Tesis sobre el tema "Code de simulation électromagnétique"
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Weber, Bruno. "Optimisation de code Galerkin discontinu sur ordinateur hybride : application à la simulation numérique en électromagnétisme". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD046/document.
Texto completoIn this thesis, we present the evolutions made to the Discontinuous Galerkin solver Teta-CLAC – resulting from the IRMA-AxesSim collaboration – during the HOROCH project (2015-2018). This solver allows to solve the Maxwell equations in 3D and in parallel on a large amount of OpenCL accelerators. The goal of the HOROCH project was to perform large-scale simulations on a complete digital human body model. This model is composed of 24 million hexahedral cells in order to perform calculations in the frequency band of connected objects going from 1 to 3 GHz (Bluetooth). The applications are numerous: telephony and accessories, sport (connected shirts), medicine (probes: capsules, patches), etc. The changes thus made include, among others: optimization of OpenCL kernels for CPUs in order to make the best use of hybrid architectures; StarPU runtime experimentation; the design of an integration scheme using local time steps; and many optimizations allowing the solver to process simulations of several millions of cells
Briault, Franck. "Contribution à la prédiction des perturbations électromagnétiques engendrées par un véhicule électrique". Paris 11, 1998. http://www.theses.fr/1998PA112461.
Texto completoTaking into account EMC aspects during the development of automotive projects needs to make use of numerical prediction tools. This present work, which has been realised in the PSA Peugeot Citroën company, gives a contribution to this long term goal, applied to the emissivity of the electric vehicle. Due to the high degree of complexity of this type of vehicle, we have to elaborate an hypothesis to simplify the representation, based on the high supposed shielding effectiveness of the electronic enclosure used. A numerical comparison has been obtained, between the radiation of a shielded electronic enclosure, and a typical structure with cables. Yet, it is necessary to obtain a numerical model of the shielded enclosure. To validate such a model, comparisons between computation and measurements are required. The plane wave experimental simulator existing at PSA permits to caracterise quickly the shielding effectiveness of the enclosure, by way of reception tests. Likewise, this property is used to validate the numerical modelisation, simulating the illumination of the enclosure. Meanwhile, this validation study has permitted to reveal the limitations of the numerical tool ASERIS BE©. It could then be developped in the AEROSPATIALE company, and adapted to the constraints of an automotive use. We could show threw this study the poor quality of the serial shielding used on board, in particular situation (low frequency magnetic field), which causes reciprocally high radiation levels outside. This has been illustrated in evaluating numerically the magnetic field radiated in a real vehicle. Then, threw the numerical prediction, we were able to give precious indications, concerning the interference hazards, and the location of sensitive receptors
Guillotin, Nicolas. "Normal conducting radio frequency cavity with strongly damped higher order modes for the ESRF". Paris 11, 2009. http://www.theses.fr/2009PA112026.
Texto completoAt the ESRF, longitudinal coupled bunch instabilities (LCBI) driven by higher order modes (HOM) are avoided up to the nominal beam current of 200 mA by precisely controlling the radio frequency cavity temperatures. A maximum of 300 mA was recently stored in the storage ring with a new longitudinal bunch-by-bunch feedback. The aim of this thesis was to design a strongly damped 352 MHz single-cell normal conducting cavity to eventually reach at term a 500 mA stored current without feedback system. The study was based on a cavity developed at BESSY for 500 MHz with three identical homogeneous double ridge waveguides (DRWG) loaded by ferrite blocks to damp the HOM. A first aluminium low power prototype scaled from this cavity was optimized at the ESRF by means of electromagnetic simulations. The longitudinal and transverse HOM impedances measured in the prototype matched generally well the computed values except for some modes. This first iteration yielded just enough HOM damping to suppress all LCBI up to 500 mA of stored beam with eighteen such cavities in the ring. However, the required 1. 4 m long HOM dampers would not fit in the existing tunnel. The dampers were then completely reworked by simulations leading to an innovative solution, including a short quadruple ridge waveguide and two DRWG with reduced size, which should significantly lower the HOM impedances. As an alternative to HOM damping, temperature tuning of HOM applied to a scaling of the 500 MHz ELETTRA single-cell cavity was also investigated numerically
Lebrère, Alexandre. "Construction d'un code de simulation numérique utilisant la méthode de Monte-Carlo pour le transfert radiatif d'une couche de plasma magnétisé turbulent". Orléans, 2004. http://www.theses.fr/2004ORLE2007.
Texto completoMöller, Nathalie. "Adaptation de codes industriels de simulation en Calcul Haute Performance aux architectures modernes de supercalculateurs". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV088.
