Simulation of dredged sediment releases into homogeneous water using a two-phase model

Nguyen, Duc Hau; Levy, Florence; Bang, Damien Pham Van; Guillou, Sylvain; Nguyen, Kim Dan; Chauchat, Julien

doi:10.1016/j.advwatres.2012.03.009

Cited by 24 publications

(28 citation statements)

References 17 publications

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“…The interactions between solid phases, between water and solid phases, between settling and turbulence and the presence of air bubbles in plumes are examples of topics subject to intense research. A remarkably large variety of governing equations used to describe sediment/water mixtures can be found in the literature (Jiang et al, 1997;Shakibaeinia and Jin, 2012;Nguyen et al, 2012 andSaremi, 2014), reflecting that a common perception of the near-field system has not yet converged within the research community. For instance, it is common in some types of mathematical models to treat the sediment-water mixture as a fluid with varying density; the density corresponding to the local fractions of water and sediment.…”

Section: Introductionmentioning

confidence: 98%

Field experimental observations of highly graded sediment plumes

Jensen

Saremi

Jiménez

et al. 2015

Marine Pollution Bulletin

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Section: Introductionmentioning

confidence: 98%

Field experimental observations of highly graded sediment plumes

Jensen

Saremi

Jiménez

et al. 2015

Marine Pollution Bulletin

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“…A similar transport equations can be used to describe the transport of solid particles based on volumetric fraction, and this coupled method is called Two Fluid Method (TFM). The performance of this method has been verified by experimental observations (Bouillard et al 1989;Nguyen et al 2009;Nguyen et al 2012;Shah et al 2013). An advantage of TFM is the easy implementation of different fluid models, especially for turbulent flows (Dadashi et al 2014;Patro and Dash 2014).…”

Section: Introductionmentioning

confidence: 79%

Analysis of surface erosion of cohesionless soils using a three-dimensional coupled computational fluid dynamics – discrete element method (CFD–DEM) model

Guo

2019

Can. Geotech. J.

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A fluid–solid interaction model has been implemented by coupling two numerical methods — computational fluid dynamics (CFD) and discrete element method (DEM) — that capture the mesoscale behaviors of the fluid–solid system. The model is first validated by comparing the results of simulations with two types of experiments: free settling of a single sphere in water and formation of angle of repose of particles under water, which show its capability in modeling the behaviors of both particle phase and fluid phase. The verified model is then used to study factors affecting the soil erodibility, where case studies are designed for soil particles deposited inside a pipe and subsequently subjected to water flow–induced surface erosion. Influencing factors for soil erodibility, including particle diameter and interparticle bond, are analyzed. For cohesionless soils without bond strength, the critical shear stress is found to be linearly related to particle size; while for soils with bond strength, simulation results show that interparticle bonding largely decelerates the erosion process and causes a much lower erosion rate. To further the understanding of soil surface erosion under turbulent flow, the “k–ε” turbulence model has been successfully implemented for the fluid phase. Comparison between the laminar model and the turbulence model shows turbulence significantly accelerates the erosion process.

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“…However no direct application to sedimentation-consolidation of the two-phase model has been presented in the literature. Recently, first applications of two-phase model for fine-sediment transport in ECZs have been published (Hsu et al 2007;Nguyen et al 2009;Torres-Freyermuth and Hsu 2010;Nguyen et al 2012). The results obtained in these studies have shown the potential of this modelling approach and also the needs for process oriented studies to determine the adequate closure laws for cohesive sediments.…”

Section: Introductionmentioning

confidence: 99%

Modelling sedimentation–consolidation in the framework of a one-dimensional two-phase flow model

Chauchat

Guillou

Bang

et al. 2013

Journal of Hydraulic Research

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A one-dimensional vertical two-phase flow model for sedimentation-consolidation process is presented. The model is based on solving the continuity and momentum equations for both fluid and solid phases. In the non-cohesive case, the momentum transfer between the two phases is reduced to the drag force around a single particle modified to take the hindrance effects into account. In the cohesive case, Darcy-Gersevanov's law is used for the closure of the momentum transfer between the two phases and the concept of "effective stress" is introduced to take into account the bed structuring. These closure laws are validated against high resolution experimental data in terms of settling curves and concentration profiles. The reliability of the model is illustrated from an analysis of the momentum balances at different stages during the process. Finally, the proposed closure laws and numerical algorithms are shown to be able to quantitatively reproduce sedimentation of non-cohesive and sedimentationconsolidation of cohesive sediments, including mud.

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Simulation of dredged sediment releases into homogeneous water using a two-phase model

Cited by 24 publications

References 17 publications

Field experimental observations of highly graded sediment plumes

Field experimental observations of highly graded sediment plumes

Analysis of surface erosion of cohesionless soils using a three-dimensional coupled computational fluid dynamics – discrete element method (CFD–DEM) model

Modelling sedimentation–consolidation in the framework of a one-dimensional two-phase flow model

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