Literatura académica sobre el tema "Dynamique d’écoulement"
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Artículos de revistas sobre el tema "Dynamique d’écoulement"
Peruzzetto, Marc, Gilles Grandjean, Anne Mangeney, Clara Levy, Yannick Thiery, Benoit Vittecoq, François Bouchut, Fabrice R. Fontaine y Jean-Christophe Komorowski. "Simulation des écoulements gravitaires avec les modèles d’écoulement en couche mince : état de l’art et exemple d’application aux coulées de débris de la Rivière du Prêcheur (Martinique, Petites Antilles)". Revue Française de Géotechnique, n.º 176 (2023): 1. http://dx.doi.org/10.1051/geotech/2023020.
Texto completoYoucef, Ahmed. "Simulation numérique du comportement dynamique et thermique d’un écoulement d’air à travers un canal muni des chicanes sous forme aile (Application aux capteurs solaires plans à air)". Journal of Renewable Energies 20, n.º 3 (30 de septiembre de 2017): 521–29. http://dx.doi.org/10.54966/jreen.v20i3.646.
Texto completoTilston, Mike y Pascale M. Biron. "Structure de l’écoulement tridimensionnel, turbulence et contrainte de cisaillement dans une boucle de méandre". Géographie physique et Quaternaire 60, n.º 3 (13 de mayo de 2008): 225–39. http://dx.doi.org/10.7202/017997ar.
Texto completoWibowo, Sandy Budi, Franck Lavigne, Philippe Mourot, Jean-Philippe Métaxian, Marie Zeghdoudi, Clément Virmoux, Cosmas Bambang Sukatja, Danang Sri Hadmoko y Bachtiar Wahyu Mutaqin. "Analyse couplée d'images vidéo et de données sismiques pour l’étude de la dynamique d’écoulement des lahars sur le volcan Merapi, Indonésie". Géomorphologie : relief, processus, environnement 21, n.º 3 (7 de septiembre de 2015): 251–66. http://dx.doi.org/10.4000/geomorphologie.11090.
Texto completoRose, Catherine V., Adam C. Maloof, Blair Schoene, Ryan C. Ewing, Ulf Linnemann, Mandy Hofmann y John M. Cottle. "The End-Cryogenian Glaciation of South Australia". Geoscience Canada 40, n.º 4 (20 de diciembre de 2013): 256. http://dx.doi.org/10.12789/geocanj.2013.40.019.
Texto completoBatonon-Alavo, Dolores I., Denis Bastianelli, Christophe A. A. M. Chrysostome, Guillaume Duteurtre y Philippe Lescoat. "Sécurisation des flux d’approvisionnement en matières premières et de mise en marché des produits dans le secteur avicole : cas de la filière œufs au Bénin". Revue d’élevage et de médecine vétérinaire des pays tropicaux 68, n.º 1 (19 de noviembre de 2015): 3. http://dx.doi.org/10.19182/remvt.20571.
Texto completoLebbi, Mohamed, Toufik Chergui, Abdelhamid Boualit y Lyes Boutina. "Influence des paramètres géométriques sur le contrôle thermo-hydrodynamique d’une centrale à cheminée solaire". Journal of Renewable Energies 17, n.º 3 (19 de octubre de 2023). http://dx.doi.org/10.54966/jreen.v17i3.451.
Texto completoMesticou, Zyed y Mariem Kacem. "Effet de la vitesse d’écoulement sur la dynamique de transport des microparticules dans des lits de sable et de gravier". Déchets, sciences et techniques, N°79 (2019). http://dx.doi.org/10.4267/dechets-sciences-techniques.4030.
Texto completoMenni, Younes, Ahmed Azzi y Chafika Zidani. "Etude numérique comparative entre deux types de chicanes et ailettes (rectangulaire et rectangulaire arrondie) utilisées pour améliorer les performances des capteurs solaires plans à air". Journal of Renewable Energies 18, n.º 3 (18 de octubre de 2023). http://dx.doi.org/10.54966/jreen.v18i3.511.
