Дисертації з теми "Hydrodynamique des navires"
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Laurens, Jean-Marc. "Comportement hydrodynamique d'un gouvernail travaillant dans le sillage d'une hélice." Brest, 2002. http://www.theses.fr/2002BRES2015.
Повний текст джерелаIn order to determine the dimensions of the rudder, a reasonably accurate prediction of the hydrodynamic forces generated by this configuration should be made. Several methods were developed to simulate this interaction by coupling the potential code and the RANS code. The obtained results are in good agreement with available experimental results. Moreover, the computational speed allows a parametric analysis of the interaction (rudder position, propeller load, etc. ) to be carried out. Several configurations are simulated in the unsteady state mode in order to estimate the influence of geometric parameters on the hydrodynamic coefficients of a rudder operating in the propeller slipstream
Doutreleau, Yann. "Étude mathématique et numérique du problème de résistance de vagues." Palaiseau, École polytechnique, 1997. http://www.theses.fr/1997EPXX0004.
Повний текст джерелаBerton, Mikaël. "Analyse et optimisation numériques des performances de carènes élancées en mouvement instationnaire : application aux bateaux d'aviron." Nantes, 2007. http://www.theses.fr/2007NANT2136.
Повний текст джерелаThe work presented in this memoir deals with the modelization of the hydrodynamical loads acting on ship hull with unsteady surge, heave and pitch motions. This study focuses on competitive rowing boats and kayaks. In the first part, the Navier-Stokes code ICARE3D is used and validated with original towink tank experiments on a rowing boat with both steady and unsteady surge motions. The V&V (Verification and Validation) procedure is then applied with success. In the second part, the kriging and the design of experiments methodologies (DOE) are implemented and applied. The DOE is used in both qualitative and quantitative ways to determine the influent factors like frequency, amplitude, displacement or trim on the total drag coefficient. Both open sea and basin configurations are considered for the numerical simulations. At the end of this part, the complete rowing system obtained by coupling mechanics and hydrodynamics solvers is tested and and used in a DOE procedure. Finally, a set of tools implemented in this work that unable us to perform shape optimization is described. In order to reduce CPU time during optimization, stochastic algorithms are coupled with surrogate models. Two optimization examples are given in naval hydrodynamic
Liu, Ya Nan. "Effect of variable bathymetry on the linear anf slow-drift wave responses of floating bodies." Aix-Marseille 1, 2010. http://www.theses.fr/2010AIX11006.
Повний текст джерелаMarichal, Benoît. "Contribution numérique à l'étude de la manoeuvrabilité des corps élancés." Le Havre, 2001. http://www.theses.fr/2001LEHA0003.
Повний текст джерелаMaisondieu, Christophe. "L'Absorption dynamique des ondes de gravite en régime instationnaire." Nantes, 1993. http://www.theses.fr/1993NANT2025.
Повний текст джерелаLanfranchi, Jacques. "Études des résonances d'objets à symétrie cyclique : modes propres d'une hélice de navire." Le Havre, 1998. http://www.theses.fr/1998LEHA0015.
Повний текст джерелаTran, Khanh Toan. "Simulation de manœuvrabilité d’un navire, et identification des coefficients hydrodynamiques à partir des essais en mer." Compiègne, 2012. http://www.theses.fr/2012COMP2019.
Повний текст джерелаShip manoeuvring depends on two sets : (1) ship, propulsive system and hydrodynamic forces ; (2) influence of environmental perturbation forces (wind, current,. . ), of confined interaction (ship-bank/bottom, ship-ship,. . ) and parametric roll. The objectives of this PhD thesis focus firstly on ship manoeuvring modeling and simulation, then on preponderant hydrodynamic coefficient identification from sea trials, and finally on simulation and analysis of environmental perturbation influence and of roll
Gamrat, Gabriel. "Modélisation de l’hydrodynamique et des transferts de chaleur dans des microcanaux à parois rugueuses." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0092.
Повний текст джерелаThe objective of this thesis was to determine the effect of roughness on the flow and the heat transfers in microchannels. We carried out three-dimensional numerical simulations in order to characterize the interactions between the single-phase liquid flow and the rough elements. These calculations revealed that the flow in the rough near wall region can be modeled as two¬dimensional. Consequently, 2D numerical simulations were employed in order to determine the drag and heat transfer coefficients. These results were used in a one-dimensional model RLM (Rough Layer Model) based on the discrete elements method. The friction coefficient in a rough microchannel resulting from the RLM model was compared with the experimental results obtained for microchannels with roughness elements of controled form and distribution. This comparison showed a good agreement between the two approaches. This means that the influence of roughness in microchannels is not changed when compared to the influence observed in conventional size ducts. The analysis of the results showed that the influence of roughness depends on the local geometrical parameters (porosity and fractionation) when the relative height of the roughness elements «withlmodelmathlk/
Oger, Guillaume. "Aspects théoriques de la méthode SPH et applications à l'hydrodynamique à surface libre." Nantes, 2006. http://www.theses.fr/2006NANT2118.