Texto completoFor many years, the stability of the architecture paradigm has facilitated the performance portability of large HPC codes from one generation of supercomputers to another.The announced breakdown of the Moore's Law, which rules the progress of microprocessor engraving, ends this model and requires new efforts on the software's side.Code modernization, based on an algorithmic which is well adapted to the future systems, is mandatory.This modernization is based on well-known principles as the computation concurrency, or degree of parallelism, and the data locality.However, the implementation of these principles in large industrial applications, which often are the result of years of development efforts, turns out to be way more difficult than expected.This thesis contributions are twofold :On the one hand, we explore a methodology of software modernization based on the concept of proto-applications and compare it with the direct approach, while optimizing two simulation codes developed in a similar context.On the other hand, we focus on the identification of the main challenges for the architecture, the programming models and the applications.The two chosen application fields are the Computational Fluid Dynamics and Computational Electro Magnetics
Taillard, Julien. "Une approche orientée modèle pour la parallélisation d'un code de calcul éléments finis". Electronic Thesis or Diss., Lille 1, 2009. http://www.theses.fr/2009LIL10013.
Texto completoThe multicore processors generalization has led to the fact that most of the available computers are parallel, and utilization of this parallelism is important to obtain performance. This thesis deals with the development of parallel applications in order to benefit the available parallelism. In this thesis, we propose a methodology to develop parallel application based on the Model Driven Engineering (MDE). Applications specification is realized using the Unified Modeling Language (UML). After defining this methodology, an extension of the UML profile based on the Array-OL language is proposed to extend the application domain to scientific computing applications. The following part is the definition of a metamodel of procedural languages. This metamodel, independent of the targeted languages, allows to use the same model transformations for different targets. The use of a parallel library (such as OpenMP or MPI) makes possible the production of parallel code. Then, the transformation chain based on the model transformation concept is developped and introduced in the Gaspard framework. Shared memory machines are the target of this compilation using the OpenMP language. Finally, this methodology is used in the development of an electromagnetism simulation. Starting from models, generic design patterns of classical computations are extracted. Results given on the modeled applications are satisfying
Taillard, Julien. "Une approche orientée modèle pour la parallélisation d'un code de calcul éléments finis". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10013/document.
Texto completoThe multicore processors generalization has led to the fact that most of the available computers are parallel, and utilization of this parallelism is important to obtain performance. This thesis deals with the development of parallel applications in order to benefit the available parallelism. In this thesis, we propose a methodology to develop parallel application based on the Model Driven Engineering (MDE). Applications specification is realized using the Unified Modeling Language (UML). After defining this methodology, an extension of the UML profile based on the Array-OL language is proposed to extend the application domain to scientific computing applications. The following part is the definition of a metamodel of procedural languages. This metamodel, independent of the targeted languages, allows to use the same model transformations for different targets. The use of a parallel library (such as OpenMP or MPI) makes possible the production of parallel code. Then, the transformation chain based on the model transformation concept is developped and introduced in the Gaspard framework. Shared memory machines are the target of this compilation using the OpenMP language. Finally, this methodology is used in the development of an electromagnetism simulation. Starting from models, generic design patterns of classical computations are extracted. Results given on the modeled applications are satisfying
Leduc, Alexandre. "Etude par la simulation et l'expérimentation de la production d'ions métalliques Calcium à l'aide d'une source d'ions du type Résonance Cyclotronique Electronique". Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC239.
Texto completoIn the framwork of the SPIRAL2 project, the Electron Cyclotron Resonance Ion Source PHOENIX V3 (upgrade of the previous source PHOENIX V2) has been developed to improve the production of highly charged ions with A/Q=3. The ion source mainly aims at the production of metal ion beams. For this, condensable atoms are sublimated into oven before being injected into the ion source. During the production of such ion beams, the major part of atoms travel towards the plasma chamber wall and remains there. Those losses lead to low global ionization efficiency (of the order of ten percent).An hybrid code PIC (Particle In Cells) was developed to study the dynamic of charged particles and to reproduce the experimental A/Q spectrum produced by the PHOENIX V3 ion source. The simulation focuses on the propagation of ions in 3D. Using several adjustable parameters, the simulation outcomes fit the charge state distribution at the exit of the ion source. This code has provided encouraging results.In parallel with the simulation study of particle dynamic in the plasma, a series of simulations have been run to reproduce the operation of an oven leading to the emission of metallic atoms. The outcomes of the simulations allow analysis of the angular distribution of the particles leaving the hot crucible. The angular distributions provided by the simulations are compared with those obtained through experimental measurements.An experimental study was also initiated to reduce the sticking time of the metal atoms on the plasma chamber. For this, a thermoregulated cylinder has been designed and realised to promote the re-evaporation of fixed paricles. It is thus possible to increase the global ionization efficiency by a factor 2 at least and to study the variation of the efficiency as a fonction of the cylinder temperature
Giraudon, Cyril. "Contribution à la simulation électromagnétique dans le domaine temporel : Approches électromagnétique et informatique". Limoges, 2002. http://www.theses.fr/2002LIMO0019.
