Literatura académica sobre el tema "Impact fluide-Structure"
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Artículos de revistas sobre el tema "Impact fluide-Structure"
LÉONIL, J., M. C. MICHALSKI y P. MARTIN. "Les structures supramoléculaires du lait : structure et impact nutritionnel de la micelle de caséine et du globule gras". INRAE Productions Animales 26, n.º 2 (17 de abril de 2013): 129–44. http://dx.doi.org/10.20870/productions-animales.2013.26.2.3142.
Texto completoTesis sobre el tema "Impact fluide-Structure"
Aquelet, Nicolas. "Modélisation de l'impact hydrodynamique par un couplage fluide-structure". Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-Aquelet.pdf.
Texto completoConstantinescu, Adrian. "Modélisation 2D de l’impact d’une structure sur l’eau : initiation de l’endommagement". Brest, 2006. http://www.theses.fr/2006BRES2037.
Texto completoThe research work in this thesis covers the modeling of the impact of a 2D body with water and the subsequent appearance of macroscopic fractures. The main application is the modeling of the slamming forces acting on the ship structure in severe sea conditions. The time-dependent stresses and strains on a ship hull can provoke a premature mechanical failure due to fatigue. The main work consists in the development and validation of a numerical tool (lmpact++ ABAQUS) simulating the fluid-structure interaction during the violent impact of a body of a simple geometry (wedge, cone, cylinder, sphere, axisymmetric parabolic body, ellipsoid, etc) on a free water surface. This approach considers the effect of the deformation of the structure on the flow and vive versa. The numerical tool is based on the commercial finite element code ASAQUS and permits to calculate thee stresses and deformations, energies and the global forces for a 2D solid structure inipacting a fluid. In view of the long-term goal of aiding structural design of ships, the second objective was to bring a quantitative and qualitative representation of the beginning of the damage of a metallic structure impacting water, namely to predict the time and location of fracture initiation due to repeated slamming impacts. These phenomena are modeled here by a bifurcation of the solution for the velocity in the mechanical equilibrium equation for the deformable body
Berkane, Belaid. "Etudes expérimentales de l'influence de l'aératiοn sur les impacts hydrοdynamiques : deux cοnfiguratiοns idéalisées avec présence de pοches d'air et de bulles". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH04.
Texto completoHydrodynamic impacts between solid structures and liquids play a crucial role in various strategic fields such as coastal engineering, aeronautics, and renewable energy. This thesis focuses on the less explored effect of aeration, where the presence of air in the form of bubbles or air pockets significantly alters impact forces and hydrodynamic responses. The central objective of this thesis is to deepen our understanding of aeration's effects on complex hydrodynamic impact dynamics. This research concentrates on two distinct experimental setups: the impact of a flat plate on a calm water surface and the impact of an aerated water jet on a flat plate. The challenge is to examine how aeration influences impact pressures and post-impact oscillation frequencies. To achieve these objectives, experimental setups were designed for each case study. These model experiments allow us to precisely control crucial parameters such as impact velocity, plate dimensions, ambient pressure, etc. Special attention was also given to measuring aeration rates and impact pressures, enabling rigorous analysis of the results. For the plate impact, observations showed that maximum impact pressures and pressure impulses deviate from the von Karman theory, mainly due to the damping effect of air. Reducing ambient pressure increases impact pressures, suggesting a reduction of the air cushion effect. Regarding the impact of an aerated water jet, a diversity of flow regimes, such as bubble, slug, churn, and annular flows, were identified. The interaction between the number of injectors, air pressure, and bubble characteristics demonstrates a significant interdependence. The effects of aeration on impact pressures and oscillation frequencies show that larger structures induce slower oscillations and increased dimensionless pressures
Halbout, Séverin. "Contribution à l'étude des interactions fluide-structure lors de l'impact hydrodynamique avec vitesse d'avance d'un système de flottabilité d'hélicoptère". Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10036.
Texto completoWhen operating on offshore conditions, helicopters may encounteremergency situations during which an immediate sealanding isrequired. In this case, the aircraft may experience a water impact event.Floatability systems are inflated to cushion the impact and toensure that the floatation is maintained while the crew evacuates.The dimensioning procedure of helicopter's floatability systemsremains very challenging. In this process, accurate prediction of thebehavior and the global loads on the helicopters floaters during ditchingis crucial. To obtain a better understanding of the floatability system,and to be able to develop more accurate models, the hydrodynamicalcharacteristics of the floaters, as flexible bodies, need to be furtherinvestigated. Experiments assessing the hydrodynamics characteristicsof these particular types of deformable bodies are rare. To this aim, anexperimental campaign has been carried out to identify the nature ofloads (global and local) and potential deformations. Numericalinvestigations are proposed to complete our understanding ofphenomena observed during experimental tests.An academic experimental campaign have been led in the flume of Ecole Centrale de Marseille. A baloon was drop from 0.5 to 2.4m with various inner pressure. Deformations and kinematics are measured and analysed before comparisons with a semi-analytical modelisation. Some results with the in-house software DITCHER are also proposed in this thesys
Ghaleb, Marie-Josèphe. "Vibrations d'une plaque élastique infinie couplée avec un fluide sous l'effet d'un impact ponctuel". Grenoble 1, 1987. http://www.theses.fr/1987GRE10150.
