-
- EP41F-1883: Unifying grain shape effects in granular flows down a rough incline
-
Board 1883‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Lu Jing, Tsinghua University (First Author, Presenting Author)
Jixiong Liu, Tsinghua University
Mengna Zhang, Tsinghua University
Thomas Pähtz, Zhejiang University
Predicting the speed of a landslide becomes increasingly important as global warming drives more geohazards involving glacial materials, rock, snow, and sand. However, existing theoretical predictions of landslide speed have been limited to spherical grains and fail when applied to the non-spherical, irregular shapes almost always encountered in nature. Our paper represents a critical step forward in this regard, as we find a velocity scaling law that unifies experimental and simulation data across vastly different granular materials, consisting of grains with spherical, cubic, pyramidic, elongated, flat, angular, or realistic shapes (including natural sand). Moreover, the scaling law is simpler than existing ones in that it relies only on a single, easily measurable physical bulk parameter of the granular material: the dynamic angle of repose. In addition, the scaling law exhibits a significant influence on the grain-grain sliding friction coefficient that, in agreement with the data, extends far beyond the value at which current granular theories assume its effect to have saturated. Our study therefore, surprisingly, points to fundamental gaps in the current understanding of granular flow rheology, even for the simplest case of spherical grains.
Scientific DisciplineNeighborhoodType
Enter Note
Go to previous page in this tab
Session
