论文标题
形状在力穿过密集颗粒介质的入侵者上的作用
Role of shape on the forces on an intruder moving through a dense granular medium
论文作者
论文摘要
我们使用数值模拟来研究入侵者的形状对通过平均直径d组成的颗粒介质移动时所经历的阻力和提升力的影响。从0.1 \ sqrt（dg）到20 \ sqrt（dg），入侵速度V v。对于无摩擦颗粒（μ= 0.0），随着V的增加，阻力逐渐增加，而对于摩擦系统（μ= 0.1,0.5），在低速下出现恒定的阻力状态。如果横截面相同，则阻力力弱取决于对象的形状。阻力力是线性取决于浸入深度的，而在某些形状的深度上，升力力的变化很小。物体所经历的升力是其在给定速度下形状的强大功能。形状对入侵者表面周围的接触分布有影响，这可能会导致某些形状的强大提升。我们还显示了入侵者表面周围的力剖面。
We use numerical simulation to investigate the effect an intruder's shape has on the drag and lift forces that it experiences while moving through a granular medium composed of polydisperse disks of mean diameter d. The intruder velocity,v, was varied from 0.1 \sqrt(dg) to 20 \sqrt(dg). For frictionless particles (μ= 0.0)there is a gradual increase in drag force with increasing v, whereas for frictional systems (μ= 0.1,0.5) a constant drag regime appears at low velocities. The drag force depends weakly on the shape of the object provided that the cross-section is same. The drag force depends linearly on the immersion depth, while there is very little variation in lift force with depth for certain shapes. The lift experienced by the object is a strong function of its shape at a given velocity. Shape has an effect on the distribution of contacts around the surface of the intruder which may result in a strong lift for certain shapes. We also show the force profiles around the intruder surface.
