Journal ArticleDOI
Spreading of a granular mass on a horizontal plane
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In this paper, the transient surface flow occurring when a cylindrical pile of dry granular material is suddenly allowed to spread on a horizontal plane is investigated experimentally as a function of the released mass M, the initial aspect ratio a of the granular cylinder pile, the properties of the underlying substrate (smooth or rough, rigid or erodible) and the bead size.Abstract:
The transient surface flow occurring when a cylindrical pile of dry granular material is suddenly allowed to spread on a horizontal plane is investigated experimentally as a function of the released mass M, the initial aspect ratio a of the granular cylinder pile, the properties of the underlying substrate (smooth or rough, rigid or erodible) and the bead size. Two different flow regimes leading to three different deposit morphologies are observed as a function of the initial aspect ratio a, whatever the substrate properties and the bead size. For a≲3, the granular mass spreads through an avalanche on its flanks producing either truncated cone or conical deposits. For a≳3, the upper part of the column descends conserving its shape while the foot of the pile propagates radially outward. The obtained deposit looks like a “Mexican hat” and the slope angle at the foot of the deposit is observed to saturate at a value of the order of 5°. For a given ground and bead size, the flow dynamics and the deposit morph...read more
Citations
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Journal ArticleDOI
Flows of Dense Granular Media
Yoël Forterre,Olivier Pouliquen +1 more
TL;DR: In this article, the existence of a dense flow regime characterized by enduring contacts is discussed, and results from experiments and simulations in different configurations support a description in terms of a frictional visco-plastic constitutive law.
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A review on the angle of repose of granular materials
TL;DR: In this paper, an extensive review about the angle of repose angle theory, its definitions, method of measurements, appropriate applications and the influencing factors are presented. But, the authors do not consider the effect of the inter-particle properties of granular materials.
Book
Granular Media: Between Fluid and Solid
TL;DR: In this article, the granular solid: statics and elasticity of granular liquid and granular gases are discussed at the grain level, and the interaction between granular media, statics, elasticity and plasticity at the liquid level.
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Turbidity Currents and Their Deposits
Eckart Meiburg,Ben Kneller +1 more
TL;DR: A survey of the current state of the art on turbidity currents with an emphasis on their fluid mechanics is presented in this paper, highlighting the significant role these currents play within the global sediment cycle, and their importance in environmental processes and in the formation of hydrocarbon reservoirs.
Journal ArticleDOI
The granular column collapse as a continuum: validity of a two-dimensional Navier–Stokes model with a μ(I)-rheology
TL;DR: In this article, a Navier-Stokes solver is used to simulate the column collapse of granular columns over a wide range of aspect ratios in the case of a steady infinite two-dimensional granular layer avalanching on an inclined plane.
References
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Journal ArticleDOI
The physics of debris flows
TL;DR: In this paper, a simple model that satisfies most of these criteria uses depth-averaged equations of motion patterned after those of the Savage-Hutter theory for gravity-driven flow of dry granular masses but generalized to include the effects of viscous pore fluid with varying pressure.
Journal ArticleDOI
On dense granular flows.
TL;DR: A quantitative comparison between data coming from different experiments in the same geometry identifies the robust features in each case and a transverse analysis of the data across the different configurations allows to identify the relevant dimensionless parameters, the different flow regimes and to propose simple interpretations.
Journal ArticleDOI
The motion of a finite mass of granular material down a rough incline
Stuart B. Savage,Kolumban Hutter +1 more
TL;DR: In this article, two similarity solutions are found for the motion of a finite mass of material released from rest on a rough inclined plane, and the linear stability of the similarity solutions is studied.
Journal ArticleDOI
The mobility of long-runout landslides
TL;DR: In this article, it was shown that the apparent coefficient of friction (ratio of the fall height to the runout distance) commonly used to describe landslide mobility is physically meaningless.
Journal ArticleDOI
Scaling laws in granular flows down rough inclined planes
TL;DR: In this paper, the scaling properties of granular flows down rough inclined planes are presented based on the measurement of the minimum thickness hstop(θ) necessary to observe a steady uniform flow at inclination θ.