Dissertations / Theses on the topic 'Écoulement en milieux poreux'
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Hume, Laurène. "Approche numérique d'écoulements complexes à l'échelle des pores en milieux poreux." Thesis, Pau, 2018. http://www.theses.fr/2018PAUU3011/document.
Full textThis scientific computing work presents an iterative method for the solution of incompressibleStokes equation at the pore scale of porous media. This method is based on solid matrixpenalization and involves vorticity field. We adapt tools from vortex methods (generally used forexternal and transport-dominant flows) to viscous flows at low scale.The pore space flow is computed with this iterative method, alternating penalization anddiffusion steps. Only usual operators are used in the proposed formulation, such that the nonseparableproperty of the penalization-diffusion initial equation is overcome. We then performhigh resolution and low memory storage simulations on various geometries, including real porousmedia. We validate the code with these results, and by estimating permeability of samples.From this work which consists in no-slip flow at solid interface, we propose a generalizationto rough solid walls at the interface. This thesis presents the modeling of such roughness usinga tangential slip Robin condition, and the ensuing method as a computation of the resultingperturbation.This work also includes a study of variable viscosity flows. With a particle-based method,we present the numerical solution of a non-linear Stokes problem coupled with diffusion andtransport for xanthan flow in a Bentheimer sandstone. The viscosity law is a Carreau law, asxanthan solution is a shear-thinning substance : the method is then able to handle high viscosityvariations. About the same topic of variable viscosity flows, and more precisely about mixturehomogenization, we introduce a theoretical estimator of effective viscosity for random mixtures.This estimator is validated on a large number of Stokes simulation, with a methodology inspiredby Monte-Carlo methods
Hourtané, Virginie. "Écoulement de mousse dans des modèles de milieux poreux." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0330/document.
Full textCrude oil is already usually trapped into heterogeneous porous media. In order to increase the recovery efficiency, one of the chemical solutions consists in injecting foams in porous media to expel oil from the rock. Foam is indeed able in some cases to greatly decrease the mobility, leading to a better sweeping of the reservoir. However, the mechanisms controlling the foam mobility are not well known. We propose a microfluidic approach allowing a direct observation of the flow of bubbles in a model of porous media. We observe that the flow is not homogeneous in the porous medium: it is concentrated in some paths. The number of these preferential paths depends of the foam quality and the capillary number. If we simplify the geometry of the porous medium to a loop, we prove that the formation of preferential paths depends of the size of the loop. Indeed we can only immobilize the bubbles if the size of the loop is around the size of the bubbles
Zeltz, Eric. "Modélisations d'injections multiphasiques en milieux poreux." Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0027/these.pdf.
Full textBy using the mathematical techniques of homogenization and by starting from the Navier-Stokes equations, we model the injection of fuids in porous medium in three different cases. - First, in the case of a compressible fluid: we recover the model of Aronson. -then in the case of an incompressible fluid injected in the porous medium filled with another incompressible fluid. We demonstrate that the interface is determined by a problem of Riemann and that its average speed is linear. We show that the nature of the interface is essentially de fined by the coefficient of mobility of both fluids. We validate the model thanks to an experience of injection of resin in a porous medium. We use our model to interpret a known physical phenomenon but in our knowledge never explained in satisfactory way: the headway of the interface along the walls of the porous mould in the case of the injection of a very sticky fluid. - Finally we consider the previous case when the injected uid is condensable. We demonstrate again that the interface is determined by a Riemann problem but that its speed goes asymptotically towards zero. We validate our model with an experience of vapor injected in some concrete. We give a new explanation to a phenomenon classically called " phenomenon of cork " and observed in this type of experience
Panfilova, Irina. "Ecoulements diphasiques en milieux poreux : modèle de ménisque." Vandoeuvre-les-Nancy, INPL, 2003. http://docnum.univ-lorraine.fr/public/INPL_T_2003_PANFILOVA_I.pdf.
Full textA new macroscopic model of two-phase flow through porous media is suggested. It takes in consideration a typical structure of phase distribution in pores in the form of a repetitive field of mobile menisci. The presence of such interfaces givers rise to a supplementary term in the momentum balance equation, which introduces a vector field of capillary forces. The derivation of the model is based on the phenomenological approach with introducing a special continuum called the Meniscus-continuum. The closure relations to the phenomenological model are obtained by numerical simulations in network models of porous media. The new model remains hyperbolic even when the capillary forces are dominant, in contrast with the classical model which is parabolic. Analytical solutions to the mono-dimensional flow problems are constructed. They manifest non-classical structures like the double fronts or counter-flow fronts. To simulate 2D or 3D problems, a numerical algorithm is developed, which is a combination between the finite difference and the percolation techniques. Its application to the p:roblem of DNAPL propagation into the soil has enabled to detect several penetration regimes
Serres, Marion. "Étude hydrodynamique d'un écoulement gaz-liquide dans un milieu poreux confiné." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN018/document.
Full textThis thesis focuses on gas-liquid flow in porous media, a common problem encountered in various domains from fundamental physics to applied chemical engineering. We have characterized the hydrodynamic regimes based on two different experimental devices geometry: a millichannel (1D flow) and a Hele-Shaw cell (2D flow). The originality of this work is to analyze the influence of the porous medium (monodisperse micro-packed beds or open cell solid foams), confinement (1D/2D) and gravity by coupling global and local analysis from either chemical engineering or fundamental physics community. On the one hand, a global analysis made it possible to quantify pressure drops, residence time distributions (RTD) based on fluorescent dye transport and gas-liquid mass transfer on the 1D device. On the other hand, a local analysis of the liquid fraction and the spatio-temporal evolution of its frequency pointed out the existence of two hydrodynamic regimes: a Taylor-like regime in which the characteristics of the periodic flow upstream are conserved in the porous medium and a modulated regime characterized by the flow disorganization at the porous medium entrance. A phenomenological model is developed based on bubbles propagation inside the medium and reproduces well both regimes. These two analyses are finally coupled to study multiphase flows inside the Hele-Shaw cell. The effects of gravity and confinement are discussed
Cancès, Clément. "Ecoulements diphasiques en milieux poreux hétérogènes : modélisation et analyse." Aix-Marseille 1, 2008. http://www.theses.fr/2008AIX11016.