Texto completoVogt, Gilles. "Etude des phénomènes électromagnétiques dans les zones frontales des grandes machines synchrones : outils de tests sur le 125 MW". Thesis, Artois, 2013. http://www.theses.fr/2013ARTO0210/document.
Texto completoThis work aims to improve the knowledge of electromagnetic phenomena that occurin the end region of large turbo-generators. The goal of this work is to evaluate theaxial magnetic flux density with regard to the operating conditions (such as active orreactive power) in order to prevent potential deterioration of the stator. Indeed, the axialmagnetic field is known to induce hot points or voltages between laminations that maycause insulation breakdown and thus stator faults.An experimental apparatus in real scale has been designed and built. Its purpose is tostudy precisely the following phenomena: losses, axial magnetic flux density penetration,voltage across adjacent voltages.Finite element simulations (FEM) are also used: their advantages and drawbacks arediscussed, and the results are compared with the experimental measures. The wholeend-region of a turbo-generator is also simulated.Finally, a simple model of the axial magnetic flux is proposed. Its parameters are basedon the results of the FEM model, but it may be used in real time to evaluate the axialmagnetic flux density of any operating point
Imbs, Julien. "Modélisation numérique de débitmètre électromagnétique". Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE047.
Texto completoThis work concerns numerical modelling and study of electromagnetics flowmeters developed by Siemens. These devices are able to measure the flowrate of a conductive fluid in motion subject to a magnetic field. An induced potential is created and measured by two electrodes. The main purpose of this thesis is to modelize an electromagnetic flowmeter in order to get a realistic and reliable model to optimize the sensor in the futur. The first part of the work is to introduce the development theory of elec-tromagnetic flowmeter since the discovery of the induction law of Farady until today. The chapter II describes the industrial electromagnetics flowmeters manufactured by Siemens and provides the necessary knowledges for a better understanding of this work. In the chapter III, the electromagnetic flowmeter equation is derived and solved for the case of a homogenous magnetic field and point electrodes. This equation allows to get a relation between the induced potential, the velocity of the fluid and the magnetic field. We will discuss about the assumptions choose for this theory and used for the numerical model. In a first time the chapter IV focus on the theory of the magnetism and magnetics materials. In a second time, we present the magnetic characterization of the materials used in the electromagnetics flowmeters. In the chapter V, an introduction to the numerical modelling is done in order to justify the using of the finite element method for the magnetic simulation on the software NX Nastran. The second part of this chapter concerns the development and the numerical simulation of an electromagnetic flowmeter. At last, the third part is about the installation of a test bed to measure the magnetic field produced inside the electromagnetic flowmeter and to compare the results with the simulation. Numerical simulation of the magnetic field being checked by the measurements, the next chapter introduces molecular dynamics of the charged particles inside the measuring pipe in order to compute electrical potential. Finally, the last part introduces the calibration of electromagnetics flowmeters where a theoretical model was developed in order to compare them with experimentals values measured in production on Haguenau Siemens site
Romier, Maxime. "Simulation électromagnétique des antennes actives en régime non-linéaire". Phd thesis, Toulouse, INPT, 2008. http://oatao.univ-toulouse.fr/7824/1/romier.pdf.
Texto completoArmeanu, Ana Maria. "Simulation électromagnétique utilisant une méthode modale de décomposition en ondelettes". Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00690418.
Texto completoArmeanu, Ana. "Simulation électromagnétique utilisant une méthode modale de décomposition en ondelettes". Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721767.
Texto completoCagniot, Emmanuel. "Algorithmes data-parallèles irréguliers appliqués à la simulation électromagnétique tridimentionnelle". Lille 1, 2000. http://www.theses.fr/2000LIL10180.
Texto completoReyne, Gilbert. "Analyse théorique et expérimentale des phénomènes vibratoires d'origine électromagnétique". Grenoble INPG, 1987. http://www.theses.fr/1987INPG0154.
Texto completoDardenne, Julien. "Maillage 3D de structures anatomiques pour la simulation électromagnétique et thermique". Phd thesis, INSA de Lyon, 2009. http://tel.archives-ouvertes.fr/tel-00464815.
Texto completoLoewenhardt, Peter Karl. "A Vlasov plasma simulation code". Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27586.
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Physics and Astronomy, Department of
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Lurton, Thibaut. "Modélisation et simulation de l'interaction entre onde électromagnétique et surfaces de mer". Télécom Bretagne, 2010. http://www.theses.fr/2010TELB0118.