Повний текст джерелаPalma, Valérie de. "Simulation et rendu de modèle de tenue de navire en mer ou les premières "marines" de synthèse." Paris 8, 1997. http://www.theses.fr/1997PA081392.
Повний текст джерелаThe objective of this thesis is to create the first synthesis "marines", that is to say representing a ship, or any other vehicles in relation with the water, in its environment but also simulating its behavior using ship motion model. This double task fits into an artistic continuity. It is the outcome of a slow and regular evolution, that has made of the first oar ship big sailing ship, and then powerfull machines of sea, that has always attracted and renewed the artist's inspiration. This research brings us to question ourselves on the place taken by the ship through the art, the role that perform the artist and the originality of his creation, to discover the qualities but also the shortcomings of ship representation in the art for the ship motion reproduction, to understand how to simulate and render the big ship motion on the sea by studying hydrodynamic, and to ask ourselves if the simulation developped for scientific purpose can adapt to artistic volonty. Because of the art compatibility with a controlled technic, and because artist knows how to take advantage of the development of technical meaning and computing, this research shows us see that the synthesis "marines" fits into an artistical continuity and that my approach is not so far from those of the marine painters; the computer simply takes the place of the brushes, the computer graphics the painting, and the theorical model took from the hydrodynamic, the experience of the sea
Huetz, Lionel. "Systematic study of the hydrodynamic behaviour of sailing yacht hulls using CFD and parametric design." Ecole centrale de Nantes, 2012. http://www.theses.fr/2012ECDN0020.
Повний текст джерелаUnlike most of engine powered ships, the performance of a sailing yacht cannot be predicted trough a sole hydrodynamic study. In fact, sailing yachts behaviour relies on the equilibrium between aerodynamic and hydrodynamic effects. A coupled modelling of those two elements is therefore required to characterize the yacht behaviour. A fully coupled simulation including the aerodynamic of the sails and topsides as well as the hydrodynamic of the wetted part of the hull is out of reach of current numerical tools. Velocity prediction programs remain essential. This type of program computes the equilibrium between aero and hydrodynamic forces to predict the yacht’s attitude and speed under given wind conditions. These forces are approximated using formulations, based on numerous results coming form experiments, simulations or empirical laws. The hydrodynamic models available nowadays for the design phase of the yacht are based on systematic series. Today’s hull shapes are far from the shapes used to build these series, leading to significant discrepancies between the predicted and the real performance of the yachts. After a detailed description of the existing formulations on the hydrodynamic behaviour of sailing yachts, this report presents a methodology to build new formulations. This method is based on new simulations results generated by an automated computational loop. The different tools used in the loop are described, from the generation of the hull shapes to their hydrodynamic evaluation using numerical simulation and the storage of the results in the database. A focus is made on the geometrical characterization of the hulls using hydrostatic computations. The methodology and the statistical tools used to build the formulations from the database are then described, with an emphasis on the variable selection process. Two systematic series are presented and analysed. The variables which have been selected as the most relevant to describe the physics involved are presented along with the formulations describing the forces and running attitudes of the hulls, depending on their shape and the external conditions. A benchmark of the presented formulations is finally provided. The case study of on an offshore racing monohull complying with the Volvo 70 rule is presented to evaluate the proposed methodology
Sigrist, Jean-François. "Modélisation et simulation numérique d'un problème couplé fluide/structure non linéaire : application au dimensionnement de structures nucléaires de propulsion navale." Nantes, 2004. http://www.theses.fr/2004NANT2088.
Повний текст джерелаConstantinescu, Adrian. "Modélisation 2D de l’impact d’une structure sur l’eau : initiation de l’endommagement." Brest, 2006. http://www.theses.fr/2006BRES2037.
Повний текст джерелаThe 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
Nontakaew, Udomkiat. "Etude théorique et expérimentale du problème de radiation d'ondes par une plaque plane en oscillations forcées avec vitesse d'avance." Poitiers, 1996. http://www.theses.fr/1996POIT2313.
Повний текст джерелаVonnet, Matthieu. "Modélisation dynamique et commande d'un propulseur naval." Phd thesis, Université de Nantes, 2008. http://tel.archives-ouvertes.fr/tel-00460439.