Full textHoang, Ha. "Modélisation du comportement et des couplages HMC des milieux poreux." Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2090/document.
Full textModelling of the behavior and the couplings HMC of the porous circles
Saad, Bilal. "Modélisation et simulation numérique d'écoulements multi-composants en milieux poreux." Ecole centrale de Nantes, 2011. https://tel.archives-ouvertes.fr/tel-00649033v2.
Full textThis work deals with the modelization and numerical simulation of two phase multi-component flow in porous media. The study is divided into two parts. First we study and prove the mathematical existence in a weak sense of two degenerate parabolic systems modeling two phase (liquid and gaz) two component (water and hydrogen) flow in porous media. In the first model, we assume that there is a local thermodynamic equilibrium between both phases of hydrogen by using the Henry’s law. The second model consists of a relaxation of the previous model : the kinetic of the mass exchange between dissolved hydrogen and hydrogen in the gaz phase is no longer instantaneous. The second part is devoted to the numerical analysis of those models. Firstly, we propose a numerical scheme to compare numerical solutions obtained with the first model and numerical solutions obtained with the second model where the characteristic time to recover the thermody-namic equilibrium goes to zero. Secondly, we present a finite volume scheme with a phase-by-phase upstream weighting scheme without simplified assumptions on the state law of gas densities. We also validate this scheme on a 2D test cases
Ene, Ioana-Andreea. "Etude de quelques problèmes d'écoulement dans les milieux poreux." Metz, 1995. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1995/Ene.Ioana_Andreea.SMZ9553.pdf.
Full textThe aim of this thesis is the study of two problems of flow through porous media. In the first and the second chapter we study in the general framework of the homogenization method the flow of a viscous fluid through an elastic thin porous media. After the proof of the convergence of the homogenization process by using the two-scale convergence method it is possible to take the limit as the second small parameter (who caracterize the thickness of the solid part) tends to zero. We obtain a viscoelastic media with fading memory. We consider the two classical cases, when we have a Stokes flow in the fluid part and when we have a Navier-Stokes flow in the fluid part. In the third chapter we study a double porosity model in a double periodicity media. From a mechanical point of view this model represents a fracturated porous media. From a mathematical point of view we study a Neumann problem with double periodicity. We prove existence and unicity for such a problem and using the three-scale convergence method we obtain the homogenized equation and the homogenized coefficients. The result we obtain is a Darcy law at the macroscale and this show us that, at least in the steady case, both the double periodicity model and the double porosity model are the same
Chupin, Olivier. "Écoulement et transport couplés en milieux poreux saturés : application à l'injection des sols." Nantes, 2005. http://www.theses.fr/2005NANT2096.
Full textVinches, Corinne. "Études dynamiques de phases éponges diluées : écoulement en milieux poreux et mesures diélectriques." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10524.
Full textPaiola, Johan. "Écoulement d'un fluide à seuil dans un milieu poreux." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS031/document.
Full textElastic solids at rest, yield stress fluids flow like a liquid beyond a certain stress. Many industrial applications required the flow of these fluids in porous media, for example: the emulsion flow in oil recovery processes, the cementing operations in the ground, or the cleaning of sludge in a contaminated soil. For many applications, it could be interesting to know the pressure required for a desired flow rate. In such cases, the flow behavior of the fluid is complicated by the complexity of the geometry. The models developed to describe Darcy's law assume a rheological law applied locally, but these models poorly describe this type of flow. Furthermore, complex effects can be added like the wall slip or the thixotropy. In this thesis, we study the flow of carbopol (ETD 2050) through different geometries. First we show that the fluid, for some conditions, corresponds to model yield stress fluids. The experimental protocol used is very important and a thixotropic behavior can appear if it is not respected. This behavior appears especially when the fluid remains below the yield stress, the impact increases with the waiting time. We then compare the flow law obtained by rheometer in a straight channel obtained by microfabrication. We show the importance of the wall slip near the yield stress and the impact on the flow law. Finally, using a new method to measure the velocity fields developed during this thesis, we study the flow of carbopol in a porous medium. This porous medium of 5x5cm is obtained by microfabrication. The mean width of the channels is equivalent to the one of the straight channel. We show the emergence of a channeling flow through some channels of the porous medium. We then compare the flow law of the porous medium to the one obtained in the straight channel. It can be observed that the flow rate is lower in the porous medium than in the straight channel
Bonnet, Jean-Philippe. "Phénomènes de transport dans les mousses métalliques : approche expérimentale des écoulements monophasiques et liquide-gaz." Aix-Marseille 1, 2007. http://www.theses.fr/2007AIX11043.
Full textEl, Ossmani Mustapha. "Méthodes numériques pour la simulation des écoulements miscibles en milieux poreux hétérogènes." Pau, 2005. http://www.theses.fr/2005PAUU3005.
Full textIn this thesis, we are interested in numerical methods for a model of incompressible and miscible flows having application in hydrogeology and oil engineering. We study and analyze a numerical scheme combining a mixed finite element method (MFE) and a finite volumes method (FV) to discretize the coupled system between an elliptic equation (pressure-velocity) and a convection-diffusion-reaction equation (concentration). The FV scheme considered is "vertex centred" type semiimplicit in time: explicit for the convection and implicit for the diffusion. We use a Godunov scheme to approach the convectif term and a P 1 finite element approximation for the diffusion term. We prove that the FV scheme is La and BV stable and satisfy the discrete maximum principle under a suitable CFL condition. Then, we show the convergence of the approximate solution obtained by the combined scheme MFE-FV towards the solution of the coupled problem. The proof of convergence is done in several steps : first we deduce strong convergence of the approximate solution in L2(Q), using La stability, BV estimates and a compactness argument. In the second step we study the decoupled MFE scheme, by giving a convergence result for the pressure and velocity. In the final step, the process of convergence of the approximate solution of the combined scheme MFE-FV towards the exact solution is obtained by passing in the limit and uniqueness of the solution of the continuous problem. . . Finally, we analyze a residual error estimator for a convection-diffusion-reaction equation discretized by a semi-implicit finite volume. We introduce two kinds of indicators. The first is local in time and space and constitutes an effective tool for the adaptation of the grid to each time step. The second is total in space but local in time and can be used for the adaptation in time. The error etimators with respect to both time and space yield global upper and local lower bounds on the error measured in the energy norm. Numerical results of adaptations of grid are presented and show the effectiveness of the method. The software part of this work concerns two shutters. The first allowed to carry out an IMPES simulator, MFlow, written in C++, for the simulation of the system of miscible flows considered in this thesis. The second shutter relates to the collaboration with a group of researchers for the development of the Homogenizer++ platform realized within the framework of the GDR MoMaS (http://momas. Univ-lyon1. Fr/)
Pairoys, Fabrice. "Étude expérimentale et numérique des écoulements eau/huile dans les milieux poreux vacuolaires." Bordeaux 1, 2004. http://www.theses.fr/2004BOR12850.
