Coupled CFD–DEM Investigation of Erosion Accompanied by Clogging Mechanism under Different Hydraulic Gradients

Mu, Linlong; Zhang, Peiyun; Shi, Zhenhao; Huang, Maosong

doi:10.1016/j.compgeo.2022.105058

Cited by 25 publications

(2 citation statements)

References 76 publications

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“…To deal with large fluid-particle systems, the unresolved CFD-DEM [24,25] is the appropriate approach, in which the particle size is markedly smaller than the size of cells in the fluid phase to ensure the computational efficiency [26,27]. For example, the internal erosion of soil induced by seepage has been successfully investigated according to this unresolved approach [19,[28][29][30]. However, the flow around each particle cannot be fully resolved in the framework of the unresolved method, which is approached by solving the locally volume-averaged NS equations [28,31,32], resulting in a coarse-scale simulation of fluid-particle interaction.…”

Section: Introductionmentioning

confidence: 99%

Resolved CFD-DEM Simulation of Free Settling of Polyhedral Particles with Various Orientations: Insights Provided by Oscillation Behavior in Quiescent Liquid

Zhang,

Qiu,

Xiong

et al. 2023

JMSE

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Particle settling is the process by which particulates move toward the bottom of a liquid, which can affect the sediment transport and energy balance of marine systems. However, the deficiency in understanding the resolved fluid–particle interactions with complex boundaries in the settling process awaits resolution. This study employs a hybrid approach that combines computational fluid dynamics (CFD) with the discrete element method (DEM) to fully simulate the free-settling behavior of polyhedral particles in water. The accuracy of the method is verified by comparing numerical results with experimental data of ellipsoidal particle settling. Two series of tests with horizontal and vertical particle release directions are established to investigate the effects of particle shape features, such as the aspect ratio (AR) and corner (C), on the particles’ mechanical behavior and hydrodynamic characteristics. The results demonstrate that particle shape exerts a substantial influence on fluid resistance, rotational motion, and fluid disturbance throughout the settling process. The maximum velocities in vertically released cases are roughly 1.2–1.3 times greater than those in horizontally released cases. The study highlights the potency of the resolved CFD-DEM method as a robust technique for comprehending fluid–particle phenomena within the marine geotechnical engineering, including sedimentation and erosion of seabed sediments.

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Section: Introductionmentioning

confidence: 99%

Resolved CFD-DEM Simulation of Free Settling of Polyhedral Particles with Various Orientations: Insights Provided by Oscillation Behavior in Quiescent Liquid

Zhang,

Qiu,

Xiong

et al. 2023

JMSE

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show abstract

“…In recent decades with the rapid development of computer technology, fluid simulation technology based on the DEM has become an important method for many researchers to study seepage or multiphase flow problems [17][18][19], which provides a powerful reference for the study of the microscopic mechanisms of fluid flow and other coupling problems [20][21][22]. At present, the fluid-structure coupling methods based on discrete element theory are mainly divided into the traditional computational fluid dynamics (CFD) method based on the Euler grid [23], the smooth particle fluid dynamics (SPH) method based on Lagrange particles [24], and the mesoscopic lattice Boltzmann method (LBM) [25].…”

Section: Introductionmentioning

confidence: 99%

Experimental and DEM-CFD Coupling Investigations on the Characteristics and Mechanism of Seepage Erosion for Cohesionless Soil

Su,

Dai,

Zhang

et al. 2023

Water

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Seepage erosion is one of the main reasons for the local collapse or instability of embankments. To investigate the characteristics and mechanism of seepage erosion for cohesionless soils, model tests using an independently developed seepage erosion device and numerical simulations based on a discrete element method-computational fluid dynamics (DEM-CFD) coupling model were carried out. The results show that the seepage erosion process of cohesionless soil could be characterized by four stages: stable seepage, upward migration of fine particles, boiling of sand samples, and erosion damage. The skeleton structure of a soil sample under seepage flow was continually changed due to the loss of fine soil particles, which resulted in a significant decrease in the sample strength and could, ultimately, lead to the failure of the sample. The results of this study can provide references and bases for the design, construction, and long-term service of embankments or earth dams under complex seepage conditions, reducing the risk of seepage erosion.

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Influences of particle size ratio and fines content on the suffusion characteristics of gap-graded soils

Zhao,

Hu,

Zheng

et al. 2024

Granular Matter

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Coupled CFD–DEM Investigation of Erosion Accompanied by Clogging Mechanism under Different Hydraulic Gradients

Cited by 25 publications

References 76 publications

Resolved CFD-DEM Simulation of Free Settling of Polyhedral Particles with Various Orientations: Insights Provided by Oscillation Behavior in Quiescent Liquid

Resolved CFD-DEM Simulation of Free Settling of Polyhedral Particles with Various Orientations: Insights Provided by Oscillation Behavior in Quiescent Liquid

Experimental and DEM-CFD Coupling Investigations on the Characteristics and Mechanism of Seepage Erosion for Cohesionless Soil

Influences of particle size ratio and fines content on the suffusion characteristics of gap-graded soils

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