期刊
GRANULAR MATTER
卷 19, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s10035-017-0706-9
关键词
Mesoscales; Micromechanics; DEM; Force chains; Autocorrelation; Pore network
Based on a discrete element method, this paper investigates the basic mechanisms and the associated scales related to grain detachment and grain transport processes at stake in widely graded poly-disperse assemblies of spheres subjected to internal fluid flows. From the identification of force chains, particles sensitive to grain detachment are identified. Based on the computation of autocorrelation lengths, a typical length scale associated with this phenomenon is then defined. From the characterization of the void space as a pore network, particles eligible for grain transport are identified among the detachable particles. Based on the definition of a mean travel distance, the typical length scale associated with grain transport is finally characterized. The comparison between the two length scales highlights a scale separation between grain detachment and grain transport.
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