Texto completoAoues, Kamel, Noureddine Moummi, Abdelhafid Moummi, Miloud Zellouf, Adnane Labed y Elhadj Achouri. "Etude de l’influence des rugosités artificielles sur les performances thermiques des capteurs solaires plans à air". Journal of Renewable Energies 11, n.º 2 (30 de junio de 2008). http://dx.doi.org/10.54966/jreen.v11i2.70.
Texto completoTesis sobre el tema "Dynamique d’écoulement"
Kourtzanidis, Konstantinos. "Modélisation numérique d’actionneurs plasma pour le contrôle d’écoulement". Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0040/document.
Texto completoAs aerodynamic flow control still remains one of the top subjects of research in the aerospace scientific world, new ways to perform such a control are being constantly studied. Plasma actuators based on momentum or energy addition in the flow, have been proven capable of positively modifying the flow aerodynamic features. Nevertheless, the development and optimization of such actuators, require further understanding of the basic multi-scale physics involved. In this thesis, we are interested in the numerical modeling of plasma flow control actuators. Three types of plasma actuators are considered: Microwave Plasma Discharges (MPD), the Dielectric Barrier Discharge (DBD) and the Plasma Synthetic Jet (PSJ). Concerning MPDs, a novel implicit approach has been developed which with have enabled three-dimensional simulations in time domain in reduced CPU time. The microwave breakdown and evolution of the plasma due to the electromagnetic waves has been studied numerically, demonstrating the three-dimensional nature of such discharges. Coupling of the EM-plasma model with an Euler based solver accounting for real gas effects, have revealed the plasma modification due to the intense gas heating. For the PSJ actuator, the numerical solver consists of three coupled numerical models and the obtained results of its operation offer important information of its performance and its limits. The DBD actuator has been numerically studied using 2 different solvers (based on the same physical model). Both solvers were capable to give quite accurate estimations of the induced force due to the plasma and various parametric studies have been conducted. These studies offer new perspectives in the understanding and the optimization of plasma actuators for flow control purposes
Joubert, Gilles. "Simulation numérique du contrôle de décrochage dynamique d'un profil en oscillation de tangage". Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2273/document.
Texto completoThe helicopter flight envelope is limited by dynamic stall, which can be reduced by flow control actuation. Numerous studies are dedicated to the alleviation of dynamic stall, however no actuator has ever been used on real rotor configuration. A new deployable Vortex Generator-type actuator called DVG has been designed by the ONERA and proved its efficiency over pitch-oscillating dynamic stall control of an OA209 airfoil. However, the control effect must be in-depth analyzed before further application. Therefore, the present works aims at reproducing the dynamic stall control through numerical simulations,in order to investigate the physics involved. After a first part dedicated to the literature review of dynamic stall control and Vortex Generators, a second part considered the validation and investigation of the static stall control. DVG-induced secondary flow has been characterized by its vortex interactions, which reduce the control efficiency because of the DVG thickness. This analysis made a preliminary modeling of the DVG possible. In a third part, validation and investigation of the dynamic stall control have been performed, and the actuation showed strong similarities with the static case. Eventually, Proper Orthogonal Decomposition of the flow brought evidence of Dynamic Stall Vortex mode distortion thanks to DVG presence. This work validates the numerical simulation methodology, lets hope possible improvement of the actuator design and allows further numerical simulations of dynamic stall control over real helicopter blades
Saker, Assia. "Étude critique de quelques techniques expérimentales d’évaluation de la coulabilité des poudres". Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0314.