Texto completoThe aim of this thesis consists in numerically modelling the interaction between an electromagnetic wave emitted by an airborne observation radar and a maritime scene, i. E. An expanse of sea water of determined physical characteristics, possibly bearing one or several objects of metallic constitution on its surface, with a given temporal evolution. To this end, the study we carried out draws on different numerical modelling techniques for electromagnetic wave propagation: to begin with, the Finite-Differences Time-Domain (FDTD) technique was investigated, then the Transmission-Line Matrix method, inherited from the microwave domain, was studied. Each of the two methods is applied to the behaviour of the electromagnetic wave locally, in the vicinity of the sea surface only, the free space propagation simulation being undertaken through geometrical means. We propose a brief critical survey of the appropriateness of numerical methods and of their feasibility, particularly in terms of computation resources. After this theoretical study, we follow the development and implementation of the solution retained. We subsequently present several applications of our simulation method: radar cross section evaluation for small sea patches, derivation of reflectivity maps, extension of the radar cross section estimation to a large sea zone, yielding of the sea surface roughness influence upon the backscattered power, simulation of the synthetic aperture radar observation of a manufactured object in a sea scene, and comparison of the observation of static and moving sea scenes. The area of application of the work presented here is wide. The frame for the thesis is the MODENA development project, led at the Breton regional level, and whose objective is the development of radar acquisition simulation tools above the ocean's surface. In that respect, the theoretical and practical advances detailed in this thesis report widen the scope of the
Litman, Amelie. "Techniques d'inversion pour la diagraphie différée et l'imagerie électromagnétique". Habilitation à diriger des recherches, Université de Provence - Aix-Marseille I, 2009. http://tel.archives-ouvertes.fr/tel-00453676.
Texto completoDa, Silva Georges. "Contribution à l'étude de l'intégration et du découplage d'antennes associées à une paroi en matériau composite". Thesis, Rennes, INSA, 2014. http://www.theses.fr/2014ISAR0017.
Texto completoCommunication systems on board modern military ships or land vehicles can be numerous. This results in particularly developed radiating systems. The compacity of these systems and radio compatibility are major challenges. Under the Samcom project, the project partners are working to exploit the advantage of composite structural walls in terms of integration of antennas wall and electromagnetic decoupling between radiating elements. This thesis focuses on two parts. The first part consists in the study of integration of antennas on wall made up of composite materials. This is essentially to ensure that the operating characteristics of the antenna associated with the supporting structure can be maintained when it is fixed to a composite wall. The second part of this thesis is related to antenna decoupling mounted on the same ground plane. The aim is to find techniques to reduce antenna coupling and thus the separation between them. Integration solutions examined in the thesis concern the implementation of ferrite materials, absorbent and high impedance surfaces. In the first case, we attempted to optimize the location of ferrites so as to minimize their volume, thus saving cost and weight. Artificial higher impedance surface (HIS) have been examined and a design procedure adapted to the wall of the composite of the SHI surface has been developed. We then discuss on the solutions of antenna decoupling on a composite wall. The first decoupling solution investigated concerns the use of electromagnetic absorbers. We show that this is a very suitable solution if we have an absorbent whose impedance contrasts with that of the incidence wave is weak on full band frequency under penalty of sides effects. The second option concerns the surfaces electromagnetic bandgap. To ensure adequate decoupling performance, BIE surface must be adjusted in height. An important part of this work is dedicated to the assessment of some innovative decoupling solutions based on the use of a single cylindrical conducting rod. Indeed, we show on the one hand a single rod can lead to significant decoupling in a narrow band while on the other hand, a set of cylindrical rods contribute to ensure a rather broadband decoupling
Lalescu, Cristian. "Test particle transport in turbulent magnetohydrodynamic structures". Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209908.
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Doctorat en Sciences
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Le, Coat Gwenaëlle. "Discrétion électromagnétique des machines électriques tournantes". Grenoble INPG, 1997. http://www.theses.fr/1997INPG0108.
Texto completoEvery electrical machine produces electromagnetic stray fields. Those fields have low values in term of classical electrotechnics, but in other applications they seem high, like for example in magnetic detection. In this way the aim of this thesis is the reduction of electromagnetic stray fields of electrical machines. An experimental set has been installed. It allows to study, with a great accuracy, the electromagnetic signature of machines and tbe influence of sorne elements as the presence of end shields, and the rotor. The effect of eccentricity has been shown in a purpose of machine safety and maintenance. Numerical models have been developed. The 2D model gives only qualitative results because of its hypothesis : end windings not taken Înto account and infinite length of the machine. The 3D model is able to represent physical phenomena outside the machine. A simple analytical model is also described in this thesis. It is based on the representation by equivalent magnetic dipoles. It helps to understand the signature of the machines. Finally, thanks to those models, solutions for stray fields reduction, as an active shielding, have been considered, after a review of the present usual solutions
Aronsson, Peter. "Automatic Parallelization of Simulation Code from Equation Based Simulation Languages". Licentiate thesis, Linköping University, Linköping University, PELAB - Programming Environment Laboratory, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5720.