Повний текст джерелаNguyen, Manh-Hung. "Developpement d'une méthode de calcul de tenue à la mer avec effets portants par une méthode de singularité de Kelvin." Poitiers, 2007. http://www.theses.fr/2007POIT2239.
Повний текст джерелаRobert, Marie. "Modélisation numérique du comportement hydroélastique des navires sur houle non linéaire." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0047.
Повний текст джерелаThe increase of large ships dimensions shifts their structural natural frequencies towards common wave frequencies, inducing more interactions between the classic seakeeping response and the structural response. Accurate modeling of wavestructure interactions becomes a key issue for architects and classification societies during the design of a ship. In this respect, a new numerical tool for fluidstructure interaction is developed, combining a finite difference RANSE description of the fluid domain with ICARE-SWENSE and an analytic beam model, within a modal approach. Thanks to the use of a simple formulation for the structure part, the tool inherits ICARE-SWENSE tolerance properties with regard to large time steps, while still taking into account hydrodynamic nonlinear effects. Results presented for a flexible barge in diffraction and radiation according to flexible modes validate the first steps of the coupling procedure. Special consideration is given to hydrodynamic non linearities threshold and their impact on the structural response. A first implementation is shown for the resolution of the equation of motion for the elastic degrees of freedom. Parametric studies on ship resistance in both regular and bichromatic waves are included as a stepping stone towards future simulations of ship hydroelasticity in irregular waves
Ponizy, Barbara. "Calcul rapide de l'écoulement non symétrique autour de navires à l'aide de singularités de Kelvin ; application au cas des voiliers." Poitiers, 1996. http://www.theses.fr/1996POIT2300.
Повний текст джерелаTassin, Alan. "Modélisation tridimensionnelle d'impacts hydrodynamiques pour l'étude du tossage des bulbes d'étrave." Brest, 2010. http://www.theses.fr/2010BRES2029.
Повний текст джерелаThe present work deals with the modelling of water impacts in order to determine the hydrodynamic loads occurring during bulbous bow slamming. A three-dimensional model of water impact based on the Wagner theory has been developed. Such an approach is attractive, as it is accurate for blunt bodies and requires low computational resources. A new numerical method is proposed to solve the threedimensional Wagner problem by using the displacement potential approach and the Boundary Element Method. The hydrodynamic pressure is determined with the modified Logvinovich model. The proposed approach has been used to study several three-dimensional bodies. In addition, experimental tests have been carried out by using a hydraulic shock machine and CFD investigations have been made using a Finite Element software. A very good agreement between the three approaches has been observed. Furthermore, the efficiency of the proposed approach highlights the possibility of using it as a practical tool for preliminary design or optimization
Yang, Bo. "Numerical investigation of restricted curved waterways on ship hydrodynamics for maneuverability considerations." Electronic Thesis or Diss., Compiègne, 2023. http://www.theses.fr/2023COMP2735.
Повний текст джерелаInland waterway transport is now playing a significant role thanks to its various advantages over the other transportation modes, for example, low cost, low environmental pollution, and large capacity, etc. However, inland waterways are not only naturally curved but also narrow and shallow, which causes complex flow environments and navigational conditions. Inland ships are consequently susceptible to accidents in restricted curved waterways. Especially during these years, this mode of transport has seen significant progress by the arrival of the new generation of ships (larger size and more powerful), and this makes ships’ maneuverability in such sensitive waters severer. To conduct this investigation, the CFD model based on an unsteady Navier-Stokes solver in STARCCM+ is used. The verification and validation of this model are realized by respecting the ITTC recommendations. The latter is then used to perform a series of simulations by testing the following key parameters: a series of navigational environmental parameters, including channel angle, channel bottom width, channel slope angle; a set of parameters related to ship behaviors and geometry, containing water depth to draft ratio, ship speed, drift angle and ship type (ship length) on ship hydrodynamics in restricted curved fairways. Relative frame motions are applied to the computational domains to produce centrifugal force in bending fairways. The aim of the present thesis is firstly to characterize the variables connected to a circular channel's topology that have a substantial impact on a ship's maneuverability. Second, it helps to well understand the flow behaviors that occur around a ship in bending zones. Thirdly, the fluctuations in hydrodynamic force (bank cushion and suction phenomena) and the sensitivity of a number of variables in bending zones are investigated. Finally, the inland ship simulator is improved by adding the bending zone effect for pilots, so that the behaviors of ships in the sensitive regions can thus be corrected
Vuilmet, Cyrille. "Modélisation et commande d'une torpille pour la navigation autonome." Toulon, 2006. http://www.theses.fr/2006TOUL0022.