Texto completoIn industrial sectors, such as chemical, pharmaceutical or food industries, poor flowability of powders is often the causes of process malfunction. Poor flowability can lead to the blocking of powders in a silo, dosing and filling problems, or even bad quality on final product. To ensure proper process operation, it is therefore necessary and essential to evaluate the flowability of powders used. For this purpose, several experimental techniques such as angle of repose devices, shear cells or powder packing devices can be used. Flowability indices can then be defined in order to classify the powders according to the flow quality. Experimental tests have been carried out on several types of powders and the first results have shown that the transition from one technique to another can modify or even reverse the classification of the powder flowability. Indeed, according to the techniques studied, powders are subjected to different mechanical stresses and therefore the choice of the technique must be adapted to the real case of study. In this work, we were particularly interested to the evaluation of powders flowability from compaction devices. The work carried out has shown that the dynamic parameters (amplitude and frequency of taps) greatly influence the classification of powders flowability. From an energy approach, it has been shown that the evaluation of the flowability from Hausner ratio can be given by a compaction technique only if it achieves a value of energy required to obtain a maximal compaction of the particles. Finally, an implementation study of flowability evaluation techniques was carried out in the field of formulation by focusing on the quantitative evaluation of the influence of a glidant
Saker, Assia. "Étude critique de quelques techniques expérimentales d’évaluation de la coulabilité des poudres". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0314.
Texto completoIn industrial sectors, such as chemical, pharmaceutical or food industries, poor flowability of powders is often the causes of process malfunction. Poor flowability can lead to the blocking of powders in a silo, dosing and filling problems, or even bad quality on final product. To ensure proper process operation, it is therefore necessary and essential to evaluate the flowability of powders used. For this purpose, several experimental techniques such as angle of repose devices, shear cells or powder packing devices can be used. Flowability indices can then be defined in order to classify the powders according to the flow quality. Experimental tests have been carried out on several types of powders and the first results have shown that the transition from one technique to another can modify or even reverse the classification of the powder flowability. Indeed, according to the techniques studied, powders are subjected to different mechanical stresses and therefore the choice of the technique must be adapted to the real case of study. In this work, we were particularly interested to the evaluation of powders flowability from compaction devices. The work carried out has shown that the dynamic parameters (amplitude and frequency of taps) greatly influence the classification of powders flowability. From an energy approach, it has been shown that the evaluation of the flowability from Hausner ratio can be given by a compaction technique only if it achieves a value of energy required to obtain a maximal compaction of the particles. Finally, an implementation study of flowability evaluation techniques was carried out in the field of formulation by focusing on the quantitative evaluation of the influence of a glidant
Szmigiel, Mathieu. "Etude du flux de soubassement sur la dynamique du sillage d'un corps non profilé à culot droit : Application du contrôle actif pour la réduction de traînée de véhicule industriel". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC016/document.
Texto completoThis PhD thesis was realized in the scope of a collaboration with Renault Trucks and the LMFA in view of an evaluation of the relevance of active flow control for the drag reduction industrial vehicle. The two main objectives of this experimental work are to analyze the impact of the underbody flow on the wake dynamics and to study a flow control strategy combining inclined flaps (located on the upper and lateral edges of the rear base) with pulsed jet actuators for reducing the aerodynamic drag of a square-back bluff body. The wake development for several underbody velocities ranging from 10% to more than 80% of the free-stream velocity is studied on a simplified truck model at scale 1 :43. Rear base pressure measurements lead to the identification of four flow classes associated with different wake structures highlighted by 2D-3C PIV measurements. The wake of the first flow class obtained for very low underbody velocities looks like that of the wake of a 3D backward facing step. For higher underbody velocities, the underbody flow is separated from the ground impaging either the rear base or the upper shear layer triggering Kelvin-Helmoltz instabilities for this last case. Finally, the fourth class is characterized by a wake comparable to that of the Ahmed body. The implementation of inclined flaps at the rear base increases the base pressure for all classes. This increase is mainly due to the vectoring effect of the flow. An active control system is integrated to a 1 :8 scale model geometrically identical to that of the 1 :43 scale model with flaps. Two upper flap angles are tested to have (i) a natural flow attached to the flap and (ii) a natural flow detached from the flap. In comparison to the case without active flow control, drag reductions are obtained only for a specific range of actuation frequencies only in case (ii). These gains are associated with the reattachment of the flow on the flap. Finally, the robustness of the pressure gains is successfully tested in crosswind conditions
Laurendeau, François. "Analyse expérimentale et modélisation numérique d’un actionneur plasma de type jet synthétique". Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0023/document.
