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<dc:title xml:lang="fr">Approche Euler-Lagrange pour la modélisation du transport solide dans les ouvrages de décantation</dc:title>
<dcterms:alternative xml:lang="en">Euler-Lagrange approach to simulate sediment transport in settlers</dcterms:alternative>
<dc:subject xml:lang="fr">Approche Euler-Lagrange</dc:subject>
<dc:subject xml:lang="fr">Suivi de particules</dc:subject>
<dc:subject xml:lang="fr">Transport solide</dc:subject>
<dc:subject xml:lang="fr">Décantation</dc:subject>
<dc:subject xml:lang="fr">Matières en suspension</dc:subject>
<dc:subject xml:lang="fr">Abattement</dc:subject>
<dc:subject xml:lang="fr">Modèle numérique</dc:subject>
<dc:subject xml:lang="fr">CFD</dc:subject>
<dc:subject xml:lang="fr">Pilote échelle 1</dc:subject>
<dc:subject xml:lang="fr">Zones préférentielles de dépôts</dc:subject>
<dc:subject xml:lang="en">Euler-Lagrange approach</dc:subject>
<dc:subject xml:lang="en">Particle tracking</dc:subject>
<dc:subject xml:lang="en">Sediment transport</dc:subject>
<dc:subject xml:lang="en">Sedimentation</dc:subject>
<dc:subject xml:lang="en">Suspended solids</dc:subject>
<dc:subject xml:lang="en">Settling efficiency</dc:subject>
<dc:subject xml:lang="en">Numerical model</dc:subject>
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<dc:subject xml:lang="en">One-scale pilot</dc:subject>
<dc:subject xml:lang="en">Spatial distribution of sediments</dc:subject>
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<tef:elementdEntree autoriteExterne="027838323" autoriteSource="Sudoc">Théorie du transport</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029332516" autoriteSource="Sudoc">Équations d'Euler-Lagrange</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027839982" autoriteSource="Sudoc">Analyse par sédimentation</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="196677807" autoriteSource="Sudoc">Dynamique hydro-sédimentaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’objectif de cette thèse est le développement et la validation d’un outil numérique permettant d’évaluer la performance d’un ouvrage de décantation. L’approche Euler-Lagrange est retenue pour la modélisation de l’écoulement et du transport solide. De nouvelles conditions d’interaction particule/paroi permettent de restreindre le dépôt aux zones présentant des caractéristiques géométriques et hydrodynamiques favorables. Le modèle numérique est confronté à quatre jeux de données expérimentales. L’ensemble de ces expérimentations permettent d’investiguer une large gamme des paramètres représentatifs de l’écoulement et du transport solide. La comparaison des résultats numériques et expérimentaux permet de conclure sur la capacité du modèle à prévoir l’abattement des particules dans un ouvrage de décantation avec une précision de l’ordre de 5 pourcents lorsque les dépôts ont lieu sur l’ensemble du fond et de 10 pourcents dans le cas de dépôts localisés dans des zones préférentielles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The objective of this thesis is the development and the validation of a numerical tool to estimate the trapping efficiency of settlers. The Euler-Lagrange approach is chosen to simulate the flow and the sediment transport. New particle/wall interaction conditions are developed to take into account the geometric and hydrodynamic characteristics to enable the deposit. The numerical model is compared to four sets of experimental data. All these experiments enable to study a wide range of parameters that describe the flow and the solid transport. The comparison between the numerical and experimental results shows that the model is able to estimate the trapping efficiency of particles in a settler with an accuracy of about 5 percent when the particles settle all over the bed of the basin and about 10 percent in case of located deposits.</dcterms:abstract>
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