Повний текст джерелаThis thesis deals with the kinematic and dynamic modeling of underwater vehicles, in particular of the torpedo, and of the elaboration of a set of control laws for the autonomous navigation. After the determination of a theoretical dynamic model, and thanks to the hydrodynamic coefficients identification performed by the Bassin d'Essais des Carenes, we obtain a reliable model that is exploitable in simulation, so a specific simulator is elaborated. Then we find a solution to the autonomous navigation, suggesting a navigation strategy with piloting modes, and a control strategy based on the navigation decoupling, where the longitudinal velocity, the roll angle, and the horizontal and vertical dynamics are decoupled. From this base, the different piloting modes are designed with the sliding mode control techniques, which are reputed to be robust against the perturbations, and the parametric and structural uncertainties of the model. A first order sliding mode control is designed from a linear model but generates a chattering on the rudders (high frequency vibration). So we suggest limiting the chattering to design a second order sliding mode control from the nonlinear model of the vehicle, and for all piloting modes. A simplified torpedo mission, using all piloting modes is simulated, and emphasizes the robustness of this control law in presence of marine current, parametric variations of the hydrodynamic model and noise measurement
Cieutat, Jean-Marc. "Modélisation physiquement réaliste de session de simulation d'entraînement maritime." Bordeaux 1, 2003. http://www.theses.fr/2003BOR12771.
Повний текст джерелаMaritime training simulation is an important matter of maritime teaching which requires a lot of scientific and technical skills. In this framework, where the real time constraint has to be maintained, all physical phenomena cannot be studied; the most visual physical phenomena relating to the natural elements and the ship behaviour are reproduced only. Our swell model, based on a surface wave simulation approach, permits to simulate the shape and the propagation of a regular train of waves from the open sea to the shore taking into account current and depth effects. Our wind sea model is more restricted because it is based on a spectral simulation approach, but the obtained results are very representative of the sea states that are defined on the Beaufort's scale from 0 to 12 depending on the wind conditions; waves heights vary with current and sea depth. The choice of multi-grid data structure with a fixed scale, level of details display, bump-mapping of capillary waves permit to integrate all scales, from a millimetric wave amplitude to a whole golfe, inside a unique interactive animated tool. Relating to the lighting model, we use vertex and pixel shaders and an improved real-time computation of the underwater color is also proposed
Delacroix, Sylvain. "Caractérisation de la génération et de la propagation de bulles autour de la carène des navires scientifiques." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0014/document.
Повний текст джерелаOne of the main assignments of Ifremer is to study the seabed and the resources undersea, through a large oceanographic fleet used across the globe. For that purpose, ships are equipped with different kinds of SONAR (SOund Navigation And Ranging) to obtain the information sought in the water column. In some sea conditions, waves and ship motions generate significant air entrainment below the surface. Bubble clouds are then carried under the hull by the flow. The interaction between these bubbles and the acoustic waves may result in data loss, and therefore in a considerable reduction of the vessel’s productivity. The tools used to study this phenomenon are currently limited : the numerical models are not efficient enough to simulate at a time air entrainment at the bow and the two phase flow around the hull. On the other hand conventional towing tank tests are not entirely satisfactory. During this PhD research work, a specific test method to study this phenomenon has been developed and implemented at the Ifremer wave and current tank. This method requires the synchronization between a wave generator and a movement generator (hexapod) that enables to force the model motions, calculated in advance by numerical simulations. With this configuration, the effects of waves or motions characteristics on the bubbles generation can be studied independently. A complete instrumentation allowed to acquire images sequences to characterize the air entrainment at the bow of the model. Two distinct mechanisms have been observed : the generation of bubbles by vortex shedding or by the breaking bow wave. A post-processing method has been developed to analyse these mechanisms, for many test configurations. A parametric study was performed to calculate the frequency of bubbles generation for each test parameter. PIV measurements allowed to correlate the dynamic of bubbles clouds with the own flow dynamic. The overall results provide new elements for the understanding and the study of the phenomenon, with the final objective of obtaining a reliable tool that facilitates the design of research vessels
Raulo, Jacky. "Optimisation des sections de pales d'hélice." Rouen, 1997. http://www.theses.fr/1997ROUES022.
Повний текст джерелаDu, Peng. "Numerical modeling and prediction of ship maneuvering and hydrodynamics during inland waterway transport." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2459.
