Modelling Internal Erosion with the Material Point Method

Yerro, Alba; Rohe, Alexander; Soga, Kenichi

doi:10.1016/j.proeng.2017.01.048

Cited by 37 publications

(17 citation statements)

References 26 publications

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“…Thus, the use of this type of law allows finding information in the viscous under layer. The value of the meshing criterion must therefore satisfy + ≈ 1 [17]. It can therefore be noted that the wall law approach can be less consuming in terms of calculation time and storage space depending on the degree of complexity of the law, the size of the first element being more important [17][18][19][20][21].…”

Section: Modelling Approach Of the Interface Erosionmentioning

confidence: 99%

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Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

et al. 2021

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In the area of civil engineering and especially hydraulic structures, we find multiple anomalies that weakens mechanical characteristics of dikes, one of the most common anomalies is erosion phenomenon specifically pipe flow erosion which causes major damage to dam structures. This phenomenon is caused by a hole which is the result of the high pressure of water that facilitate the soil migration between the two sides of the dam. It becomes only a question of time until the diameter of the hole expands and causes destruction of the dam structure. This problem pushed physicist to perform many tests to quantify erosion kinetics, one of the most used tests to have logical and trusted results is the HET (hole erosion test). Meanwhile there is not much research regarding the models that govern these types of tests. Objectives: In this paper we modeled the HET using modeling software based on the Navier Stokes equations, this model tackles also the singularity of the interface structure/water using wall laws for a flow turbulence. Methods/Analysis: The studied soil in this paper is a clay soil, clay soil has the property of containing water more than most other soils. Three wall laws were applied on the soil / water interface to calculate the erosion rate in order to avoid the rupture of such a structure. The modlisitation was made on the ANSYS software. Findings: In this work, two-dimensional modeling was carried of the soil.in contrast of the early models which is one-dimensional model, the first one had shown that the wall-shear stress which is not uniform along the whole wall. Then using the linear erosion law to predict the non-uniform erosion along the whole length. The previous study found that the wall laws have a significant impact on the wall-shear stress, which affects the erosion interface in the fluid/soil, particularly at the hole's extremes. Our experiment revealed that the degraded profile is not uniform. Doi: 10.28991/cej-2021-03091742 Full Text: PDF

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Section: Modelling Approach Of the Interface Erosionmentioning

confidence: 99%

“…In the case where the above coefficients, α, þ and y are all equal to zero, the relation ( 3) admits as solution a classical logarithmic wall law [17][18][19][20][21].…”

Section: Enhanced Wall Treatmentmentioning

confidence: 99%

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

et al. 2021

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“…Based on the model proposed by Mahadevan et al, Ameen and Taleghani [22] have studied the effect of injection rate, fluid viscosity, and rock properties on channel formation during fluid injection. Yerro et al [23] attempted to use the material point method to model internal erosion process in bimodal internally unstable soils, which assumes that erosion rate is proportional to the velocity difference between fluid and solids. They performed a numerical test consisting of a soil column subjected to a vertical water flow and observed that the fine grains can be eroded and are able to move freely through the stable skeleton of the soil.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Channelization Near the Wellbore due to Seepage Erosion in Unconsolidated Sands during Fluid Injection

Sun

Deng

et al. 2021

Geofluids

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The channels may be formed in the unconsolidated sands reservoir due to formation failure during high-pressure water injection or frac-packing. Based on the continuum mechanics, a mathematical model has been established to simulate the formation process of big channels in unconsolidated sands reservoir during fluid injection. The model considers the effect of reservoir heterogeneity, solid particles erosion, and deposition. The dynamic formation process of channels around the borehole and its influencing factors are analyzed by this model. The results indicate that the seepage erosion plays a very significant role in the formation of the channels during fluid injection for the unconsolidated sands with extremely low strength. The formation of the channels is closely related to the duration of fluid injection, injection pressure, reservoir heterogeneity, formation plugging, and critical fluid velocity. The long channels are more likely to form as injection time increases. Higher injection pressure will lead to higher flow rate, thus eroding the solid particles and forming big channels. The increase of the rock strength will enhance the value of critical fluid velocity, which makes it difficult for the occurrence of erosional channelization. The near-wellbore damage of the formation will decrease the flow rate, and the preferential flow channels are less likely to be induced under the same injection pressure when compared with undamaged formation. In addition, we also found that the reservoir heterogeneity is essential to the formation of preferential flow channels. The channels are especially prone to be formed in the regions with high porosity and permeability at the initial time. The study can provide a theoretical reference for the optimal design of high-pressure water injection or frac-packing operation in the unconsolidated sands reservoir.

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“…The conventional computational fluid dynamics (CFD) software is developed to solve the Navier-Stokes equations for the simulation of the fluid phase. Several methods could be found in the literature to model the fluid flow, such as the material particle method (MPM) [25], smoothed particle hydrodynamics (SPH) [19] and the lattice Boltzmann method (LBM) [26]. These methods could only provide the continuum-scale information and lacked the particle-scale information of granular materials.…”

Section: Introductionmentioning

confidence: 99%

CFD–DEM Simulations of Seepage-Induced Erosion

Xiao

Wang

2020

Water

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Increases in seepage force reduce the effective stress of particles and result in the erosion of particles, producing heave failure and piping. Sheet piles/cutoff walls are often employed in dams to control the seepage. In this study, a computational fluid dynamics solver involving two fluid phases was developed and coupled with discrete element method software to simulate the piping process around a sheet pile/cutoff wall. Binary-sized particles were selected to study the impact of fine particles on the mechanisms of seepage. The seepage phenomenon mainly appeared among fine particles located in the downstream side, with the peak magnitudes of drag force and displacement occurring around the retaining wall. Based on the particle-scale observations, the impact of seepage produced a looser condition for the region concentrated around the retaining wall and resulted in an anisotropic condition in the soil skeleton. The results indicate that heave behavior occurs when the drag force located adjacent to the boundary on the downstream side is larger than the corresponding weight of the bulk soil.

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Modelling Internal Erosion with the Material Point Method

Cited by 37 publications

References 26 publications

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

Numerical Simulation of Channelization Near the Wellbore due to Seepage Erosion in Unconsolidated Sands during Fluid Injection

CFD–DEM Simulations of Seepage-Induced Erosion

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