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Literatura académica sobre el tema "Code Europlexus"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Code Europlexus"

Velikorodny, A., E. Studer, S. Kudriakov y A. Beccantini. "Combustion modeling in large scale volumes using EUROPLEXUS code". Journal of Loss Prevention in the Process Industries 35 (mayo de 2015): 104–16. http://dx.doi.org/10.1016/j.jlp.2015.03.014.

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Potapov, Serguei y Pascal Galon. "Modelling of Aquitaine II pipe whipping test with the EUROPLEXUS fast dynamics code". Nuclear Engineering and Design 235, n.º 17-19 (agosto de 2005): 2045–54. http://dx.doi.org/10.1016/j.nucengdes.2005.05.012.

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Potapov, Serguei, Fabienne Bliard y François Téphany. "Simulation de la décompression du réacteur HDR avec le code de dynamique rapide EUROPLEXUS". Revue Européenne des Éléments Finis 11, n.º 5 (enero de 2002): 667–94. http://dx.doi.org/10.3166/reef.11.667-694.

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Saarenheimo, Arja, Michael Borgerhoff, Kim Calonius, Anthony Darraba, Alexandre Hamelin, Sara Ghadimi Khasraghy, Amin Karbassi et al. "Numerical studies on vibration propagation and damping test V1". Rakenteiden Mekaniikka 51, n.º 1 (16 de agosto de 2018): 55–80. http://dx.doi.org/10.23998/rm.68954.

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Earthquakes and aircraft impacts induce vibrations that propagate throughout the entire building and they need to be considered in designing SSCs (Structures, Systems and Components). Mainly linear calculation methods have been in use in design practice and the codes and standards consider damping ratios only for linear structural analyses. Induced vibrations, especially in damaged concrete structures, have not been studied extensively enough for optimization of structural frameworks and/or qualified systems and components. Experimental data on damping properties of damaged reinforced concrete are needed also for benchmarking analysis programs and methods. Recently, within IMPACT project, a new type of test series considering vibration propagation has been carried out at VTT. The test target is a reinforced concrete structure with two parallel walls connected to a floor slab. The front wall is additionally supported by triangular shaped side walls which are connected to the floor slab too. The test structure is supported on elastomeric bearing pads, with back pipes effective mainly in compression and with bars effective in tension. In order to obtain information on vibration propagation in damaged concrete structure at different levels of damage grades the same structure was tested six times. At each time the mass of the deformable stainless steel missile was 50 kg. The hit point located in the middle of the front wall. The impact velocity was about 110 m/s in the first four tests (V1A-D) and about 60 m/s in the remaining two tests (V1E and F). In this paper, numerical results on tests V1A and V1F are compared with the corresponding experimental ones. The calculated results, such as accelerations, displacements, their response spectra and strains, are compared with experimental measurements. Five finite element (FE) programs are used in computations: Abaqus, Europlexus, LS-DYNA, SOFiSTiK and an in-house code (IHC). Most of the FE-codes in the present study use shell elements. In Abaqus and SOFiSTiK non-linear behaviour of shell section is modelled by dividing the cross section into layers. Reinforcements are also modelled as layers. In Europlexus and IHC, an alternative approach is adopted in which the non-linear behaviour of concrete and reinforcement is homogenized beforehand in the shell thickness direction obtaining relations between stress resultants and generalized strains valid for the shell section. In LS-DYNA, 3D solid elements for modelling concrete and beam elements for modelling reinforcements are used. Equations of motion are integrated with explicit central difference time integration method, except in SOFiSTiK implicit integration method is used. Modelling and computations with the mentioned FE-programs are made independently of each other. Computations with LS-DYNA are carried out as blind exercises. Consideration of the results from benchmarking point of view is still on-going. However it is evident that analysed results follow reasonable well test results in main design parameter level such as maximum displacements, accelerations and strains. Also frequency spectra are estimated reasonably well.

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Julien, Tristan, Vincent Faucher, Laurent Pantera, Guillaume Ricciardi y Emmanuelle Sarrouy. "Numerical Study of Coupled Fluid and Solid Wave Propagation Related to the Cladding Failure of a Nuclear Fuel Rod". Applied Sciences 12, n.º 4 (9 de febrero de 2022): 1784. http://dx.doi.org/10.3390/app12041784.