Повний текст джерелаIn this thesis, the ship hydrodynamics during inland waterway transport and ship maneuvering are investigated using CFD (Computational Fluid Dynamics) based onOpenFoam. Validation and verification studies are carried out for the mesh convergence, time step convergence, sensitivity to turbulence models and dynamic mesh techniques. A quaternion-based 6DoF motion solver is implemented for the trim and sinkage predictions. Environmental effects on several inland vessels (convoy 1, convoy 2, tanker) are studied using the validated numerical models. Three important aspects, the confinement effect of the waterway, head-on encounter and ship-bridge pile interaction are simulated. The testing conditions cover a wide range, including various channel dimensions, water depths, ship draughts and speeds. The ship resistance, wave pattern, Kelvin angle and wave elevation at specific positions are investigated as functions of these parameters. Ship maneuvering is investigated using virtual captive model tests based on the MMG (Mathematical Maneuvering Group) model. An actuator disk is implemented to replace the real propeller. Open water test, rudder force test, OTT (Oblique Towing Tank test) and CMT (Circular Motion Test) of a KVLCC2 model are carried out to obtain the hydrodynamic coefficients of the propeller, rudder and ship hull. Using the obtained coefficients, system-based maneuvering simulations are carried out and validated using the free running test data. These studies reproduce real ship tests and thus prove the validity of our numerical models. As a result, the numerical solver is promising in ship hydrodynamics and marine engineering simulations
Huang, Zhaoyuan. "Ship-waves modelling and their interactions with inland waterways." Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2686.
Повний текст джерелаThe subject of this thesis concerns the investigation of ship hydrodynamics, shipinduced wave modeling, and wave-bank interactions in restricted waterways by CFD approaches based on OpenFOAM. The first part of this thesis is focused on the study of the hydrodynamics of ships in a restricted environment. This consists of the characterization of the flow around the ship and the generation of waves according to the geometric and kinematic characteristics of the ship and also the geometric characteristics of the waterway channel. To this end, the steps of numerical modeling adapted to navigation in a confined environment, which concern the preference of meshgeneration, numerical schemes, etc., was developed. The second part is devoted (1) first to the validation and comparison of the numerical results with the experimental measurements from the laboratory of the CNR (Compagnie Nationale du Rhône) are carried out; (2) next to the examination of the ship’s forward resistance according to different geometric configurations of the waterway channel (width, water depth, slope, etc.) (3) finally, to the implementation of a six-degree-of-freedom model (6DoF) to assist in the modeling of the sinkage and trim processes of ships in restricted waterways. Meanwhile, the critical effects of ships under different speed conditions in restricted environments were also researched and analyzed. The third part of the thesis deals with the study of the influence of waves induced by ships on the banks of inland waterways and in particular on the stability of the bank protection blocks. The erosion effect caused by the impact and shear of ship-induced waves on the exposed river bank was studied. The armor protection layer on the river bank is composed of discrete blocks and these blocks are regarded as rigid bodies that can collide with each other and with the banks. Thus, in this part, a CFD-DEM solver, SediFoam, was applied to (1) take into account the solid-solid and solid-boundary of domain rigid contact and collision processes and (2) investigate the stability of the rocky layer of banks, based on the average of the movements of the blocks
Langlais, Clothilde. "Étude de la variabilité interannuelle des échanges côte-large : simulation haute résolution de la dynamique du Golfe du Lion." Toulon, 2007. http://www.theses.fr/2007TOUL0030.
Повний текст джерелаQuestions of global change entail elucidation of the processes that determine the exchanges between coastal ocean and deep sea. Fluxes across, ocean shelves are dominated by complex coastal dynamics and in the microtidal site of the Gulf of Lions, mixing and dispersion are dominated by interactions between coastal processes (freshwater dynamics associated to the Rhône river discharge, coastal upwellings, dense water formation and cascading) and the North Mediterranean shelf current. To know how these processes operate and interact, a regional model of the Gulf of Lions has been integrated over the 10 year period 1990-2000. The model is based on the NEMO code, with a 1/64" resolution and 130 vertical z-levels. Two main objectives can be underlined. The numerical outputs allow us to investigate the interanmial variability of the coastal circulation and fluxes across the shelf break and then to strike a balance, of the exchanges at the Gulf of Lion's margin over a quasi-climatic period. Coastal modelling and forecasting is a major challenge for the scientific community, and this study allow us to evaluate the modelling ability of the NEMO code in a coastal and microtidal application
Mottelet, Stéphane. "Quelques aspects théoriques et numériques du contrôle d'un bassin de carènes." Compiègne, 1994. http://www.theses.fr/1994COMPD770.
Повний текст джерелаDebaillon, Pierre. "Système de modélisation de l'enfoncement dynamique des bateaux." Compiègne, 2005. http://www.theses.fr/2005COMP1566.
Повний текст джерелаThe aim of the thesis is to present a tool to be able to calculate ship squat. It consists of an association of three numerical models in finite elements, reproducing the process of the phenomenon. A first model calculates the pressure field, function of the ship speed. Then a second model, with this pressure field, moves the vessel following a force and momentum result. The last model updates the mesh for a new cycle. The system is running as long as the equilibrium model moves the vessel
Morvan, Antoine. "Impact sur le pont mouillé d’un navire SWATH pour la maintenance des éoliennes offshore." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0003.