Texto completoNowadays, many studies are conducted in order to decrease greenhouse gases and noiseemissions from aircrafts. Active aerodynamic flow control is a way considered to meet thesechallenges. Among developed technologies of control, plasma actuators offer several advantages,including compactness, easy implementation and fast response. This thesis is devotedto the study of a plasma synthetic jet actuator which comes in the form of a small cavityinserted in wall and connected to the environment through a nozzle. An electrical arc isgenerated in the cavity, resulting in an increase of the cavity air pressure. Consequently,a jet is produced at the nozzle exhaust that can interact with the external flow. After thisejection phase, an aspiration phase naturally occurs, allowing the process to be repeatedat a frequency that can reach several kilohertz. This thesis aims at building a numericalmodel able to reproduce these physical phenomena. To do so, a Large Eddy Simulationis performed. The action of the plasma arc is taken into account through source terms inthe energy equation. In particular, these source terms are calculated using the assumptionof local thermodynamic equilibrium in the plasma. In addition, the heating of the actuatormaterials is simulated when it is operated at high frequency. The results from the numericalmodel are compared with velocity measurements, carried out when the actuator works ina quiescent environment and when it interacts with a boundary layer
Orgogozo, Laurent. "Transport de soluté biologiquement actif en milieu poreux incluant une phase biofilm : de la modélisation numérique aux perspectives expérimentales". Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL091N/document.
Texto completoModeling transport in porous media of organic chemical solute in presence of a bacterial population growing as biofilms is an important area of research for environmental applications, for example for remediation of groundwater contaminated by organic pollutants (biosparging, bio-barriers …). Biofilms, which are composed of bacteria and extracellular organic substances, grow on the pore walls of the porous medium. Bacteria degrade the organic solute by their metabolism and thus may contribute to pollution decrease. Bio-reactive transport of an organic solute in a porous medium including a biofilm phase is a strongly multi-scale (from the bacteria scale to the heterogeneity scale of the aquifer) and coupled (involving hydrodynamic, physicochemical and biochemical phenomena) process. The organic solute is transported by convection and diffusion in the fluid phase and diffuses into the biofilm phase, where it is degraded by bacterial metabolism. The goal of this work is to develop macroscopic models of bio-reactive transport at the Darcy-scale through volume averaging based on the data available at pore-scale. In the general case, the macroscopic system obtained by averaging pore-scale equations is a two coupled equations system (one equation for each phase), called two-equation model. By considering the relation between averaged concentration in the fluid phase and averaged concentration in the biofilm phase, several regimes of transport can be found which allow simplifying this system into a one equation system. The local mass equilibrium assumption leads to such a simplified model. When an equilibrium relationship between phases cannot be considered, a one equation model may though be developed if the biodegration rate is limited by external mass transfer or by the kinetics of bacterial metabolism. The use of these models implies the numerical solving of closure problems, in order to set up the values of the macroscopic transport parameters (dispersion tensor, interfacial flux …). Computations of these effective coefficients have been performed in different situations of mass transport in porous medium in order to study their behaviour. The results of these models have then been compared with direct simulations performed on a simplified geometry representative of a two-dimensional porous medium including a biofilm phase. Based on these comparisons, the validity domain of this model has been identified in terms of hydrodynamic and biochemical conditions of transport (i.e. the Péclet number and the Damköhler number). The set up of an experimental model of transport in a porous media including a biofilm phase has also been started, in order to make experimental validations of the previously developed numerical models and to build up an additional tool to study the considered phenomena
Szulga, Natacha. "Étude expérimentale et numérique du contrôle de transition de couche limite par actionneurs à plasma froid surfacique". Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0032/document.
