Academic literature on the topic 'Modélisation deux-Échelles'
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Journal articles on the topic "Modélisation deux-Échelles"
Calvet, Jean-Christophe, and Jean-Louis Champeaux. "L'apport de la télédétection spatiale à la modélisation des surfaces continentales." La Météorologie, no. 108 (2020): 052. http://dx.doi.org/10.37053/lameteorologie-2020-0016.
Full textBeven, K., A. Musy, and C. Higy. "Tribune Libre : L'unicité de lieu, d'action et de temps." Revue des sciences de l'eau 14, no. 4 (April 12, 2005): 525–33. http://dx.doi.org/10.7202/705431ar.
Full textBouguerra, Sid Ahmed, Abderrazak Bouanani, and Kamila Baba-Hamed. "Transport solide dans un cours d’eau en climat semi-aride : cas du bassin versant de l’Oued Boumessaoud (nord-ouest de l’Algérie)." Revue des sciences de l’eau 29, no. 3 (February 13, 2017): 179–95. http://dx.doi.org/10.7202/1038923ar.
Full textPHOCAS, F., J. BOBE, L. BODIN, B. CHARLEY, J. Y. DOURMAD, N. C. FRIGGENS, J. F. Hocquette, et al. "Des animaux plus robustes : un enjeu majeur pour le développement durable des productions animales nécessitant l’essor du phénotypage fin et à haut débit." INRAE Productions Animales 27, no. 3 (August 28, 2014): 181–94. http://dx.doi.org/10.20870/productions-animales.2014.27.3.3066.
Full textBeguin, Rémi, Laurence Duchesne, Christophe Picault, Jean-Jacques Fry, Jean-Robert Courivaud, and Pierre Philippe. "Modélisation physique de l’initiation et la progression de l’érosion de contact au sein des digues de canaux typiques des aménagements du Rhin et du Rhône." Revue Française de Géotechnique, no. 168 (2021): 4. http://dx.doi.org/10.1051/geotech/2021014.
Full textSiegelman, Lia. "Le rôle climatique des fronts océaniques de fine échelle en profondeur (prix Prud'homme 2020)." La Météorologie, no. 114 (2021): 038. http://dx.doi.org/10.37053/lameteorologie-2021-0069.
Full textBONNEAU, M., J. Y. DOURMAD, B. LEBRET, M. C. MEUNIER-SALAÜN, S. ESPAGNOL, Y. SALAÜN, P. LETERME, and H. VAN DER WERF. "Evaluation globale des systèmes de production porcine et leur optimisation au niveau de l’exploitation." INRAE Productions Animales 21, no. 4 (September 27, 2008): 367–86. http://dx.doi.org/10.20870/productions-animales.2008.21.4.3413.
Full textPinel-Alloul, B., A. Mazumber, G. Lacroix, and X. Lazzaro. "Les réseaux trophiques lacustres: structure, fonctionnement, interactions et variations spatio-temporelles." Revue des sciences de l'eau 11 (April 12, 2005): 163–97. http://dx.doi.org/10.7202/705337ar.
Full textDONNARS, C., P. CELLIER, and J. L. PEYRAUD. "Nouvelles de la recherche : expertise sur les flux d’azote liés aux élevages." INRAE Productions Animales 25, no. 4 (October 2, 2012): 389–92. http://dx.doi.org/10.20870/productions-animales.2012.25.4.3226.
Full textLoireau, Maud, Mireille Fargette, Moussa Dieng, and Moussa Sall. "Cadre conceptuel pour l’étude de la relation société-milieu : attache et insertion au monde." BASE, 2023. http://dx.doi.org/10.25518/1780-4507.20308.
Full textDissertations / Theses on the topic "Modélisation deux-Échelles"
Durand, Pierre-Yves. "Modélisations multiphysiques à deux échelles du procédé de fabrication additive par fusion laser de lit de poudre." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4012.
Full textRegardless the industry, additive manufacturing processes for metallic materials have a great industrial potential, especially to product high added value parts. One of the main users of these processes, and more specifically the Selective Laser Melting (SLM), is the tooling industry for plastics processing. It make possible to reduce production costs and manufacturing times while increasing the complexity of manufactured parts. However, in order to improve the quality of the latter and ensure their certifications, a better insight into the related physical phenomena undergone by the material during the process is still needed. In this PhD thesis, the SLM process modeling is multiphysic and concerns two different scales. The first modeling scale uses the Volume Of Fluid method to model the powder bed melting and its ensuing solidification. The numerical powder bed is computed thanks to a specific generator enabling to take account for the experimental granulometry. Once some simplifying assumptions on the physical phenomena stated, the surface tension has been implemented requiring the "heights functions" method use. The second modeling scale corresponds to the building of laser tracks series through the finite element method. The thermomechanical approach uses the element birth method in order to meet as far as possible the experimental conditions. Following its assessment through experiment/simulation face off, model have enable to predict the temperature field and the melted zone width as well as the keyhole formation
Sebert-Cuvillier, Emmanuelle. "Modélisation de la dynamique invasive du cerisier tardif (Prunus serotina Ehrh. ) en système forestier tempéré à deux échelles spatiales." Amiens, 2008. http://www.theses.fr/2008AMIE0102.