Full textVugular porous media are found in many reservoirs especially those constituted of carbonate rocks where large cavities (called vugs) resulting from complex diagenetic processes are embedded in the porous matrix. Due to their structure, these porous materials have special transport properties and optimization of oil recovery from such reservoirs requires a good description of two-phase -oil and water- flow. Model vugular samples were obtained from a sandstone core, representing the continuum and homogeneous porous matrix through which cylindrical holes, representing the vugs, were drilled. Transparent windows, placed in front of the vugs allow a direct observation of the two-phase distribution and the evolution during flow. Due to the configuration, the flow is two-dimensional and saturation maps were obtained from local saturation measurement in the porous matrix using a ?-ray attenuation technique. During drainage and imbibition cycles, saturation, pressure and recovery measurements are performed. Using different density contrasts between oil and brine, the relative effect of viscous and gravity forces was investigated. Two-dimensional numerical simulations were performed on the experimental configuration using an industrial software. In our configuration, a heterogeneous generalized Darcy's model is tested. The vugular core was represented by a two-region medium corresponding to the matrix and vugs respectively. Petrophysical properties of the porous matrix were assigned by fitting experimental two-phase flow results obtained on a separate but similar homogeneous core -without vugs. In the region corresponding to the vugs, a zero capillary pressure was used while different sets of oil and water relative permeabilities were tested for comparison of pressure and saturation evolution on the vugular core with experimental data
Bendounan, Kada. "Analyse optique du processus de mélange dans les milieux poreux réalisés par photolithographie." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL098N.
Full textAdjallah, Condo Sèhoénou. "Écoulement d'air dans les milieux poreux granulaires : optimisation de la ventilation des silos à grains." Paris 12, 1994. http://www.theses.fr/1994PA120039.
Full textMarusic-Paloka, Eduard. "Modélisation par homogénéisation des écoulements en milieux poreux fissurés." Saint-Etienne, 1995. http://www.theses.fr/1995STET4008.
Full textFergui, Omar. "Ecoulements instationnaires de mousses en milieu poreux." Bordeaux 1, 1995. http://www.theses.fr/1995BOR10554.
Full textTrottier, Nicolas. "Modélisation des écoulement en milieux poreux fracturés : estimation des paramètres par approche inverse multi-échelle." Phd thesis, Université de Strasbourg, 2014. http://tel.archives-ouvertes.fr/tel-01037933.
Full textClerget, Mattéo. "Formation et destruction de mousse en écoulement dans un milieu confiné." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS493.
Full textFoam injection into porous media is a highly promising technique for a wide range of applications, including carbon dioxide storage, soil remediation, and enhanced oil recovery. The flow of this foam in a confined environment brings into play different processes of formation or destruction of the bubbles of which it is composed. Understanding the physical mechanisms of these processes is essential to improve this technique, in particular by optimizing the formulation of the liquid phase.Our approach is to decouple these different phenomena, using two-dimensional flow model devices, at the micro- or milli-fluidic scale. Their transparency allows us to visualize the structure of the flowing foam and to relate it to its macroscopic properties. Various surfactants and additives are systematically tested to investigate the ability of our devices to screen them, and the results obtained are systematically compared with those obtained in porous media.Our first experiment, which studies the formation of bubbles during the passage of a gas/liquid co-flow in a microfluidic pore, highlights a formation hysteresis phenomenon explained by a hydrodynamic feedback process initiated by the downstream flow. Using numerical simulations, we also demonstrate the existence of a limit to the quality of foam that can be formed, linked solely to the pore geometry. Different surfactants are investigated, and these results are compared with measurements both in volume and in three-dimensional porous media.Our second experiment studies the influence of an additive on this formation, in particular through the Marangoni effects it generates. A simple theoretical model is developed to account for these effects.Finally, we describe a millifluidic setup for observing and studying foam destruction by bubble coalescence. We show that the results vary drastically depending on the surfactants and additives used
Cochard, Thomas. "Injection de tensioactif pour la récupération assistée du pétrole : implication sur les lois régissant les écoulements eau-hydrocarbure-tensioactif en milieu poreux." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066647.
Full textThe main objective of the PhD is to study experimentally the oil mobilization using surfactant in a porous media below the residual oil saturation. At the residual oil saturation, the oil network is disconnected and organized in ganglia of different sizes and shapes all along the sample. This residual oil is difficult to produce in the classical conditions of water flooding because of capillary trapping created by the interfacial tension between oil and water. Injection of surfactant is able to mobilize the remaining oil at flow rates consistent with the real case of an oil mature reservoir. The use of surfactant allows lowering the interfacial tension by several orders of magnitude, towards ultra-low values (10-3 mN/m), strongly decreasing the capillary forces and so, mobilizing the oil. The first main study of the PhD work was to characterize the displacement of the surfactant injected in a sandstone sample in monophasic conditions (without oil). Breakthrough curves have been analyzed in term of dispersivity and adsorption. Experiments have shown that a better way to model the surfactant transport is to use a Langmuir kinetic adsorption model. For the diphasic case, we have developed a microfluidic 2D system with a random pore geometry of controlled conditions. The experiments are based on the injection of a small ganglia through a central channel, then, a surfactant flood is generated. The aim is to see how ganglia are displaced within the micromodel. New mechanisms have been identified and a way to model those phenomena has been proposed. A better understanding of surfactant and oil transport in porous media is key for chemical enhanced oil recovery processes
Ondami, Bienvenu. "Sur quelques problèmes d'homogénéisation des écoulements en milieux poreux." Pau, 2001. http://www.theses.fr/2001PAUU3002.