Texto completoBeaudet, Julien. "Caractérisations à très hautes températures de protections thermiques sous impact normal d'un jet chaud supersonique : influence du couplage aérothermique et des propriétés matériaux sur la tenue à l'ablation". Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2011. http://www.theses.fr/2011ESMA0016.
Texto completoThis study is focused on the characterizations of the ablative properties of different thermal protections for very high temperatures applications. Using a specific characterization method, the physical mechanisms involved during the ablation process have been identified. Two different test benches with a normal gas flow have been used in this investigation. The first one is laboratory test bench based on an oxyacetylene torch (conditions termed "thermal ablation" with a 3000°C gas temperature). The second one is a large scale facility producing a hot supersonic gas flow (Mach number = 3) and a temperature about 2000°C, leading to an "aerothermal ablation". Various composite materials have been tested by mixing different matrices, different architectures and different kind of fibers. Under thermal ablation condition (oxyacetylene torch), mass loss and surface recession are due to the thermo-oxidation reactions occurring both in the matrix and in the fibers. Once the pyrolysis reaction completed, a volatilization of the composite during the exposure is observed. In contrast, under aerothermal ablation conditions, surface recession is observed prior to the completion of the oxidation/pyrolysis reactions. Under such conditions, the degradation of local mechanical properties associated with the strong mechanical impact of the supersonic jet on the material leads to ablation. In parallel, a numerical model of ablation has been developed. One of the main requirements was to develop an engineering tool to design various types of thermal protection systems (e. G. Organic composite, ceramic composites…) and hence various ablation processes. This model is based on the oxidation/pyrolysis reactions kinetics. It has been identified for one composite material whose thermal parameters (i. E. Thermal conductivity, specific heat, density) have been fully characterized as a function of temperature and degradation state. First numerical simulations were compared to the experimental results on the oxyacetylene torch test to validate the model for a future extension of ablation modelling under aerothermal conditions
Malleron, Nicolas. "Contribution à l'étude des interactions fluide-structure pour l'analyse de l'impact hydrodynamique d'un système de flottabilité d'hélicoptère". Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2009. http://tel.archives-ouvertes.fr/tel-00457018.
Texto completoCaleyron, Fabien. "Simulation numérique par la méthode SPH de fuites de fluide consécutives à la déchirure d'un réservoir sous impact". Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00711040.
Texto completoMessahel, Ramzi. "ALE and SPH formulations for Fluid Structure Interaction : shock waves impact". Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10022/document.
Texto completoThis thesis focuses on the numerical study of the propagation of shock waves in compressible multiphase flows and fluid structure interaction. Two approaches are being studied for the numerical solution of the fluid part: the ALE approach (Arbitrary Lagrangian Eulerian) and the Lagrangian SPH (Smoothed Particle Hydrodynamics) approach; while the structure part is solved by a conventional FE (Finite Element). The numerical investigation of the ALE and SPH methods are the two main areas of research.Water Hammers phenomena occuring in nuclear industries are investigated in this thesis. During a Water Hammer, the shock waves reflections in nuclear piping may drop locally the water pressure below its saturation pressure and generate cavitation. The three equations HEM (Homogeneous Equilibrium Model) phase change model proposed by Saurel et al. (1999) is studied and applied to solve water hammers. The obtained results are compared with experimental data. Despite the use of renormalization techniques in SPH, instabilities (numerical oscillations) are developed at the interface between particles from different materials. These instabilities restrict the use of traditional SPH schemes to problems with low density ratio. In order to solve the shock problems in the compressible regime, the scheme originally proposed by Hu and Adams (2006) is adapted to fully compressible regime (FC-SPH) by considering the coupling between the density and the smoothing length. The different SPH schemes are compared for 1-D and 2-D multiphase shock problems. Validation is performed in comparison with exact solutions for 1-D problems and ALE solution for 2-D problems
Thebault, Martin. "Coherent structures and impact of the external thermal stratification in a transitional natural convection vertical channel". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1327/document.
Texto completoIn natural convective flows, complex coherent structures develop whose the role in heat and mass transfer are not well understood. A numerical study, based on Large-Eddy-Simulations of a vertical channel with one side uniformly was therefore carried out. Different stages of transitional flow development were identified numerically with two characteristic frequency bands being observed in the flow, near the heated wall. Methods derived from the Proper Orthogonal Decomposition (POD) was also used and allows the most energetic modes to be separated accordingly to two characteristic frequency bands found numerically. As result, the contribution of the two families of modes to the near wall turbulent heat transfer and velocity-temperature correlation has been evaluated. POD was also performed on experimental measurements showing similarities with the numerically observed structures.In this work, variations of the external thermal stratification have been identified as one possible source of these differences and its influence was therefore investigated experimentally and numerically. It is shown that the increase in the positive gradient of the external stratification not only decreases the mass flow rate but also displaces the transition height to a lower location in the channel. Numerical simulations also allow the study of cases of weak and negative thermal stratifications which are difficult to achieve in laboratories. A theoretical model of the influence of the external thermal stratification on the mass flow rate was also developed. There is an excellent agreement between the theoretical predictions and the experimentally and numerically obtained mass flow rates. This clearly highlights that external temperature distributions are key driving factors and their influence is accurately quantified in this work
Capítulos de libros sobre el tema "Impact fluide-Structure"
PETITEAU, Jean-Christophe, Pierre BERTHELOT, Kevin BROCHARD y Alexis BLOC. "Tenue des structures composites sous chargements hydrodynamiques sévères". En Interactions fluide-structure, 343–71. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9078.ch11.
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