Full textKader, Mahamane. "Contributions à la modélisation et au contrôle des systèmes intelligents distribués : application au contrôl des vibrations d'une poutre." Université de Besançon, 2000. http://www.theses.fr/2000BESA2018.
Full textWe present a new approach for the design of intelligent distributed systems for the control of beam vibrations. We construct a distributed analog circuit that approximates an optimal control law, with an observation and control system using distributed piezoelectric transducers. […] We propose a parameterization of the dynamic controllers H infinite for linear equations of state of finite dimension. […] A stabilization study was carried out on the model with constant coefficients. The theoretical results obtained were validated by numerical calculations
Tran, Ngoc Tien Dung. "Transport de solutés dans un milieu à double-porosité non saturé. Modélisation par homogénéisation et applications." Phd thesis, Grenoble 1, 2008. http://www.theses.fr/2008GRE10097.
Full textThis Ph. D thesis presents the development of the solute transport models in unsaturated double-porosity medium, by using the asymptotic homogenization method. The obtained macroscopic models concern diffusion, diffusion-convection and dispersion-convection, according to the transport regime which is characterized by the non-dimensional numbers. The models consist of two coupled equations that show the local non-equilibrium of concentrations. The double-porosity transport models were numerically implemented using the code COMSOL Multiphysics (finite elements method), and compared with the solution of the same problem at the fine scale. The implementation allows solving the coupled equations in the macro- and micro-porosity domains (two-scale computations). The calculations of the dispersion tensor as a solution of the local boundary value problems, were also conducted. It was shown that the dispersivity depends on the saturation, the physical properties of the macro-porosity domain and the internal structure of the double-porosity medium. Finally, two series of experiments were performed on a physical model of double-porosity that is composed of a periodic assemblage of sintered clay spheres in Hostun sand HN38. The first experiment was a drainage experiment, which was conducted in order to validate the unsaturated flow model. The second series was a dispersion experiment in permanent unsaturated water flow condition (water content measured by gamma ray attenuation technique). A good agreement between the numerical simulations and the experimental observations allows the validation of the developed models
Tran, Ngoc Tien Dung. "Transport de solutés dans un milieu à double-porosité non saturé. Modélisation par homogénéisation et applications." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00327123.
Full textHui, Hui. "Contribution à la modélisation et au contrôle d'une matrice d'AFM." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-00827715.
Full textDavidović, Andjela. "Modélisation mathématique multi-échelle des hétérogénéités structurelles en électrophysiologie cardiaque." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0448/document.
Full textIn this thesis we addressed two problems in mathematical modelling of propagation of electrical signals in the heart: tissue scale propagation with presence of tissue heterogeneities and cell scale propagation with non-linear gap junctions. Diffusive inclusions. The standard model used in cardiac electrophysiology is the bidomain model. It is an averaged model derived from the microscopic properties of the tissue.The bidomain model assumes that the electrically active myocytes are present uniformly everywhere in the heart. While this is a reasonable assumption for healthy hearts, it fails insome pathological cases where significant changes in the tissue structure occur, for examplein ischaemic and rheumatic heart disease, inflammation, hypertrophy, or infarction. These tissue heterogeneities are often taken into account through an ad-hoc tuning of model parameters. The first aim of this thesis consisted in generalizing the bidomain equations to the case of structural heart diseases.We assumed a periodic alternation of healthy (bidomain model) and altered (diffusive inclusion) tissue patches. Such a model may be simulated directly, at the high computational cost of a very fine discretisation. Instead we derived a homogenized model at the macroscopic scale, using a rigorous two-scale analysis. We recovered a bidomain-type model with modified conductivity coefficients, and performed a 2D numerical verificationof the convergence of the microscopic model towards the homogenized one.In the second part we quantified the effects of different shapes and sizes of diffusive inclusions on the effective conductivity coefficients and their anisotropy ratios in 2D and3D. Additionally, we ran simulations on 2D patches of tissue with modified conductivity coefficients. We observed changes in the propagation velocity as well as in the shape of the depolarization wave-front.In the third part, based on high-resolution MR images of a rat heart we simulated 3D propagations with the homogenized model. Using image analysis software tools we assessed the structural properties of the tissue, that we used afterwards as parameters inthe homogenized model. Non-linear gap junctions. In the last part of this thesis, we studied the effects of nonlineargap junction channels on the signal propagation at the cell scale. In existing models, the gap junction channels, if modelled, are assumed to have a linear behaviour, while from experimental data we know that they have a time- and voltage-dependent non-linear behaviour. Firstly, we stated a non-linear 0D model for the gap junctional current, and secondly fitted the model to available experimental data. Finally, we proposed a 2D mathematical model that describes the electrical interaction of cardiac myocytes on the cell scale. It accounts for the gap junctional current as "the direct link" between the adjacent cells
Graux, Nicolas. "Caractérisation et modélisation des propriétés à la fatigue à grand nombre de cycles des aciers cémentés à partir d'essais d'auto-échauffement sous sollicitations cycliques." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0104.
