论文标题
在二维颗粒环境中拖拉椭圆形入侵者
Drag of an elliptic intruder in a two-dimensional granular environment
论文作者
论文摘要
在二维颗粒环境中，椭圆形入侵者的阻力是数值研究的。发现与入侵者的主要轴平行的运动是不稳定的。阻力定律是由屈服力和动态项的总和给出的，后者大约通过简单的碰撞模型复制。从完美的流体获得的流线非常适合入侵者周围的流动场，以实现足够大的阻力力。当入侵者与周围颗粒的相互作用平衡时，还研究了入侵者周围的应力场。一旦给出了入侵者表面的应力，发现通风应力功能就可以很好地再现应力场。
The drag of an elliptic intruder in a two-dimensional granular environment is numerically studied. The movement parallel to the major axis of the intruder is found to be unstable. The drag law is given by the sum of the yield force and the dynamic term, the latter of which is approximately reproduced by a simple collision model. The flow field around the intruder for sufficiently larger drag force is well fitted by the streamlines obtained from the perfect fluid. The stress fields around the intruder are also investigated when the movement of the intruder is balanced with interactions with the surrounding particles. The Airy stress function is found to well reproduce the stress fields once the stress on the surface of the intruder is given.
