A new SPH-based approach to simulation of granular flows using viscous damping and stress regularisation

The smoothed particle hydrodynamics (SPH) method was recently extended to simulate granular materials by the authors and demonstrated to be a powerful continuum numerical method to deal with the post-flow behaviour of granular materials. However, most existing SPH simulations of granular flows suffe...

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Bibliographic Details
Published in:Landslides 2017-02, Vol.14 (1), p.69-81
Main Authors: Nguyen, Cuong T., Nguyen, Chi T., Bui, Ha H., Nguyen, Giang D., Fukagawa, Ryoichi
Format: Article
Language:English
Subjects:
Accuracy
Agriculture
Civil Engineering
Computer simulation
Continuums
Earth and Environmental Science
Earth Sciences
Fluid dynamics
Geography
Granular materials
Hydrodynamics
Landslides & mudslides
Mathematical models
Natural Hazards
Original Paper
Stresses
Viscosity
Viscous damping
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Summary:The smoothed particle hydrodynamics (SPH) method was recently extended to simulate granular materials by the authors and demonstrated to be a powerful continuum numerical method to deal with the post-flow behaviour of granular materials. However, most existing SPH simulations of granular flows suffer from significant stress oscillation during the post-failure process, despite the use of an artificial viscosity to damp out stress fluctuation. In this paper, a new SPH approach combining viscous damping with stress/strain regularisation is proposed for simulations of granular flows. It is shown that the proposed SPH algorithm can improve the overall accuracy of the SPH performance by accurately predicting the smooth stress distribution during the post-failure process. It can also effectively remove the stress oscillation issue in the standard SPH model without having to use the standard SPH artificial viscosity that requires unphysical parameters. The predictions by the proposed SPH approach show very good agreement with experimental and numerical results reported in the literature. This suggests that the proposed method could be considered as a promising continuum alternative for simulations of granular flows.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-016-0681-y