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Granular flow simulation in a centrifugal acceleration field

机译：离心加速场中的粒状流动模拟

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摘要

The use of the geotechnical centrifuge to obtain scaled physical models is a useful tool in geomechanics. When dealing with granular flows, however, the traditional scaling principles are challenged by the complex rheology of the material and by the non-trivial effects of the Coriolis apparent acceleration. In a laboratory centrifuge, obtaining a clear understanding of these effects is further complicated by the technical difficulties in obtaining flows in steady conditions. In this work, the scaling principles for granular flows are studied using a numerical model based on the discrete-element method. In this way it is possible to obtain a steady flow in a rotating reference frame, and to explore the variation of macroscopic properties by changing the scaling factor and the distance from the rotation centre. The outcome is compared with the prediction obtained with a continuum theory for frictional flows. Results show that granular flows scale consistently only when the Coriolis acceleration is negligible, and are severely altered otherwise. The augmented acceleration field is also responsible for an alteration of the flow state, driving the system towards the inertia-driven collisional regime.
机译：使用岩土离心机以获得缩放的物理模型是地质力学中的一个有用的工具。然而，在处理粒度流动时，传统的缩放原则受到材料的复杂流变学并通过科里奥利显情加速的非微不足道的效应挑战。在实验室离心机中，通过在稳定条件下获得流量的技术困难，对这些效果的明确了解进一步复杂化。在这项工作中，使用基于离散元方法的数值模型研究了粒度流的缩放原理。以这种方式，可以通过改变缩放因子和距离旋转中心的距离来获得旋转参考框架中的稳定流动，并探讨宏观特性的变化。将结果与用摩擦流动的连续理论获得的预测进行了比较。结果表明，只有当科里奥利加速度忽略不计时，颗粒流量仍然一致，并且否则严重改变。增强的加速度领域也负责流动状态的改变，驱动系统朝向惯性驱动的碰撞状态。

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