Texto completoModern state-of-the-art equation based object oriented modeling languages such as Modelica have enabled easy modeling of large and complex physical systems. When such complex models are to be simulated, simulation tools typically perform a number of optimizations on the underlying set of equations in the modeled system, with the goal of gaining better simulation performance by decreasing the equation system size and complexity. The tools then typically generate efficient code to obtain fast execution of the simulations. However, with increasing complexity of modeled systems the number of equations and variables are increasing. Therefore, to be able to simulate these large complex systems in an efficient way parallel computing can be exploited.
This thesis presents the work of building an automatic parallelization tool that produces an efficient parallel version of the simulation code by building a data dependency graph (task graph) from the simulation code and applying efficient scheduling and clustering algorithms on the task graph. Various scheduling and clustering algorithms, adapted for the requirements from this type of simulation code, have been implemented and evaluated. The scheduling and clustering algorithms presented and evaluated can also be used for functional dataflow languages in general, since the algorithms work on a task graph with dataflow edges between nodes.
Results are given in form of speedup measurements and task graph statistics produced by the tool. The conclusion drawn is that some of the algorithms investigated and adapted in this work give reasonable measured speedup results for some specific Modelica models, e.g. a model of a thermofluid pipe gave a speedup of about 2.5 on 8 processors in a PC-cluster. However, future work lies in finding a good algorithm that works well in general.
Report code: LiU-Tek-Lic-2002:06.
Seltner, Philippe. "Modélisation et simulation temporelle du système ligne-parasurtensions". Ecully, Ecole centrale de Lyon, 1992. http://www.theses.fr/1992ECDL0006.
Texto completoAbdulnour, Jawad. "Simulation numérique du champ électromagnétique d'une cavité résonnante au voisinage d'un tube d'insertion". Thèse, Université du Québec à Trois-Rivières, 1988. http://depot-e.uqtr.ca/5721/1/000574436.pdf.
Texto completoHoëppe, Frédéric. "Analyse du comportement électromagnétique des chambres réverbérantes à brassage de modes par l'utilisation de simulations numériques". Lille 1, 2001. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2001/50376-2001-177-178.pdf.
Texto completoReboud, Christophe. "Développement d'un modèle électromagnétique 3D pour la simulation d'un procédé de contrôle non destructif". Paris 11, 2006. http://www.theses.fr/2006PA112111.
Texto completoEddy current testing (ECT) is widely used in industrial fields such as iron and steel industry. Dedicated simulation tools provide a great assistance for the optimisation of ECT processes. CEA and the Vallourec Research Center have collaborated in order to develop a simulation tool of ECT of tubes. The volume integral method has been chosen for the resolution of Maxwell equation in a stratified medium, in order to get accurate results with a computation time short enough to carry out optimisation or inversion procedures. A fast model has been developed for the simulation of ECT of non magnetic tubes using specific external probes. New flaw geometries have been modelled: holes and notches with flat bottom. Validations of the developments, which have been integrated to the CIVA platform, have been carried out using experimental data recorded in laboratory conditions and in industrial conditions, successively. The integral equations derived are solved using the Galerkin variant of the method of moments with pulse functions as projection functions. In order to overcome some memory limitations, other projection functions have been considered. A new discretisation scheme based on non-uniform B-splines of degree 1 or 2 has been implemented, which constitutes an original contribution to the existing literature. The decrease of the mesh size needed to get a given accuracy on the result may lead to the simulation of more complex ECT configurations
Delort, Thierry. "Résolution théorique et numérique de problèmes de diffraction électromagnétique en aéronautique". Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30078.
Texto completoBouillon, François. "Simulations numériques directes du contrôle électromagnétique : étude de l'impact d'un forçage électromagnétique sur un écoulement turbulent en canal plan". Phd thesis, Université Joseph Fourier (Grenoble), 2004. http://tel.archives-ouvertes.fr/tel-00008776.
Texto completoZoghbi, Mohamad El. "Analyse électromagnétique et outils de modélisation couplés : Application à la conception hybride de composants et modules hyperfréquences". Limoges, 2008. https://aurore.unilim.fr/theses/nxfile/default/f3d13e75-6667-4684-84eb-37cfeebda8cc/blobholder:0/2008LIMO4044.pdf.