Full textDominguez, Armando. "Formation d'une phase gazeuse par décompression d'une solution binaire (liquide-gaz) en milieu poreux : étude expérimentale et modélisation sur milieux modèles." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT027G.
Full textLaquerie, Nathalie. "Simulation numérique d'un écoulement diphasique multicomposant en milieu poreux." Bordeaux 1, 1997. http://www.theses.fr/1997BOR10526.
Full textAmir, Laila. "Modèles couplés en milieux poreux : transport réactif et fractures." Phd thesis, Paris 9, 2008. https://bu.dauphine.psl.eu/fileviewer/index.php?doc=2008PA090061.
Full textThis thesis deals with numerical simulation of coupled models for flow and transport in porous media. We present a new method for coupling chemical reactions and transport by using a Newton-Krylov method, and we also present a model for in fractured media, based on a domain decomposition method that takes into account the case of intersecting fractures. This study is composed of three parts: the first part contains an analysis, and implementation, of various numerical methods for discretizing advection-diffusion problems, in particular by using operator splitting methods. The second part is concerned with a fully coupled method for modeling transport and chemistry problems. The coupled transport-chemistry model is described, after discretization in time, by a system of nonlinear equations. The size of the system, namely the number of grid points times the number a chemical species, precludes a direct solution of the linear system. To alleviate this difficulty, we solve the system by a Newton-Krylov method, so as to avoid forming and factoring the Jacobian matrix. In the last part, we present a model of flow in 3D for intersecting fractures, by using a domain decomposition method. The fractures are treated as interfaces between subdomains. We show existence and uniqueness of the solution, and we validate the model by numerical tests
Amir, Laila. "Modèles couplés en milieux poreux : transport réactif et fractures." Phd thesis, Université Paris Dauphine - Paris IX, 2008. http://tel.archives-ouvertes.fr/tel-00373688.
Full textCe travail est divisé en trois parties : la première partie contient une analyse de différents schémas numériques pour la discrétisation des problèmes d'advection-diffusion, notamment par une technique de séparation d'opérateurs, ainsi que leur mise en oeuvre informatique, dans un code industriel.
La deuxième partie, qui est la contribution majeure de cette thèse, est consacrée à la modélisation et à l'implémentation d'une méthode de couplage globale pour le transport réactif. Le système couplé transport-chimie est décrit, après discrétisation en temps, par un système d'équations non linéaires. La taille du système sous-jacent, à savoir le nombre de points de grille multiplié par le nombre d'espèces chimiques, interdit la résolution du système linéaire par une méthode directe. Pour remédier à cette difficulté, nous utilisons une méthode de Newton-Krylov qui évite de former et de factoriser la matrice Jacobienne.
Dans la dernière partie, nous présentons un modèle d'écoulement dans un milieu fracturé tridimensionnel, basé sur une méthode de décomposition de domaine, et qui traite l'intersection des fractures. Nous démontrons l'existence et l'unicité de la solution, et nous validons le modèle par des tests numériques.
Ouali, Chakib. "Caractérisation multi-échelle de l’écoulement de mousses en milieux poreux en contexte EOR." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS001.
Full textFoam has long been used as a mobility control agent in Enhanced Oil Recovery (EOR) processes to enhance sweep efficiency and overcome gravity segregation, viscous fingering and gas channeling, which are gas-related problems when the latter is injected alone in the reservoir. However, the systematic use of foam in reservoir engineering requires more in-depth knowledge of its dynamics in porous media. The literature shows two types of experimental approaches based either on petrophysical studies carried out on 3D porous systems and based on pressure measurements, or on microfluidic studies that allow direct visualization of foam flow but are limited to 1D or 2D model systems. The research investigated in this thesis aims to bridge the gap between these two approaches. The proposed strategy is to characterize in situ the foam flow in 3D porous media with techniques providing a wide range of temporal and spatial resolutions. A coreflood setup giving access to classical petro-physical measurements was developed and then coupled to different observation cells designed specifically for each characterization instrument. First, an X-ray CT scanner was used to describe and visualize the foam flow at the core scale. The rheological behavior of foam on this scale was studied as a function of the injection conditions such as gas velocity and foam quality. Secondly, Small Angle Neutron Scattering (SANS) was used to probe the foam structure in situ during the flow, on a wide length scale, up to three orders of magnitude in size. In situ foam texture (size and density of bubbles and lamellae) was measured for different foam qualities and at different propagation distances from the injection point. A comparison to the geometric characteristics of the porous medium was also realized. Thirdly, High Resolution Fast X-ray Micro-tomography on a Synchrotron was used to visualize the foam flow at the pore scale. This allowed to confirm visually some foam characteristics measured with SANS and to investigate on local intermittent gas trapping and mobilization. This study is an important step in the multi-scale characterization of foam flow in 3D porous media and provides some answers to certain generally accepted assumptions
Agnaou, Mehrez. "Une étude numérique des écoulements mono et diphasique inertiels en milieux poreux." Thesis, Paris, ENSAM, 2015. http://www.theses.fr/2015ENAM0050/document.
