Drag Law of Two-Dimensional Granular Fluids
Publication: Journal of Engineering Mechanics
Volume 143, Issue 1
Abstract
The drag force law acting on a moving circular disk in a two-dimensional granular medium is analyzed based on the discrete element method (DEM). It is remarkable that the drag force on the moving disk in moderate dense and pure two-dimensional granular medium can be well reproduced by a perfect fluid with separation from the surface of the tracer. A yield force, being independent of the moving speed of the disk, appears if a dry friction between the granular disks and the bottom plate exists. The perfect fluidity is violated in this case. The yield force and the drag force diverge at the jamming point.
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Acknowledgments
The authors would like to thank fruitful discussions with R. Blumenfeld, J. D. Goddard, K. Okumura, M. Otsuki and K. Suzuki. The authors are also grateful to K. Saitoh for providing them the prototype of the program for the DEM simulation. This work is partially supported by the Grant-in-Aid of MEXT (Grant No. 25287098).
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 1 • January 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 23, 2015
Accepted: Nov 3, 2015
Published online: Jan 13, 2016
Discussion open until: Jun 13, 2016
Published in print: Jan 1, 2017
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