Full textThe rolling contact fatigue prediction between two carburizing part quickly becomes complex.On one hand, the carburizing treatment give heterogeneous properties in surface layer depending on the treatment protocol. On the other hand, the rolling contact load is a complex load with a fatigue initiation in the sub-layer. To limit the duration of the field fatigue properties characterization, self-heating measurements under cycle load are used and their interpretation by a probabilistic two scales model is proposed. Nevertheless applying this fatigue evaluation method on heterogeneous material and for rolling contact load can be difficult. ln first approach those difficulties are split.To take into account the material heterogeneity, an analysis based on a variation of one probabilistic two scales model and on carbon rate measurement is proposed. Model parameters are identified on one steel class with self-heating measurement made on specimens representative of carburizing material heterogeneity. Finally the model is validated by comparison with experimental fatigue point.Making self-heating measurement for rolling contact load is complex. Consequently a first self-heating measurement campaign is made on the intermediary case of repeated contact. With a simple analytic model, the temperature field evolution can be linked to a mean heat source whose link with fatigue mechanism must be proven. Finally, rolling contact machine prototypes are proposed. Self-heating measurement made on those prototypes and their interpretation suggest that it will be possible to identify fatigue properties with self-heating measurement
Amani, Yasin. "Modélisation basée sur données de tomographie aux rayons X de l'endommagement et de la conductivité thermique dans les matériaux cellulaires métalliques." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI036/document.
Full textThe properties of cellular materials depend on their architecture and casting defects. The architecture refers to shape and distribution of the solid phase. Defects correspond to the presence and distribution of cavities or intermetallic particles in the solid phase due to the fabrication procedure. Two types of materials produced by different fabricating routes are studied in this manuscript. On the one hand, two ERG foams with different cell sizes were chosen to study the effect of the presence of intermetallic particles on the plasticity and damage. Micro-tensile tests and nanoindentation experiment were also performed on the struts extracted from the foam to determine their micro elastoplastic behaviour. On the other hand, two structures with the same shape and repetitive pattern but different struts and nodes thicknesses were produced by selective laser melting manufacturing route to study the effect of porosity on plasticity and damage. This PhD-work aimed at developing a generic image-based finite element procedure to take into account the effect of the local porosity and the presence of intermetallic particles into the finite element simulations of the cellular materials. The initial state of the samples was pictured by performing high resolution "local" tomography and "stitching" methods. The 3D geometries were meshed and the local porosity and elastic-plastic properties of each element were directly informed according to high-resolution 3D images. The deformation and fracture procedures of the samples were pictured by performing in-situ/ex-situ experiments coupled with low-resolution tomography scanning. 3D image-based finite element models were developed for the simulation of the tension/compression tests. The microstructurally informed FE models better capture the mechanical behaviour of the cellular structures, especially for the prediction of the fracture. The study also aimed at determining the thermal conductivity of a highly porous ERG foam using image-based finite element calculations. The results were verified by comparing with the measured thermal conductivity from guarded hot plates experiments
Nguyen, Duy Duc. "Modeling a micro-mirror array and contribution to the development of a simulator of micro-system arrays." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD087.
Full textIn this thesis, we contribute to the modeling, simulation and optimization of a new generation of micro mirror arrays designed by the Astrophysics Laboratory of Marseille (LAM). A contribution is also made to the development of MEMSALab a symbolic computation software package designed to asist multiscale model derivation for microsystem arrays. The coupling between the quasi-static nonlinear behavior of a cell of the micro-mirror array and the electrostatic field used for its actuation is simulated. The simulation is then used to study the phenomenon of pull-in and its optimization. Then, a homogenized model for the electrostatic field in the vacuum space surrounding in the micro-mirror array has been built using an asymptotic method. The contributions to the development of MEMSALab consist in the introduction of an extension and combination theory that will be used to construct multiscale models based on various asymptotic approaches by a process of successive complexifications. Finally, a complete specification language for using MEMSALab is presented and illustrated by significant examples. In particular, it was used to encode the derivation of a homogenized model that serves as an initial state to the extension-combination method
Book chapters on the topic "Modélisation deux-Échelles"
YASTREBOV, Vladislav A. "Méthodes numériques en contact micromécanique." In Modélisation numérique en mécanique fortement non linéaire, 87–145. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9081.ch3.
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