Full textThis work focuses on inertial flow in porous media encountered in differentindustrial situations such as flow around wells in oil recovery, flow in filters and in columns ofreactors for chemical engineering, etc. In stationary flow regime, the different macroscopicmodels describing inertial (non-linear) flow are still discussed. These models consist in theDarcy’s law with correction extra terms whose dependence upon the filtration velocity is afunction of the flow regime. In this work, a particular attention is attributed first to the numericalinvestigation (DNS), on model structures, of the limit of one phase Newtonian stationary flowwhich corresponds to the first Hopf bifurcation, characterized by a critical Reynolds number.The knowledge of this limit is crucial since it establishes the ranges of validity of the relevantmacroscopic stationary models. In a second step, the dependence of the deviation (inertial)from Darcy’s law on the properties of the porous structure (grains shape, disorder) and on theorientation of the flow is analyzed in 2D and 3D situations. The effective properties of thestructure and the flow at the macroscopic scale are obtained from the numerical resolution ofthe closure problems associated to the macroscopic model obtained from an up-scalingprocedure (volume averaging) of the Navier-Stokes equations. In order to identify the origin ofthe deviation and its different forms, the variation of the microscopic flow structure with theReynolds number is analyzed. More specifically, the role of the recirculation zones, and thecorrelations with flow streamlines curvature multiplied by the local kinetic energy and thevariation of the kinetic energy along these lines are studied. The last part of the work isdedicated to a numerical investigation of the deviation from the generalized Darcy’s law in thecase of two phase inertial flow
Id, Moulay Mohamed. "Simulation numérique 3D d'Écoulement Multiphasiques Réactifs en Milieux Poreux." Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3015.
Full textReactive transport modeling is used in many energy and environmental applications related to subsurface flows. Modeling such problems leads to a highly nonlinear system of PDEs coupled with algebraic or ODEs. Two types of approaches for the numerical solving of reactive transport problems are widely used in the literature. One is the operator-splitting approach which consists in splitting the flow and reactive transport problems. These latter are solved sequentially at each time step. The other strategy is based on the fully coupled approach in which the entire system is solved simultaneously. The goal of the PhD thesis is the development of a fully coupled fully implicit finite volume scheme for numerical modeling of single and two-phase multicomponent flows with reactive transport in porous media. New reactive transport modules will be implemented in DuMuX, a free and open-source simulator for flow and transport processes in porous media. Numerical simulations for 2D and 3D including benchmark tests and high performance computing will be performed to validate the modules
Verdière, Sophie. "Méthodes numériques de double maillage pour la simulation d'écoulements polyphasiques dans les milieux poreux." Pau, 1997. http://www.theses.fr/1997PAUU3004.
Full textMejni, Fatah. "Structures synchronisées dans les écoulements inhomogènes de convection mixte en milieux poreux." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10071/document.
Full textMixed convection flow in porous media heated from below non uniformly and subjected to an horizontal pressure gradient is studied theorettcally and numericalIy. The prescribed temperature at the bottom boundary is assumed to vary slowly in space. The result is the establishment of a weak inhomogeneous basic state, the stabIllty of which is carried out using the WKBJ approximation. Depending on the choice of the imposed inhomogeneous temperature profile, two cases prove to be of interest: the base flow displays an absolute instability region either detached from the inlet or attached to it. Results from combined direct numerical simulations and limear stability approach have revealed that in the first case, the nonlinear solution is a steep nonlinear global mode, with a sharp stationary front located at a margimally absolutely unstable station. ln the second configuration, the scaling laws for the establishment of a nonlmear global mode quenched by the inlet are found to perfectly agree with the theory. It is also found that in both configurations, the global frequency of synchronized oscillations corresponds to the local absolute frequency determined by Iinear criterion, even far from the threshold of global instability. All these results agree remarkably with recent advances of nonlinear global modes theory, A good agreement is also found between the predictions of the theory and the measured global frequencies
McKee, François. "Etude et mise à l'échelle des écoulements diphasiques en milieux poreux hétérogènes par une approche d'optimisation." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=bd435ce7-5514-401b-9305-92faceb0a7ba.
Full textGeological and geophysical expertise coupled to numerical simulation allow the petroleum industry to build increasingly detailed reservoir models. These models integrate the whole set of available data (production and seismic) but involve geostatistics and stochastic approach. A large number of simulations is required to estimate hydrocarbon reserves and optimize oil recovery. During a first step, engineers build a geological model respecting the real geometry of the reservoir and containing possibly million of cells. The second step consist in building a coarser model, the reservoir model. It contains less cells in order to ensure that numerical simulation is feasible within a reasonable time. Upscaling is the characterization of the reservoir model accordingly to the geological model properties. Multiphase flows upscaling is still an actual issue. Indeed, methods are applied from case to case or in successive stages. Relative permeability curves, characteristic of multiphase flow equations, are a real issue. The main purpose here is to propose an upscaling method for relative permeability by an optimization approach. The studied reservoir is divided in several zones. The upscaled relative permeability curves obtained for each zone allow the building of a reservoir model. This reservoir model forms a good match for the geological model in terms of equivalent flow
Jacquet, Claudine. "Caractérisation géométrique et propriétés de transport de milieux poreux consolidés." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1991. http://tel.archives-ouvertes.fr/tel-00844830.
Full textTunc, Xavier. "La modélisation des failles conductrices pour les écoulements en milieux poreux." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4809/document.
Full textIn this thesis, we are interested in the modelisation of fluid flow along conductive faults. This model, so-called double interface model tackles two majors difficulties encountered when modelising faults. First of all, the use of an interface model, in which the faults are represented by lower dimension elements allows to treat the problem of space scale. Then, the use of two interfaces to modelise each fault allows to handle quite naturally the non-matching grid problem arising from this kind of problem. The question of non-planar fault and fault networks is also addressed. This model is then validated on several academic test cases and a synthetic case inspire by CO2 storage is also performed. Finally, a theoric study is also conducted in order to validate our approach
Gassara, Omar. "Modélisation des écoulements de mousse dans les milieux poreux en récupération assistée du pétrole." Electronic Thesis or Diss., Paris 6, 2017. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2017PA066588.pdf.
