Drag force on two disks moving in a granular bed

29th Workshop on Recent Developments in Computer Simulation Studies in Condensed Matter Physics

物理学;计算机科学

Kuwabara, A.^1 ; Yoshioka, N.^2 ; Shimada, T.^1 ; Ito, N.^1,2

Department of Applied Physics, Graduate School of Engineering, University of Tokyo, 7-3-1 hongo, Bunkyo-ku, Tokyo

113-8656, Japan^1

Riken Aics, 7-1-26 minatojima-minami-machi, Chuo-ku, hyogo, kobe

650-0047, Japan^2

关键词: Constant speed;    Drag forces;    Event-driven;    Granular beds;    Molecular dynamics simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/750/1/012018/pdf
DOI  :  10.1088/1742-6596/750/1/012018

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The drag forces acting on a disk and two disks dragged at constant speeds in a two-dimensional granular bed are measured by an event-driven molecular dynamics simulation. The normal drag force on a disk in case of two disks are dragged in parallel, F2x, is almost the same with the drag force on a disk in case of a single disk is dragged, F1x, when they are apart enough. As the distance between the disks D decreases, F2xincreases until it has the maximum at a certain point, D∗, and after that it decreases. When D is small enough, whether F2xis larger than F1xor not depends on the ratio of the average radius of the granular prticles to the one of the dragged objects.