Texto completoIn this thesis, we propose several methods dedicated to a rapid optimization of microwave modules while taking into account the EM parasites phenomena : - One of theses approaches is dedicated to the optimization of modules MCM packaging. It combines the advantages of circuit simulation and the EM simulation. The disadvantages of the latter are limited by using of neural networks. - A second hybrid approach is dedicated to a fast optimization of the characteristics of quasi-TEM lines in a modular environment. - A third method of segmentation by digital access is proposed to the characterization of the effect of coupling between adjacent elements on a combination of space power. Finally, we describe how it would be possible to model the radiation of components by equivalent Huygens surfaces in a modular environment
Claudepierre, Ludovic. "Simulateur électromagnétique d'erreur VOR par méthodes déterministes : Application aux parcs éoliens". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15090/1/LCLAUDEPIERRE.pdf.
Texto completoSytova, Elizaveta. "Modeling of Iter and Asdex Upgrade detached plasmas using the Solps-Iter code with drifts and currents". Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0098.
Texto completoThe main goals of the present thesis are to:* investigate the differences between retention and leakage mechanisms of nitrogen and neon impurities in the context of the detachment formation;* compare the retention and leakage mechanisms of the nitrogen and neon impurities for the ASDEX Upgrade and ITER.To do this, the SOLPS-ITER code modeling package was further developed and then used. Modeling of ITER and ASDEX Upgrade scenarios with Ne and N impurity seeding was performed. The same ratio of radiated to input power ratio was maintained for all four modeling cases to make further comparisons possible. On the basis of the modeling, the following conclusions are made:* impurity transport from the divertor region upstream is found to be different for the neon and nitrogen impurities in both ITER and ASDEX Upgrade. Nitrogen is found to be better retained in the divertor volume than neon for both devices. * even though the retention and leakage of nitrogen and neon has the same mechanism in ITER and ASDEX Upgrade (nitrogen is better retained), in terms of the radiation distribution point of view thetwo machines behave differently. This difference suggests that neon impurity seeding seem to be an appropriate radiator for the ITER, even though for ASDEX Upgrade it results in an unacceptable radiation pattern
Donini, Julien. "Contribution à la construction et à la simulation du calorimètre électromagnétique de CMS au LHC". Phd thesis, Université Claude Bernard - Lyon I, 2002. http://tel.archives-ouvertes.fr/tel-00001885.
Texto completoAfin d'atteindre ce niveau de performances, plusieurs prototypes du calorimètre ont été mis en faisceau au cours des années 1999 et 2000. Une partie importante de cette thèse est consacrée à l'analyse des données obtenues lors de ces tests, avec pour objectif principal l'étude des paramètres jouant un rôle essentiel dans les performances du détecteur, en particulier la résolution en énergie, le suivi en lumière des cristaux et les performances de la chaîne électronique frontale dans sa version quasi-finale.
Un autre aspect de notre travail a été de développer une simulation comportant un haut degré de précision et de réalisme de la partie centrale du ECAL, à partir de l'outil de modélisation utilisé en physique des particules GEANT et d'une interface (EUGENIE) permettant d'intégrer des dessins de CAO dans la simulation. Cette description du détecteur a récemment été adoptée par la collaboration CMS et intégrée dans le programme de simulation officiel.
Laval, Damien. "Application de méthodes asymptotiques à la simulation de la diffraction électromagnétique par un corps régulier". Bordeaux 1, 2006. http://www.theses.fr/2006BOR13188.
Texto completoWainewright, Evelyn. "Efficient Simulation for Quantum Message Authentication". Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35213.
Texto completoChayé, Isabelle. "Modélisation par éléments finis de frontière de la diffraction électromagnétique des surfaces". Compiègne, 1991. http://www.theses.fr/1991COMPD424.
Texto completoBoyer, Alexandre. "Méthode de prédiction de la compatibilité électromagnétique des systèmes en boîtier". Toulouse, INSA, 2007. http://eprint.insa-toulouse.fr/archive/00000170/.
Texto completoIn order to achieve more powerful and denser electronic devices, the actual trend in microelectronic industry consists in integrating several circuits inside the same package. However it could involve electromagnetic incompatibility between the different circuits. This report describes some predictive methodologies dedicated to the impact of electromagnetic coupling between two nearby circuits, e. G. In the case of a module composed of a microcontroller and a power device. The first chapter is dedicated to the origin and the modelling of integrated circuit parasitic emission and susceptibility, and EMC problems related to system on package. Then the second chapter deals with integrated circuit near field radiated emission modelling, and the third chapter is dedicated to the susceptibility modelling of components disturbed by localized radiated aggression. Finally two methodologies aiming at predicting failure risks for two nearby components are proposed. They are based on the use of integrated circuit emission and susceptibility electrical models and allow testing the effect of placement and operating conditions on the electromagnetic compatibility
Muot, Nathanaël. "Stratégie d'hybridation de méthodes de simulation électromagnétique FDTD/MTL - application à l'étude de grands systèmes complexes -". Phd thesis, ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00841708.