Повний текст джерелаThe aim of this PhD thesis is to develop simplified models about hydrodynamic impact (slamming) on the wet deck of a SWATH vessel for the maintenance of offshore wind turbines. The knowledge of the hydrodynamic loadings that the wet deck is subjected is an essential step in the design of the vessel’s bow. To realise this study we chose a parabolic twodimensional geometry which symbolises the wet deck and a regular Airy wave for the moving free surface. The models developed are based on the Wagner theory which provides relevant results for a low computational time. Two types of impact models have been developed. So-called asymptotic models, because they use a Taylor expansion of the wave profil and non-asymptotic models because they retain the whole shape of the wave. The pressure distributions on the parabolic shape are mainly calculated by the Modified Logvinovich Model (MLM). The results in terms of wetted corrections, pressure fields and hydrodynamic loadings are compared between the two types of models as a function of the wave radius of curvature We also determine the hydrodynamic impact arrangement which produces the highest hydrodynamic loadings by using reference configurations. For non-asymptotic models, the contribution of wave amplitude and phase velocity within hydrodynamic loadings is analysed in details. For non-asymptotic models, we made the study of the spatial and time variations of pressure fields computed with the linearized Bernoulli equation. We also compared the results of composite theory (COMP) to MLM theory and their consequences on hydrodynamic loadings. Finally, in order to get a basis of comparison for these regular Airy wave impact models, we implemented a numerical model using ABAQUS/CAE software. This model is based on a Coupled Eulerian-Lagrangian (CEL) coupling and show good matching with the results of non-asymptotic models in terms of relative errors. In a design office, all those results can be used to help design of the wet deck of a SWATH vessel
Jagite, George. "Analysis of Slamming Induced Whipping Effects over the Ultimate Strength of Ships." Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0018.
Повний текст джерелаThe first part of this thesis is dedicated to the numerical investigations of dynamic ultimate strength for various ship structures. In order to analyze the influence of the inertia and strain rate effects, different load functions are used, starting from the simplest ones where the loads are defined as half-sine functions, to more realistic ones where the loads are induced by equivalent design waves. The dynamic ultimate strength is defined as the maximum load level that leads to a non-collapse scenario, and it is determined through a newly developed iterative algorithm. Finally, the dynamic ultimate strength is compared with the quasi-static ultimate strength, and the dynamic load factors are derived in order to obtain a proper estimator of the dynamic collapse effect. The second part of the thesis is dedicated to the development of a new method to calculate the non-linear whipping response, where the elastoplastic structural response is considered. The hull girder is modeled as two non-uniform beams, connected with a non-linear hinge, described by the non-linear relation between the internal bending moment and the relative rotation angle. The hydrodynamic problem is solved using the 3D boundary element method. Then, the fully coupled hydro-elastoplastic problem is solved within a partly non-linear time-domain seakeeping program. The calculations are perfomed on a broad range of ships on different realistic loading scenarios Finally, the non-linear and linear whipping resposnes are compared in order to derive the dynamic ultimate capacity factors
Grinnaert, François. "Etude et implémentation des critères de seconde génération dans un code de stabilité." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0003/document.
Повний текст джерелаThe second generation intact stability criteria are currently under finalization by the International Maritime Organization. They are intended to improve the current intact stability rules by adding safety in waves. They are structured in five failure modes and three levels of assessment in each failure mode. The first level is based on a simplified deterministic approach of the phenomena and ensures high safety margins. The second level requires more complex computations based on hydrostatic considerations with regard to static waves and is expected to provide reduced safety margins. The third level, currently under development, would consist of numerical simulations of the ship’s behavior in real sea states performed by specialized institutes. Level-one and level-two criteria of both pure loss of stability and parametric roll failure modes have been implemented in a stability code. The KGmax curves associated with these future criteria are computed for a selection of different ships of different types, both civilian and military, expected or known to have different behaviors with regard to the considered failure modes. The requirement and the relevance of the criteria are analyzed. The second check of parametric roll level-two criterion is thoroughly analyzed. A simplified method providing the maximum parametric roll angle assuming a linear GZ is developed and implemented in the corresponding criterion
Caplier, Clément. "Étude expérimentale des effets de hauteur d'eau finie, de confinement latéral et de courant sur les sillages et la résistance à l'avancement des navires." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2315/document.
