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Open AccessArticle

Numerical Simulation of the Fluid–Solid Coupling Mechanism of Internal Erosion in Granular Soil

1
State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China
2
School of Civil Engineering, Xijing University, Xi’an 710123, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(1), 137; https://doi.org/10.3390/w12010137
Received: 12 November 2019 / Revised: 27 December 2019 / Accepted: 27 December 2019 / Published: 1 January 2020
(This article belongs to the Section Hydraulics)
Internal erosion involves migration and loss of soil particles due to seepage. The process of fluid–solid interaction is a complex multiphase, coupled nonlinear dynamic problem. In this study, we used Particle Flow Code (PFC3D, three-dimensional PFC) software to model solid particles, and we applied computational fluid dynamics (CFD) and the coarse mesh element method to solve the local Navier–Stokes equations. An information-exchange process for the PFC3D and CFD calculations was used to achieve fluid–solid coupling. We developed a numerical model for internal erosion of the soil and conducted relevant experiments to verify the usability of the numerical model. The mechanism of internal erosion was observed by analyzing the evolution of model particle migration, contact force, porosity, particle velocity, and mass-loss measurement. Moreover, we provide some ideas for improving the calculation efficiency of the model. This model can be used to predict the initiation hydraulic gradient and skeleton-deformation hydraulic gradient, which can be used for the design of internal erosion control. View Full-Text
Keywords: internal erosion; seepage flow; PFC3D; CFD; numerical; two-phase flow internal erosion; seepage flow; PFC3D; CFD; numerical; two-phase flow
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MDPI and ACS Style

Wang, Y.; Chai, J.; Xu, Z.; Qin, Y.; Wang, X. Numerical Simulation of the Fluid–Solid Coupling Mechanism of Internal Erosion in Granular Soil. Water 2020, 12, 137.

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