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Fuel rod cladding failure in a nuclear reactor produces different phenomena related to vibrations and fluid–structure interaction. The most significant aspect of those phenomena is the creation of a pressure wave at the failure position and its propagation in the coolant fluid flowing around the fuel rod. An accurate understanding of the propagation of the pressure wave around the fuel rod can help us design a method to detect a failure, determine its position, and estimate some of its characteristics with a single and simple sensor, such as a pressure sensor or a piezoelectric acoustic sensor, that can be mounted relatively far from the failure. Such a method can be useful for the monitoring of nuclear fuel rods, where instrumentation possibilities are restricted (because of neutron flux, radiation, high temperature, and available space) as well as for any kind of application involving annular ducts and limited instrumentation possibilities. The current paper is related to the specific application of nuclear fuel rod monitoring. It deals with preliminary numerical simulations that are necessary to know the evolution of a fluid pressure profile along the system containing the rod. They are carried out by finite element methods, using the EUROPLEXUS code. They provide the necessary information about the propagation of pressure waves around the rod to design measurement and signal processing methods as well as properly interpret experimental results from tests in industrial reactors, research reactors, or experimental mock-ups. They also provide some information that could not be experimentally obtained because of the constraints in a nuclear environment. Despite the specific application we show in this article, similar calculation methods, theoretical observations, and results interpretations can be easily adapted to the other mentioned applications.

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Larcher, Martin, Martien Teich, Norbert Gebbeken, George Solomos, Folco Casadei, Grecia A. Falcon y Sonja L. Sarmiento. "Simulation of Laminated Glass Loaded by Air Blast Waves". Applied Mechanics and Materials 82 (julio de 2011): 69–74. http://dx.doi.org/10.4028/www.scientific.net/amm.82.69.

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In this paper, several material models are analyzed in order to represent and compare the behaviour of laminated glass subjected to blast loads. LS-DYNA and EUROPLEXUS are used for numerical simulation. These codes have different capabilities to describe the mechanical problem, especially the failure behaviour. The results of the simulations are compared to laboratory experimental results in order to validate the accuracy of the material models.

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Sohier, Devan, Pablo De Oliveira Castro, François Févotte, Bruno Lathuilière, Eric Petit y Olivier Jamond. "Confidence Intervals for Stochastic Arithmetic". ACM Transactions on Mathematical Software 47, n.º 2 (abril de 2021): 1–33. http://dx.doi.org/10.1145/3432184.

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Quantifying errors and losses due to the use of Floating-point (FP) calculations in industrial scientific computing codes is an important part of the Verification, Validation, and Uncertainty Quantification process. Stochastic Arithmetic is one way to model and estimate FP losses of accuracy, which scales well to large, industrial codes. It exists in different flavors, such as CESTAC or MCA, implemented in various tools such as CADNA, Verificarlo, or Verrou. These methodologies and tools are based on the idea that FP losses of accuracy can be modeled via randomness. Therefore, they share the same need to perform a statistical analysis of programs results to estimate the significance of the results. In this article, we propose a framework to perform a solid statistical analysis of Stochastic Arithmetic. This framework unifies all existing definitions of the number of significant digits (CESTAC and MCA), and also proposes a new quantity of interest: the number of digits contributing to the accuracy of the results. Sound confidence intervals are provided for all estimators, both in the case of normally distributed results, and in the general case. The use of this framework is demonstrated by two case studies of industrial codes: Europlexus and code_aster.

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Chuzel-Marmot, Yann, Alain Combescure y Roland Ortiz. "Explicit dynamics “SPH – Finite Element” coupling using the Arlequin method". European Journal of Computational Mechanics, 9 de julio de 2008, 737–48. http://dx.doi.org/10.13052/remn.17.737-748.

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The Arlequin method gives a simple and effective framework to glue models using various formulations. It is extended here in explicit dynamics and used in order to link a zone showing ruptures by fragmentation meshed with Smoothed Particles Hydrodynamics (SPH) and a larger second undamaged one meshed with finite elements (FEM). This paper gives some details on the method implemented in the EUROPLEXUS code, its validation on simple benchmarks and a confrontation between numerical simulations and results of an experimental study of concrete slab resistance to projectile impacts.

