Contribution aux méthodes de cut-cells pour la CFD : La méthode LS-STAG pour les fluides visqueux incompressibles
Application de la mécanique des fluides numérique pour évaluer et optimiser la performance d’un chenal à haut rendement ...
In a well-mixed condition, High Rate Algal Pond (HRAP) is one of the most appropriate ways for algal biomass production. This study is interested in the effect of the hydrodynamics inside a lab-scale HRAP that plays an important role to realize proper mixing. Computational Fluid Dynamics has proven itself to offer the possibilities of understanding...
Application of numerical simulation for a better characterization of red blood cells by impedance measurement
In Coulter counters, cells counting and volumetry is achieved by monitoring their electrical print when they flow through a polarized micro-orifice.However, the volume measurement may be impaired when the trajectory of the cell is in the vicinity of the aperture edges due to complex dynamics and deformations of the cell.In this thesis, numerical si...
Embedded and high-order meshes : two alternatives to linear body-fitted meshes
The numerical simulation of complex physical phenomena usually requires a mesh. InComputational Fluid Dynamics, it consists in representing an object inside a huge control volume.This object is then the subject of some physical study. In general, this object and its boundingbox are represented by linear surface meshes and the intermediary zone is f...
Embedded and high-order meshes : two alternatives to linear body-fitted meshes
The numerical simulation of complex physical phenomenons usually requires a mesh. In Computational Fluid Dynamics, it consists in representing an object inside a huge control volume. This object is then the subject of some physical study. In general, this object and its bounding box are represented by linear surface meshes and the intermediary zone...
Modeling and high performance numerical simulation ofcomplex fluid flows
Secondary settling tanks modeling : study of the dynamics of activated sludge sedimentation by computational fluids dyna...
The conventional activated sludge process is the most widely used process for treating urban wastewater. Biomass (activated sludge) grows and forms biological flocs that must be separated from the treated water. This is usually performed by gravity in a clarifier. Activated sludge particles are subject to different settling processes, depending on ...
La méthode LS-STAG avec schémas diamants pour l'approximation de la diffusion : une méthode de type "cut-cell" précise e...
La méthode LS-STAG est une méthode cartésienne pour le calcul d’écoulements incompressibles en géométries complexes, qui propose une discrétisation précise des équations de Navier-Stokes dans les cut-cells, cellules polyédriques de forme complexe créées par l’intersection du maillage cartésien avec la frontière du solide immergé. Originalement déve...
Étude de la dispersion de nanoparticules dans le sillage d’obstacles : cas d’un véhicule automobile
Dans cette thèse, l’étude des interactions entre des particules ultrafines émises par les pots d’échappement et l’écoulement de sillage créé par le véhicule émetteur a été réalisée principalement selon une approche numérique. Une campagne expérimentale a été conduite à des fins de validation. L’objet de la thèse vise à comprendre l’impact des parti...
On the Determination of the Yield Surface within the Flow of Yield Stress Fluids using Computational Fluid Dynamics
A part of non-Newtonian fluids are yield stress fluids. They require a minimum stress to flow. Below this minimum value, yield stress fluids remain solid. To date, 1D and 2D numerical models have been used predominantly to study free surface flows. However, some phenomena have three-dimensional behaviour such as the appearance of the limit between ...