Повний текст джерелаThis thesis presents an experimental study of the effects of the waterway confinement and the current on ships wakes and drag. Two generic hulls representative of maritime and river ships have been studied in several bathymetric configurations in the towing tank of the Institut Pprime. Optical measurement methods based on a stereovision principle have been set up to measure the free surface deformations. The spatial extent and the resolution permits to lead a fine analysis of the wakes in the spectral space in order to decompose them into a hydrodynamic component and an undulatory component, respectively in the near-field and the far-field of the ship hull. The results obtained in a deep waterway configuration highlight the non-linearity of the ship wakes, which results in a modification of the shape of the envelop of the wave field in the real space. The results obtained in a shallow waterway configuration show a modification of the shape of the ship wakes and a different distribution of the energy between the wave systems. The influence of the shape and the speed of the ships on the amplitude of the hydrodynamic response and the return current is also identified. The comparison of the measurements in the presence of a counter-current with the results in calm water show an increase of the amplitude of the waves and an enlargement of the wash zone on the walls of the canal. Drag forces measurements with a multicomponent dynamometer give access to resistance curves for each configuration. The increase of the ship resistance in shallow water is put in parallel with the increase of the amplitude and the wavelength of the transverse waves
Ariffin, Arman. "Etude des critères de seconde génération de la stabilité du navire à l'état intact." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0043/document.
Повний текст джерелаThe Sub-Committee of Ship Design and Construction of International Maritime Organisation (IMO) has undertaken the development of Second Generation Intact Stability Criteria (SGISC). The GISC is an additional rule that complement present rules. Five failure modes will be address in SGISC are excessive roll in dead ship condition, pure loss of stability, broaching, parametric roll, and excessive acceleration. Moreover, these criteria are structured in three levels namely, first level, second level and direct assessment. Direct assessment procedures for every stability failure are developed with the most advanced state-of-the art technology available either by numerical analysis or experimental work for quantitative analysis. In this thesis, implementations of Level 1 and Level 2 of the SGISC in the hydrostatic solver, experimental approached for dead ship condition and RANS simulation are presented.In conclusion, it was possible to implement the stability criteria of the intact second-generation vessel in the GHS © code of stability, a code commonly used by industrialists in the field. Five vessels were considered to verify this implementation. An experimental wind tunnel method and a simplified CFD calculation method were used on two different models. In both cases, the results show that the maximum roll angle reached by the two vessels studied is lower than the one given by the regulatory calculation. The experimental method is certainly closer to reality and the calculation CFD remains conservative without being as binding as the regulation.Therefore, the two approaches, numerical and experimental can be proposed to be used for Direct Assessment of the criterion
Raymond, Jérémie. "Estimation des performances des voiliers au planing." Ecole Centrale de Nantes, 2009. http://www.theses.fr/2009ECDN0013.
Повний текст джерелаRipoll, Jean-François. "Modélisation mathématique et numérique du couplage hydrodynamique-transfert radiatif : application aux feux." Bordeaux 1, 2001. http://www.theses.fr/2001BOR10504.
Повний текст джерелаPolitis, Konstantinos. "Développement de modèles numériques de tension superficielle pour la simulation d'écoulements avec interface à l'aide d'une formulation multi-fluides." Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0021.
Повний текст джерелаAir Lubrication methods are regarded by the scientific community as the next major technological breakthrough in Naval Engineering to achieve the reduction of drag in commercial vessels. The accurate modeling of the physical phenomena governing the drag reduction mechanisms of Air Lubrication methods, namely, the dynamics of surface tension, the instabilities of the air-water interfaces and air entrainment, are imperative for the design of air-lubricated hulls. To that end, we have implemented to ISIS-CFD several programming tools, interface reconstruction schemes and surface tension modeling. Two new surface tension methods were developed. Both use a global interface reconstruction scheme and are coupled with the compressive discretization volume fraction schemes for the unstructured finite volume formulation that the flow solver ISIS-CFD is based on. The results demonstrate that complicated dynamic interactions of either a single or multiple interfaces can be accurately captured. In the context of a future research study, the proposed approaches could lead to the further enhancement of the modeling capabilities of ISISCFD by introducing a macroscopic air entrainment model and eventually the assessment of different physical effects encountered in lubricated naval vessels using ISIS-CFD
Tayachi, Manel. "Couplage de modèles de dimensions hétérogènes et application en hydrodynamique." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM031/document.