Texto completoRochdi, Majid. "Signature électromagnétique bistatique d'une cible complexe placée sur une surface maritime rugueuse : modélisation, simulation et expérimentation". Brest, 2011. http://www.theses.fr/2011BRES2048.
Texto completoThe purpose of this thesis is to study the electromagnetic scattering phenomena involved on rough sea surface in the presence of a complex object. To solve this problem, we have studied and applied a model based on asymptotic methods. The basic idea is to combine a ray tracing-based algorithm with the physical optics, geometrical optic and the method of equivalents edge currents. The comprehensive geometrical model of the complex object and sea surface is designed by CAD (CATIA) tools and the sea power spectrum. The sea surface is generated by using the Elfouhaily directional wave spectrum. Both the target and the sea surface are meshed with triangular patches in order to compute the scattered field. The results obtained were compared with those published in the literature and with measurements carried out in an anechoic chamber
Muot, Nathanaël. "Stratégies d’hybridation de méthodes de simulation électromagnétique FDTD/MTL : Application à l’étude de grands systèmes complexes". Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0019/document.
Texto completoIn this thesis, we present a strategy based on a hybrid approach in the timedomain, by coupling 3D method (FDTD) with a multi-conductors transmission line (MTL)method, in order to simulate complex large scale electromagnetic problems. This reportgives the theoretical and numerical elements for coupling these approaches for two kindof problems, which are the multi domains approach and the multi scale approach. Themultiple domains approach is an extension of the classical FDTD method taking into accountseveral 3D subdomains, interconnected by a wire network, on which a 1D transmission lineformalism is used. The main issues are, on one hand to have an implicit expression ofthe electromagnetic field in the transmission line approach, and on the other hand to beable to take into account the ground effects on the induced currents, on the transmissionline parameters and on the electromagnetic field. The multi scale approach is developed toextend the capabilities of FDTD to deal with complex cables routing. We assume that thecross section of the cables are smallest than the cell size, and in these problems, the 1Dtransmission line problem is physically included in the 3D global computational domain.The work done in this thesis leaded to a new field to transmission line coupling based onthe common mode current, and an evaluation of the transmission. line parameters basedon a Laplace equation resolution in 2D. In this work, we have elaborated and proposedefficient numerical strategies for the computation of electromagnetic induced effects on largeand complex sites, composed of several interconnected distant buildings. An application tolightning problems have been done
Besse, Olivier. "Contribution à l'étude de la propagation électromagnétique en zone urbaine dans le domaine millimétrique". Limoges, 2000. http://www.theses.fr/2000LIMO0016.
Texto completoPosadas, Sergio. "Stochastic simulation of a Commander's decision cycle (SSIM CODE)". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA392113.
Texto completoThesis advisor(s): Paulo, Eugene P. ; Olson, Allen S. "June 2001." Includes bibliographical references (p. 111-115). Also available in print.
Umeda, Takayuki, Jun-ichiro Miwa, Yosuke Matsumoto, Takuma K. M. Nakamura, Kentaro Togano, Keiichiro Fukazawa y Iku Shinohara. "Full electromagnetic Vlasov code simulation of the Kelvin.Helmholtz instability". American Institute of Physics, 2010. http://hdl.handle.net/2237/14151.
Texto completoParachoniak, Ronald D. "Numerical experiments using an electrostatic, relativistic plasma simulation code". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26023.
Texto completoScience, Faculty of
Physics and Astronomy, Department of
Graduate
Aquino, João José Redondo de. "Structural numerical simulation code development with isogeometric anakysis (IGA)". Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22375.
Texto completoIn the present day most product development industries uses the Finite Element Method (FEM) for structural analysis. Designers model the product geometries using Computer-Aided Design (CAD) software, the geometries are then fitted for analysis, by the analysts, with a mesh approximation that inevitably results in loss of accuracy. Achieving the best geometry description for complex components can be a complex task and it can take a lot of time. Considering this drawback, a new method was developed which takes advantages of curve representation tools and uses them as bases for analysis. Aiming for no loss of geometrical precision, this new method has been called "Isogeometric Analysis" (IGA). The smoothness of Spline representations used in Isogeometric Analysis can be useful for a particular branch of structural analysis which is the analysis of plates and shells. The classic thin plate theory developed by Gustav Kirchhoff requires a geometry description with C1 continuity between elements which is normally defined by high order polynomial functions, which typically represents a problem with the piecewise Lagrangian shape functions used in conventional FEM. The present work explores parametric descriptions used as basis for Isogeometric Analysis, such as Bézier curves, B-splines and NURBS, taking advantage of its smoothness to develop formulations for thin plate elements. The 4-node rectangular derived by Melosh, O. Zienkiewicz and Y. Chung called MCZ thin plate element based on Kirchhoff assumptions, was the starting point to build up to a NURBS-based thin plate element. MCZ thin plate elements, NURBS-based thin plate elements (with different order geometries) and Abaqus commercial software shell elements are evaluated by means of classical plate benchmarks comparing the elements convergences and overall performance. It can be shown that the proposed NURBS-based formulation is reliable for the analysis of thin structures.