Texto completoThe boundary layer transition from a laminar to a turbulent state increases thewall friction drag. Particularly on future aircrafts, one way of reducing fuel consumption,and answering both an environmental and economic issue, consists in delaying the transitionfarther downstream. In this context, the aim of this work is to characterize the impactof Dielectric Barrier discharge (DBD) plasma actuators on the boundary layer transition.When powered with an alternative high voltage, these active actuators produce apulsed body force which is tangential to the wall and, under some conditions, enablesto modify the boundary layer mean velocity profiles to delay the transition. Under otherconditions, the unsteady body force amplifies modal instabilities (Tollmien-Schlichtingwaves) may destabilize the boundary layers, leading to a promoted transition. A first experimentenabled to highlight this competition between the stabilizing mean effect andthe destabilizing unsteady effect by measuring respectively a transition delay and a transitionpromotion. A numerical study based on local stability analyses wass conducted inparallel and showed that a wide frequency range of TS waves is damped by the mean bodyforce, which explains the transition delay. A second experiment, focusing on the mean effect,enabled to show the influence of the actuator position and the cumulative effect ofseveral actuators on the transition delay
Hardy, Pierrick. "Etude et qualification aérothermodynamique et électrique d'un actionneur plasma de type jet". Thesis, Toulouse, ISAE, 2012. http://www.theses.fr/2012ESAE0014/document.
Texto completoImprovement of aerodynamics and environmental performances is a major issue for terrestrial and aeronautical industry.For fulfilling increasing demand, one of the answers is flow control. To achieve flow control, high performance actuators are needed. An innovative technique called Plasma Synthetic Jet actuator consists on applying an electrical discharge in asmall cavity. Plasma is created and increases gas temperature and pressure which results on the creation of a micro-jet through cavity opening.The PhD objectives are to develop the PSJ actuator, to describe actuator mechanisms and to apply it for controlling noise of a high subsonic jet. The first part of the study consists on defining flow control needs and on developing a PSJ actuator prototype. Then,actuator performances are characterised using electrical measurements of the discharge and using aerodynamic measurements. These measurements show that an electrical model of the discharge is needed. Based on the Braginskii model, a simple model is carried out and is applied to the actuator. Efficiency of the PSJ is deduced.The modified Braginskii model is then coupled with an URANS model to achieve frequency modelling of the actuator. Results match aerodynamics measurements .PSJ actuators are applied for controlling jet noise in a second part of the study. Schlieren visualisations are used to show micro-jet interaction with the main jet. Acoustic measurements are then performed and show that the PSJ is a goodactuator to control high subsonic jet noise
Ott, Célestin. "Caractérisation dynamique d'actionneurs fluidiques, et identification expérimentale des mécanismes dynamiques d'interaction jet - couche limite induits". Thesis, Valenciennes, Université Polytechnique Hauts-de-France, 2020. http://www.theses.fr/2020UPHF0001.
Texto completoActive flow control research field has high application potential, particularly in the transportation industry, where improving performance while reducing energy consumption represents major economic and environmental challenges. In this context, one of the objectives is to optimize control solutions to ensure a favorable global energy balance. In this thesis, we propose to tackle the question of the actuator choice (conventionally done by trial-and-error) by sharpening the understanding of the dynamic interaction between the actuator and the external flow. To do this, we analyzed the dynamic interaction between a turbulent boundary layer and four types of actuators commonly used in flow control : continuous, pulsed, synthetic and sweeping jet actuators. Thus, a three-dimensional reconstruction methodology based on local time-resolved velocity measurements is developed, which enabled to restore the flow dynamics. This methodology is based on two approaches : one, involving conditional processing, and the other, involving neural networks. These methods enabled the characterization of the intrinsic dynamic of the flow induced by the actuators, as well as the dynamic of their interactions with a turbulent boundary layer. Thanks to these characterizations, the physical phenomena involved were highlighted, as well as the control mechanisms associated with them. These results can be used in future flow control studies to optimize the choice of fluid actuators, based on the configuration and the control objective
Capítulos de libros sobre el tema "Dynamique d’écoulement"
MAISONNEUVE, Jean-Jacques. "Tenue à la mer des navires". En Interactions fluide-structure, 265–303. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9078.ch9.
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