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Robbe, M. F. "A Porosity Method to Describe Complex 3D-Structures Theory and Application to an Explosion". Acta Polytechnica 46, n.º 3 (3 de enero de 2006). http://dx.doi.org/10.14311/828.

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A theoretical method was developed to be able to describe the influence of structures of complex shape on a transient fluid flow without meshing the structures. Structures are considered as solid pores inside the fluid and act as an obstacle for the flow. The method was specifically adapted to fast transient cases.The porosity method was applied to the simulation of a Hypothetical Core Disruptive Accident in a small-scale replica of a Liquid Metal Fast Breeder Reactor. A 2D-axisymmetrical simulation of the MARS test was performed with the EUROPLEXUS code. Whereas the central internal structures of the mock-up could be described with a classical shell model, the influence of the 3D peripheral structures was taken into account with the porosity method.

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Tesis sobre el tema "Code Europlexus"

Le, Nôtre Yvan. "Etude de la réponse dynamique du Bloc Réacteur soumis à une sollicitation extrême : Co-simulation implicite/explicite multi-échelle en temps pour la dynamique du contact". Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0055.

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Les centrales nucléaires sont une source de production d'énergie importante en France. Cependant, suite aux différents accidents et aux risques encourus avec cette technologie, la sûreté nucléaire est une préoccupation mondiale. En France, des normes sont imposées continuellement sur les installations nucléaires existantes et sur les prochaines générations en développement. Parmi les nombreux aspects de la sûreté nucléaire, le dimensionnement des structures mécaniques est un sujet important pour les acteurs industriels. L'activité principale de l'entreprise Framatome concerne le dimensionnement et la justification des centrales nucléaires. Celles-ci doivent être conçues pour résister à des conditions extrêmes d'utilisation telles que des séismes, des crashs d'avion ou encore des ruptures de tuyauterie. La modélisation numérique de ce type de chargement passe par des analyses dynamiques temporelles afin de considérer ces phénomènes multi-échelles en temps. Cependant, réaliser ces analyses demande beaucoup de temps CPU et de mémoire. L'objectif de la thèse est le développement d'un nouvel intégrateur hétérogène (différents schémas d'intégration) asynchrone (différents pas de temps), basé sur la méthode de couplage GC, ayant de meilleures propriétés relatives à la conservation énergétique. En effet, les phénomènes multi-échelles en temps présents dans le bloc réacteur sont des cas d'usages favorables aux méthodes multi-échelles en temps, avec un intégrateur explicite pour les zones de contact, comportant une discrétisation temporelle fine, et un intégrateur implicite pour le reste de la structure, discrétisé par des pas de temps plus gros. Un démonstrateur de co-simulation est développé entre les logiciels Code Aster et Europlexus pour se rapprocher d'un développement industriel et ainsi montrer le gain de performance, pour un modèle tridimensionnel de bloc réacteur, apporté par les approches de co-simulation multi-échelles en temps
Nuclear power plants are an important source of energy production in France. However, following the various accidents and risks associated with this technology, nuclear safety is a global concern. In France, standards are continually being imposed on existing nuclear facilities and on the next generations under development. Among the many aspects of nuclear safety, the dimensioning of mechanical structures is an important subject for industrial players. Framatome's core business is the design and justification of nuclear power plants. These must be designed to withstand extreme operating conditions, such as earthquakes, plane crashes or pipe ruptures. Numerical modeling of this type of loading requires dynamic temporal analyses to consider these multi-scale phenomena. However, such analyses are CPU and memory intensive. The aim of this thesis is to develop a new heterogeneous (different integration schemes) and asynchronous (different time steps) integrator, based on the GC coupling method, with improved energy conservation properties. The multi-scale phenomena present in the reactor block are simulated using an explicit integrator with small time steps for the contact zones and an implicit integrator with large time steps for the rest of the structure. A co-simulation demonstrator is developed between the Code Aster and Europlexus software packages in order to get closer to an industrial development and thus demonstrate the performance gain, for a three-dimensional reactor block model, provided by the multi-time-scale co-simulation approaches

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Actas de conferencias sobre el tema "Code Europlexus"

De Lorenzo, Marco, Philippe Lafon, Yann Bartosiewicz y Jean-Marie Seynhaeve. "Physical and Numerical Investigations for the Development of a New Experimental Facility for Studying Blowdown Phenomena". En 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60988.