Full textConventional techniques of oil recovery consist in injecting water and/or gas into the geological formation to force out the oil. These methods may reveal ineffective because of high permeability contrasts, unfavorable mobility ratio between the driving fluid and the oil in place which generally generates viscous fingering, and gravity segregation. In this context, foam has shown a great potential to overcome all these detrimental effects, and thereafter, to improve the volumetric sweep efficiency. Still some key points need to be addressed regarding the predictive calculation of multiphase foam flow in porous media. Methods for modeling foam flow in porous media fall into two categories: population balance (PB) models and (semi)-empirical (SE) models. On the one hand, PB models describe foam lamellas transport in porous media and predict the evolution of foam microstructure as the result of pore-scale mechanisms of lamellas generation and destruction. Within this framework, the modeling of foam effects on gas mobility is directly related to foam texture (lamellas density) along with the effects of other parameters impacting its rheology such as foam quality and velocity, permeability of the porous media, surfactant concentration, etc. On the other hand, SE models are based on the extension of multiphase classical Darcy's model to describe foam flow in porous media, such that the foam texture effects are described indirectly through a multi-parameter interpolation function of parameters measured/observed in laboratory. Such formulation has to be calibrated from foam flow experimental data on a case-by-case basis, which can turn to be a cumbersome task. Furthermore, SE models involve uncertainty because they are not based on mechanistic laws driving lamellas transport in porous media, and their predictive capacity remains low as too few laboratory data are generally available for their calibration. Nonetheless, the reservoir engineer needs a reliable foam model in order to design, assess and optimize foam enhanced oil recovery processes for field application. Accordingly, this thesis aims at providing further insights into the topics related to the parameterization of (semi)-empirical models through better formulated and calibrated laws in order to improve their predictivity. In this work, we have established the physical basis necessary to validate the (semi)-empirical models. Indeed, we developed the equivalence between SE and PB models achieved through relationships between the parameters of these two modeling approaches (industrial and physical). The equivalence has been established and studied using a pre-calibrated PB model of the literature to fit steady-state foam measurements. In addition, this equivalence allowed us to develop a new procedure to calibrate the (semi)-empirical models in a reliable and deterministic way. This procedure was tested and validated using results from IFPEN core-flood experiments by translating them into steady-state texture measurements. Finally, we proposed scaling laws for empirical model parameters with the permeability of the porous media, by analyzing the fitted parameters on cores of different permeabilities. Different interpretations of the scaling laws are herein provided using theoretical models for lamellas stability. Then, their importance has been demonstrated through simulations on a two layer reservoir cross-section. The simulation results indicate that the predictions of foam flow in a heterogeneous reservoir require a good knowledge of the scaling laws of SE model parameters with permeability
Sanchez, Mohamed Riad. "Application des techniques de bases réduites à la simulation des écoulements en milieux poreux." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC079.
Full textIn geosciences, applications involving model calibration require a simulator to be called several times with an optimization process. However, a single simulation can take several hours and a complete calibration loop can extend over serval days. The objective of this thesis is to reduce the overall simulation time using reduced basis (RB) techniques.More specifically, this work is devoted to applying such techniques to incompressible two-phase water-oil flows in porous media. Despite its relative simplicity in comparison to other models used in the petroleum industry, this model is already a challenge from the standpoint of reduced order modeling. This is due to the coupling between its equations, the highly heterogeneous physical data, as well as the choice of reference numerical schemes.We first present the two-phase flow model, along with the finite volume (FV) scheme used for the discretization and relevant parameterizations in reservoir simulation. Then, after having recalled the RB method, we perform a reduction of the pressure equation at a fixed time step by two different approaches. In the first approach, we interpret the FV discretization as a Ritz-Galerkine approximation, which takes us back to the standard RB framework but which is possible only under severe assumptions. The second approach frees us of these restrictions by building the RB method directly at the discrete level.Finally, we deploy two strategies for reducing the collection in time of pressuresparameterized by the variations of the saturation. The first one simply considers time as an additional parameter. The second one attempts to better capture temporalcausality by introducing parameterized time-trajectories
Le, maout Vincent. "Modélisation d'écoulements multiphasiques de fluides viscoélastiques en milieux poreux." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0161.
Full textViscoelastic multiphase flows in porous media are at the crossroad of many engineering sciences. Initiated with petroleum industry, their range of application is now extended to many additional areas, such as civil engineer-ing, geotechnics, composite impregnation and more recently life sciences. Mathematical formulations of these problems often rely on governing equations formulated directly at the macroscale, or are derived from micro-scopic considerations using upscaling technics. Generally, the second approach is prefered as it permits to estab-lish a clear connection between the scales of the porous media and to identify the restraining hypothesis neces-sary to the formulation of the equation system. However, when upscaling is performed, many unknown parameters remain to obtain a close set of equations, and additional closure relationships must be considered in order to find a solvable formulation. For the flows of interest, exhibiting multiphasic and viscoelastic properties, the usual macroscale empirical relations may be too inaccurate to capture relevantly the influence of underlying physics at play, and few experimental data allow characterising the missing parameters.A solution to this problem consists in performing numerical simulations at the microscale to extract missing information about media properties through microfluidic experiments in silico. To achieve this multi-scale modelling strategy, a pore scale model has been derived in this thesis for two applications of interest: improved oil recovery and tumor growth. The derivation of a unique model for these applications makes use of conservation equations at the microscale considered during upscaling operations. The obtained formulation allows a multiphase flow description by means of a phase-field method and the viscoelasticity of phases is introduced through the Oldroyd-B constitutive equation. The resulting mathematical model, implemented in a finite element code, permits to study in what extents the introduction of the polymer solution viscoelastic rheology during enhanced recovery process improves the mobilization of oil at pore scale. The influence of viscoelasticity on numerical solutions, as well as sweep efficiency of the medium, is compared to literature experimental results. On other hand, the mathematical model has been specialised to simulate the growth of a few hundred microns wide tumor aggregates. Since the precursor works of Steinberg the viscoelastic fluids analogy for cells aggregate is increasingly used for mathematical modelling. In this thesis, this similarity allows to study numerically the evolution of tumor aggregates in various environments. The biomechanical formulation of the problem permits to simulate cells population behaviour under mechanical load, which affects the growth rate according to the constraints in the system. In this context, the mathematical model is used to separate mechanical from biological effects, and provide original explanations on tumor growth in confined environment. The predictive capacity of the model on in vitro experiments shows the relevance of the viscoelastic multiphase flow for the tumor growth description
Hidani, Abdelkader. "Modélisation des écoulements diphasiques en milieux poreux à plusieurs types de rochesde roches." Saint-Etienne, 1993. http://www.theses.fr/1993STET4029.
