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

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• 作者：Cuong T. Nguyen ; Chi T. Nguyen ; Ha H. Bui ; Giang D. Nguyen ; Ryoichi Fukagawa
• 关键词：SPH ; Granular flow ; Granular column ; Failure mechanism
• 刊名：Landslides
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：14
• 期：1
• 页码：69-81
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Natural Hazards; Geography, general; Agriculture; Civil Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-5118
• 卷排序：14

文摘

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.