On the submerging of a spherical intruder into granular beds
On the submerging of a spherical intruder into granular beds
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关于球形入侵者浸没到颗粒床中
DOI：
10.1051/epjconf/201714002027
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发表时间：
2017
影响因子：
--
通讯作者：
Wu C
中科院分区：
文献类型：
--
作者：
Wu C
颗粒材料是一种复杂的系统，其力学行为取决于单个颗粒的材料特性，颗粒与周围介质之间的相互作用，这些因素尚未完全了解。使用先进的离散元方法（DEM），我们模拟的淹没过程中的球形弹丸（入侵者）到颗粒材料的各种属性与零穿透速度（即入侵者是接触的颗粒床的顶面，并从静止释放），并检查其沉降行为。通过系统地改变入侵者的密度和尺寸以及颗粒密度（即颗粒床中颗粒的密度），我们发现入侵者即使以零穿透速度也可以深深地沉入颗粒床中。此外，我们确认，在一定条件下的颗粒床可以表现得像一个牛顿液体和淹没入侵者可以达到一个恒定的速度，即终端速度，相同的球体在液体中的沉降，实验观察到。还建立了一个数学模型来预测入侵者的最大穿透深度。将模型预测与文献报道的实验数据进行比较，取得了良好的一致性，表明该模型可以准确地预测入侵者在颗粒介质中的淹没行为。
Granular materials are complex systems and their mechanical behaviours are determined by the material properties of individual particles, the interaction between particles and the surrounding media, which are still incompletely understood. Using an advanced discrete element method (DEM), we simulate the submerging process of a spherical projectile (an intruder) into granular materials of various properties with a zero penetration velocity (i.e. the intruder is touching the top surface of the granular bed and released from stationary) and examine its settling behaviour. By systematically changing the density and size of the intruder and the particle density (i.e. the density of the particles in the granular bed), we find that the intruder can sink deep into the granular bed even with a zero penetration velocity. Furthermore, we confirm that under certain conditions the granular bed can behave like a Newtonian liquid and the submerging intruder can reach a constant velocity, i.e. the terminal velocity, identical to the settling of a sphere in a liquid, as observed experimentally. A mathematical model is also developed to predict the maximum penetration depth of the intruder. The model predictions are compared with experimental data reported in the literature,good agreement was obtained, demonstrating the model can accurately predict the submerging behaviour of the intruder in the granular media.
一群入侵者在颗粒介质中沉降的合作动力学：DEM 研究
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
C. H. Goey;Chuan
通讯作者：
Chuan