Full textGassara, Omar. "Modélisation des écoulements de mousse dans les milieux poreux en récupération assistée du pétrole." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066588/document.
Full textConventional techniques of oil recovery consist in injecting water and/or gas into the geological formation to force out the oil. These methods may reveal ineffective because of high permeability contrasts, unfavorable mobility ratio between the driving fluid and the oil in place which generally generates viscous fingering, and gravity segregation. In this context, foam has shown a great potential to overcome all these detrimental effects, and thereafter, to improve the volumetric sweep efficiency. Still some key points need to be addressed regarding the predictive calculation of multiphase foam flow in porous media. Methods for modeling foam flow in porous media fall into two categories: population balance (PB) models and (semi)-empirical (SE) models. On the one hand, PB models describe foam lamellas transport in porous media and predict the evolution of foam microstructure as the result of pore-scale mechanisms of lamellas generation and destruction. Within this framework, the modeling of foam effects on gas mobility is directly related to foam texture (lamellas density) along with the effects of other parameters impacting its rheology such as foam quality and velocity, permeability of the porous media, surfactant concentration, etc. On the other hand, SE models are based on the extension of multiphase classical Darcy's model to describe foam flow in porous media, such that the foam texture effects are described indirectly through a multi-parameter interpolation function of parameters measured/observed in laboratory. Such formulation has to be calibrated from foam flow experimental data on a case-by-case basis, which can turn to be a cumbersome task. Furthermore, SE models involve uncertainty because they are not based on mechanistic laws driving lamellas transport in porous media, and their predictive capacity remains low as too few laboratory data are generally available for their calibration. Nonetheless, the reservoir engineer needs a reliable foam model in order to design, assess and optimize foam enhanced oil recovery processes for field application. Accordingly, this thesis aims at providing further insights into the topics related to the parameterization of (semi)-empirical models through better formulated and calibrated laws in order to improve their predictivity. In this work, we have established the physical basis necessary to validate the (semi)-empirical models. Indeed, we developed the equivalence between SE and PB models achieved through relationships between the parameters of these two modeling approaches (industrial and physical). The equivalence has been established and studied using a pre-calibrated PB model of the literature to fit steady-state foam measurements. In addition, this equivalence allowed us to develop a new procedure to calibrate the (semi)-empirical models in a reliable and deterministic way. This procedure was tested and validated using results from IFPEN core-flood experiments by translating them into steady-state texture measurements. Finally, we proposed scaling laws for empirical model parameters with the permeability of the porous media, by analyzing the fitted parameters on cores of different permeabilities. Different interpretations of the scaling laws are herein provided using theoretical models for lamellas stability. Then, their importance has been demonstrated through simulations on a two layer reservoir cross-section. The simulation results indicate that the predictions of foam flow in a heterogeneous reservoir require a good knowledge of the scaling laws of SE model parameters with permeability
Semin, Benoît. "Intercation d'une fibre et d'un écoulement en géométrie confinée." Palaiseau, Ecole polytechnique, 2010. http://pastel.archives-ouvertes.fr/docs/00/55/93/59/PDF/these_BSemin.pdf.
Full textThe motion of elongated objects in a fluid is encountered in many scientific fields, ranging from oil recovery and paper production to microorganism swimming. In the present thesis we study the behavior of a long cylindrical fiber in a confined flow (fracture, microfluidic channel). We first determine both experimentally and numerically the drag on this object as a function of its orientation and position in the aperture. A fiber parallel to the flow only slightly perturbs the flow, and the force on it can be estimated using 2D models. On the contrary, if it is perpendicular to the flow, the latter becomes 3D if blockage is partial. In this configuration, the lift is sufficient to keep the cylinder in the middle of the flow. For Reynolds numbers higher than 20, this position becomes unstable and the cylinder oscillates between the walls. The threshold of this instability is lower than that of Bénard-Von Kármán vortex shedding. The position of the cylinder satisfies a Van der Pol equation, which allows for a quantitative prediction of the Hopf bifurcation of the system. A hydrodynamic interpretation of the coefficients of this equation is given. We also develop and validate a new image processing method, which give the shape of the fiber with a sub-pixel precision. Moreover, the tangent vector angle and the curvature, of interest because it is related to the bending moment, are accurately measured
Vu, Minh Ngoc. "Modélisation des écoulements dans des milieux poreux fracturés par la méthode des équations aux intégrales singulières." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1168/document.
Full textThis thesis aims to develop a method for numerical modelling of fluid flow through fractured porous media and for determination of their effective permeability by taking advantage of recent results based on formulation of the problem by Singular Integral Equations. In parallel, it was also an occasion to continue on the theoretical development and to obtain new results in this area. The governing equations for flow in such materials are reviewed first and mass conservation at the fracture intersections is expressed explicitly. Using the theory of potential, the general potential solutions are proposed in the form of a singular integral equation that describes the steady-state flow in and around several fractures embedded in an infinite porous matrix under a far-field pressure condition [136, 139]. These solutions represent the pressure field in the whole body as functions of the infiltration in the fractures, which fully take into account the fracture interaction and intersections. Closed-form solutions for the fundamental problem of fluid flow around a single fracture are derived, which are considered as the benchmark problems to validate the numerical solutions. In particular, the solution obtained for the case of an elliptical disc-shaped crack obeying to the Poiseuille's law has been compared to that obtained for ellipsoidal inclusions with Darcy's law [140].The numerical programs have been developed based on the singular integral equations method to resolve the general potential equations [132, 180]. These allow modeling the fluid flow through a porous medium containing a great number of fractures. Besides, this formulation of the problem also allows obtaining a semi-analytical infiltration solution over a single fracture depending on the matrice permeability, the fracture conductivity and the fracture geometry. This result is the important key to upscalling the effective permeability of a fractured porous medium by using different homogeneisation schemes. The results obtained by the self-consistent scheme have been in particular established. The multi-region approach can be used to extend the general potential solution written for the infinite domain to that for a finite domain [181]. A closed-form solution for flow in and around a single partially saturated fracture, surrounded by an infinite matrix subjected to a far-field condition, is also derived combining the solutions for a superconductive fracture and for an imprevious fracture. This solution is then employed to estimate the effective permeability of unsaturated fractured porous media [141].The effective permeability model is applied to study the hydromechanical behaviour of a fault zone constituted by a clay core surrounded by fractured zones in the context of CO2 geological storage. The pressure injection induces an overpressure in the reservoir that may affect the permeability of the fractured zones leading to complexe coupled hydromechanical phenomena. The simulation results allow evaluating the risk of leakage of the reservoir brine to higher aquifers as well as the risk of fault reactivation
Loggia, Didier. "Etude par acoustique des écoulements de fluides miscibles en milieux poreux : instabilites-heterogeneites." Paris 7, 1996. http://www.theses.fr/1996PA077325.
