Effects of material properties on the mobility of granular flow

In this study, we investigate the influence of material properties on the mobility of granular flow through granular column collapse experiments using the Smooth Particle Hydrodynamics method and a continuum constitutive model capable of describing the nonlinear responses of granular materials. Nume...

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Bibliographic Details
Published in:Granular matter 2020-08, Vol.22 (3), Article 59
Main Authors: Nguyen, Nhu H. T., Bui, Ha H., Nguyen, Giang D.
Format: Article
Language:English
Subjects:
Columns (structural)
Complex Fluids and Microfluidics
Computational fluid dynamics
Computer simulation
Constitutive models
Density
Dilation
Empirical analysis
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid flow
Foundations
Friction
Geoengineering
Granular materials
Heat and Mass Transfer
Hydraulics
Industrial Chemistry/Chemical Engineering
Material properties
Materials Science
Mathematical models
Mathematical morphology
Modulus of elasticity
Original Paper
Physics
Physics and Astronomy
Poisson's ratio
Scaling laws
Smooth particle hydrodynamics
Soft and Granular Matter
Stiffness
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Summary:In this study, we investigate the influence of material properties on the mobility of granular flow through granular column collapse experiments using the Smooth Particle Hydrodynamics method and a continuum constitutive model capable of describing the nonlinear responses of granular materials. Numerical simulations are systematically compared with available experimental data and well-established empirical laws to validate the capability of this numerical approach for simulating the dynamics of granular flow. Based on this validation, a series of numerical experiments is conducted to investigate the effects of strength properties (i.e. friction and dilation), density and stiffness properties (i.e. Young’s modulus and Poisson’s ratio) on the run-out distance and energy evolution of granular flows, which were unclear or contradictorily reported in previous experimental studies. We found that as the friction angle increases, the material is less mobilised and hence the run-out distance is shorter. In addition, a denser state (i.e. more dilation) facilitates its mobilisation associated with a greater volume expansion during the collapse. The density and stiffness properties of granular materials, nonetheless, have negligible effects on the deposit morphology and run-out distance of granular flow. To further quantify the effects of material properties, the run-out scaling law of granular flow, which describes the relationship between the run-out distance and the initial geometry of granular columns, is analysed and shown to be significantly influenced by the friction and dilation of the materials.
ISSN:1434-5021
1434-7636
DOI:10.1007/s10035-020-01024-y