方法,分析了二维散体介质中运动圆盘的阻力规律。值得注意的是,在中等密度和纯二维颗粒介质中,与示踪剂表面分离的理想流体可以很好地再现运动圆盘上的阻力。如果颗粒盘和底板之间存在干摩擦,则出现与盘的移动速度无关的屈服力。在这种情况下,完美的流动性被破坏了。屈服力和阻力在干扰点处发散。
The drag force law acting on a moving circular disk in a two-dimensional granular medium is analyzed based on the discrete element method (DEM). It is remarkable that the drag force on the moving disk in moderate dense and pure two-dimensional granular medium can be well reproduced by a perfect fluid with separation from the surface of the tracer. A yield force, being independent of the moving speed of the disk, appears if a dry friction between the granular disks and the bottom plate exists. The perfect fluidity is violated in this case. The yield force and the drag force diverge at the jamming point.
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