Full textGuichard, Cindy. "Schémas volumes finis sur maillages généraux en milieux hétérogènes anisotropes pour les écoulements polyphasiques en milieux poreux." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00674503.
Full textLominé, Franck. "Écoulements de particules dans un milieu poreux." Rennes 1, 2007. https://tel.archives-ouvertes.fr/tel-00198209.
Full textThis work deals with experimental and numerical investigations on particles flow through a packing of larger spheres. We built an experimental device to study lateral dispersion and the mean transit time of a blob of particles through a porous medium. Particularly, we determined the dependence of the mean transit time on the number of particles, on particle size and on the height of the porous medium. We also characterized the dependence of the lateral dispersion coefficient on the number of particles moving in the porous structure. Then, we developed numerical simulation models based on « Event-Driven » and « molecular dynamic of soft spheres » methods. Those allowed us to supplement the experimental study by analyzing the influence of various additional parameters. The access inside the porous medium allowed a finer analysis of particles dispersion. Finally, we approached the possibility of using the spontaneous percolation phenomenon to produce a mixer. Thanks to the numerical tool, we carried out and characterized mixtures of particles of different sizes. We showed that this process proves to be a simple and effective method to obtain homogeneous mixtures of particles
Chandesris, Marion. "Modélisation des écoulements turbulents dans les milieux poreux et à l'interface avec un milieu libre." Paris 6, 2006. http://www.theses.fr/2006PA066456.
Full textVu, Minh Ngoc, and Minh Ngoc Vu. "Modélisation des écoulements dans des milieux poreux fracturés par la méthode des équations aux intégrales singulières." Phd thesis, Université Paris-Est, 2012. http://pastel.archives-ouvertes.fr/pastel-00777926.
Full textBlanchard, Vincent. "Étude de l'influence d'un couche de polymère adsorbé sur des écoulements diphasiques (gaz/eau) dans des milieux poreux modèles." Bordeaux 1, 2005. http://www.theses.fr/2005BOR13119.
Full textOukhlef, Aimad. "Détermination de la distribution de tailles de pores d’un milieu poreux." Paris, ENSAM, 2011. http://www.theses.fr/2011ENAM0047.
Full textIn this work, we present two new methods to characterize the topological properties of porous media and more precisely their pore size distribution. The first method is based on the rheological properties of yield-stress fluids (such as Bingham or Casson fluids) flowing through the porous sample. The pore size distribution can be obtained from the measurement of the total flow rate of fluid as a function of the imposed pressure gradient provided an assumption is made on the general shape of the pores. In this work, we consider the simple and well-know Carman-Kozeny model. This technique is successfully tested both analytically and numerically for classical pore size distributions such as unimodal and multimodal Gaussian distributions and is extended to more realistic viscoplastic fluids (Herschel-Bulkley model). The second method is based on the dynamical analysis of the oscillatory flow of a Newtonian or non-Newtonian fluid through the porous medium. It consists in using the hydrodynamic transfer function of the porous sample and more particularly in the characterization of its complex admittance because the penetration depth and thus the pore size is related to the pulsation frequency of the imposed pressure gradient. The same capillary bundle model (Carman-Kozeny) is used here. This technique is tested and validated on several distributions for Newtonian and power-law fluids. In order to solve this problem, we introduce the notion of " complex inconsistency ". Compared to the existing methods, the simplicity, non-toxicity and cheapness of these two new techniques make them potentially interesting
Benard, Johann. "Ecoulements diphasiques en milieux poreux : modélisation et simulation de cas d'imbibition, de drainage et d'ébullition." Université de Marne-la-Vallée, 2004. http://www.theses.fr/2004MARN0226.
Full textThe general framework of this study concerns the modeling and the numerical simulation of two-phase flows in porous media for civil or environmental engineering applications. We study on the one hand water-air isothermal two-phase flows, and on the other hand water and vapour water flows with phase shift. We focus on transport phenomena involved by imbibition, drainage and boiling cases. We first present a continuous macroscopic model that describes mass and energy transfers in porous media, which leads to a system of partial derivative equations. We account for the phase shifts, when they exist, with respect to the principles of classical irreversible thermodynamics, which gives local equations and inequations. The discretization of the resulting system of equations is carried out by the finite volume method, thus leading to a system of nonlinear algebraic equations. An approximate solution is obtained by the Newton method. The model is used for the simulation of various physical situations. We first study the case of the resaturation of the artificial porous medium around nuclear waste. We then apply the model to the case of the drainage of a porous column initially saturated with water. We show how a simplified model can be used for the identification of the capillary pressure and the permeability of the nonwetting phase. A comparison with experimental results obtained by magnetic resonance imaging is proposed. We then study two cases of the apparition of water vapor in an initially saturated porous medium for which experimental measurements are available. The first one concerns a vertical porous column heated at its bottom boundary. The second one is the case of a large scale experiment reproducing the heating phenomena occurring in the storage of nuclear waste. In both cases, the simulation results have correctly reproduced the displacement of the boundary between the two-phase and one-phase zones. A comparison of numerical results and original analytical ones, in the case of a simplified Stefan problem, has shown an excellent agreement