Nos dias de hoje a maioria da indústria de desenvolvimento do produto utiliza o Método dos Elementos Finitos (MEF) na análise estrutural. Os desenhistas modelam o produto através de ferramentas de Computer-Aided Design (CAD). As geometrias são depois ajustadas para a análise pelos analistas que constroem uma aproximação através de uma malha de elementos finitos, o que inevitavelmente resulta numa perda de precisão geométrica. Para conseguir a melhor aproximação à geometria original para componentes complexos o processo pode ser complicado e pode consumir muito tempo. Considerando esta desvantagem foi desenvolvido um novo método que tira partido da descrição geométrica das ferramentas de desenho e utiliza as funções base das curvas para analise, com o objectivo de não haver perda de precisão geométrica, este novo método tem o nome de “Análise Isogeométrica” (IGA). A suavidade das geometrias Splines usadas na análise isogeometrica pode ser muito útil num ramo particular da análise estrutural, no estudo das placas e cascas. A teoria clássica de análise de placas finas de Kirchhoff requer uma descrição geométrica que tenha continuidade C1 entre elementos, que é normalmente definida por polinómios de ordem elevada, que são tipicamente um problema para as funções de forma Lagrangeanas usadas em MEF. O presente trabalho explora as descrições geométricas utilizadas como funções de forma para a análise isogeométrica como as curvas de Bézier, as B-splines e as NURBS, tirando vantagem da facilidade de estas conseguirem a requerida continuidade entre elementos para criar elementos de placas finas com as funções de base NURBS como funções de forma. É utilizado o elemento de placa fina MCZ desenvolvido por Melosh, O. Zienkiewicz e Y. Chung com base nas premissas de Kirchhoff como ponto de partida para desenvolver o elemento com base em NURBS. No fim os elementos de placas finas MCZ, os elementos com funções de base NURBS (com geometrias de diferentes ordens) e elementos do tipo casca do software comercial Abaqus são avaliados através de uma série de diferentes problemas clássicos de placas, comparando a convergência e o desempenho global. É possivel ver que a formulação proposta é fidedigna na análise de estruturas de placa fina.
Pardo-Gibson, Oscar. "Etude et simulation temporelle de la susceptibilité électrompagnétique de systèmes interconnectés". Ecully, Ecole centrale de Lyon, 1987. http://www.theses.fr/1987ECDL0019.
Texto completoFourniols, Jean-Yves. "Contribution à l'étude des problèmes de compatibilité électromagnétique dans les systèmes micro-électroniques submicroniques". Toulouse, INSA, 1996. http://www.theses.fr/1996ISAT0003.
Texto completoLECHOWSKI, MATTHIEU. "Test du modèle du Petit Higgs dans ATLAS au LHC. Simulation de la numérisation du calorimètre électromagnétique". Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00010253.
Texto completoLechowski, Matthieu. "Test du modèle du petit Higgs dans ATLAS au LHC : simulation de la numérisation du calorimètre électromagnétique". Paris 11, 2005. https://tel.archives-ouvertes.fr/tel-00010253.
Texto completoLHC is a proton-proton collider with an energy of 14 TeV in the center of mass, which will start in 2007 at CERN. Two of its experiments, ATLAS, and CMS, will search and study in particular the Higgs boson, Supersymmetry and other new Physics. This thesis was about two aspects of the ATLAS experiment. On one hand the simulation of the liquid Argon electromagnetic calorimeter, with the emulation of the electronic chain in charge of the digitization of the signal and also the evaluation of the electronic noise and the pile-up noise (coming from minimum bias events of elastic collisions at LHC). These two points have been validated by the analysis of the data taken during testbeams in 2002 and 2004. On the other hand, a physics study concerning the Little Higgs model. This recent model solves the hierarchy problem of the Standard Model, in introducing new heavy particles to cancel quadratic divergences arising in the calculation of the Higgs boson mass. These new particles, with a mass about the TeV, are one heavy quark top, heavy gauge bosons Z', W' and A', and a heavy Higgs bosons triplet. The physics study dealt with the characteristic decays of the model, Z' in Z+H and W in W+H, with a Higgs mass either at 120 GeV decaying in two photons or at 200 GeV decaying in ZZ or WW. Results show that in both cases, for 300fb-1 (3 years at high luminosity), an observation of the signal at 5 sigma for Z' et W' masses less than 2 TeV is possible, covering a large part of the parameter space