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Electricité de France (EDF), with the scientific cooperation of Université Catholique de Louvain (UCL), is starting new investigations about the blowdown phenomena. For these purposes, EDF is considering to build a new experimental installation called BRECHE. In this article, the main features of the design of the test rig are presented together with the numerical simulation carried out with EUROPLEXUS code for the hydraulic and mechanical design of BRECHE.

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Kudriakov, S., E. Studer, M. Kuznetsov y J. Grune. "Experimental and Numerical Investigation of H2-Air Deflagration in the Presence of Concentration Gradients". En 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16910.

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A set of experiments performed at Karlsruhe Institute of Technology (KIT) in the framework of the LACOMECO European project is devoted to flame propagation in an obstructed large scale facility A3 (of 8 m height and 33 m3 volume) with initially vertical hydrogen concentration gradients. Almost linear positive and negative (relative to gravity) concentration gradients are created prior to ignition in the range from 4% to 13%, and the process of flame acceleration is investigated depending on hydrogen concentration gradient and ignition positions. In this paper we describe the A3 facility and analyse the experimental data obtained during the project. The results of numerical simulation performed using Europlexus code are presented together with the critical discussions and conclusions.

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Herran, Mathieu, Herve´ Chalons, Daniel Ne´lias y Roland Ortiz. "Prediction of Engine Mounting Loads in Transient Dynamic Response Under Blade Shedding Unbalance". En ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59615.

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For the TURBOMECA new generation turboshaft engines, overspeed electronic protection of the free turbine is coupled with a mechanical protection called “Blade Shedding”. This mechanical protection is provided by the rupture of all the turbine blades and the retention of the generated debris by a dedicated containment shield. During Blade Shedding, significant transient loads are transmitted to the helicopter frame through the engine mountings. The prediction of the transient loads within the turbine engine itself and those transmitted through the engine mountings is of first importance in order to plan and reduce the number of development engine tests. These loads come on one hand from impacts on the blade housing, and on the other hand from the rotor unbalance. The effects of the rotor dynamics were first implemented in the finite element code Europlexus (a Computer Program for the Finite Element Simulation of Fluid-Structure Systems under Transient Dynamic Loading) to take into account gyroscopic effects. Then the analysis of an academical test case demonstrates the relevance of the method. Finally a blades-off sequence is simulated on an industrial whole engine model and the mounting loads due to unbalance are investigated. The various assumptions made in this simulation are then discussed and the results are compared to test results.

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Julan, Emricka, Said Taheri, Claude Stolz, Patrice Peyre y Philippe Gilles. "Numerical Simulation of Laser Shock Peening in Presence of Weld for Fatigue Life Design". En ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28400.

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Laser shock peening (LSP) is a surface mitigation technique that can be applied to improve the life of a metallic component through the generation of a compressive surface stress field induced by high-power laser pulses. Numerical simulation of LSP (produced residual stresses) in presence of an initial stress field similar to those obtained under welding has been carried out in nonlinear dynamic by coupling an explicit code (Europlexus) and an implicit one (Code_Aster). In the first step, an axisymetrical model has been validated by comparison with an analytical solution considering an elastic-perfectly plastic behavior law. Then, comparisons with Abaqus calculations have been carried out in terms of displacements and residual stresses using the Johnson-Cook high strain rate constitutive law to validate multi-impact 3D modeling. High strain rate parameter of Johnson-Cook law has been identified using LSP on thin plates. Validations of the simulations are then performed by comparing with experimental determined deformations caused by LSP on thick plates. For 25 overlapped shots, LSP induced residual stresses calculated with and without initial residual stresses similar to those obtain under welding have been compared to adress the effect of initial stresses on final residual fields.

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