Повний текст джерелаThe work presented here focuses on electrodes made of silicon, a promising material to replace graphite as an anode active material for Li-ion Batteries (LIBs). The first part of the manuscript is dedicated to the study of silicon (de)lithiation mechanisms by Auger Electron Spectroscopy (AES). By using this technique of surface characterization, which allows investigating individual particles in their electrode environment, our results show that the first silicon lithiation occurs through a two-phase region mechanism cr-Si / a-Li3,1Si, whereas the following (de)lithiation steps are solid solution type process. Upon (de)alloying with lithium, silicon particles undergo huge volume variations leading to a quick capacity fading. By combining several techniques of characterization, the failure mechanisms of a silicon electrode are studied during aging. In particular, by using electrochemical impedance spectroscopy and mercury porosimetry analyses, an impressive dynamic upon cycling of the electrode porosity is shown. A model, which mainly attributes the capacity fading to the Solid Electrolyte Interphase instability at the silicon particles surface, is proposed. To try to stabilize this passivation layer and thus improve silicon electrodes electrochemical performances, the influence of two parameters is studied: the electrolyte and the “lithiation domain” of silicon; the latter is associated with the evolution of the active material composition upon cycling. Finally, by using these last results, promising performances are obtained for silicon electrode containing LIBs
Guyot, Florent. "Etude expérimentale de la résistance ajoutée d'une maquette de navire soumise à des oscillations forcées harmoniques : étude du champ de vagues instationnaire associé." Poitiers, 1995. http://www.theses.fr/1995POIT2286.
Повний текст джерелаAllali, Karam. "Analyse et simulation numérique des problèmes de réaction-diffusion avec hydrodynamique." Lyon 1, 2000. http://www.theses.fr/2000LYO10118.
Повний текст джерелаPrioux, Nicolas. "Méthodes d'analyse harmonique pour l'étude des équations de Navier-Stokes, de Boussinesq et de la Magnéto-Hydrodynamique." Marne-la-Vallée, 2007. http://www.theses.fr/2007MARN0354.
Повний текст джерелаThis thesis is devoted to the study of some partial differential equations arising in fluid dynamics, such as the Navier-Stokes (NS), Boussinesq and magneto-hydrodynamic (MHD) equations. Using harmonic analysis tools, we obtain some existence, uniqueness and asymptotic stability of solutions from an abstract model of PDE’s for small data. Then, we apply these results to the case of Boussinesq and MHD equations. For NS we also obtain a link between mollified Leray solutions and Kato mild ones with initial data in bmo−1, as well as the behavior in 1/pt for a class of local in time solutions. Finally, we generalise some well known results for NS to the MHD equations (Leray-Hopf solutions, Serrin’s regularity result, mild solutions in Besov spaces)
Boin, Jean-Philippe. "Calcul des efforts hydrodynamiques sur un navire soumis à une houle régulière : applications d'une méthode de singularité de Kelvin." Poitiers, 2001. http://www.theses.fr/2001POIT2318.
Повний текст джерелаFrey, Jean-Michel. "Interactions hydrodynamiques entre particule et paroi en écoulement de Stokes : application à la filtration." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT049H.
Повний текст джерелаGhalya, Nejiba. "Interactions hydrodynamiques entre une particule solide et une paroi plane avec condition de glissement de Navier." Phd thesis, Ecole Polytechnique X, 2012. http://pastel.archives-ouvertes.fr/pastel-00767656.
Повний текст джерелаGrosset, Océane. "Identification de la pression pariétale turbulente par problème inverse vibratoire dans les domaines aéronautique et naval." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1036/document.
Повний текст джерелаThe study of aeroacoustic and hydroacoustic noises is an important industrial research field. For example, in the transport industry, flows induced by a fluid over a structure, create a source of internal noise which cannot be neglected. To minimize its impact, it is necessary to have a good knowledge of this kind of excitation.The aim of this study is to identify the turbulent wall pressure which excites the structure, for the aeronautic and naval domains, by using an inverse vibration method, such as FAT (Force Analysis Technique) and its variations FWFAT (Filtered Windowed Force Analysis Technique) and CFAT (Corrected Force Analysis Technique).First, the methods are applied to the aeronautic domain. The influence of the flow velocity on the acoustic field and the difficulty to identify the pressure responsible for the structure vibration are pointed out.Second, an application to the naval domain is shown. The method ability to isolate the acoustic part of the excitation is introduced by using simulations. The significance of the fluid-structure coupling is studied and a method which allows taking it into account is proposed. The potentiality of CFAT method is confirmed with an experimental validation at DGA Techniques Hydrodynamiques
Maerten, Patrick. "Schéma numérique pour la modélisation des écoulements instationnaires incompressibles : application à quelques cas d'instabilités hydrodynamiques." Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-190.pdf.
Повний текст джерелаChegroun, Nouara. "Etude numérique des actions hydrodynamiques sur une sphère en translation et rotation dans la gamme des nombres de Reynolds inferieurs à 50." Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL122N.
Повний текст джерелаVittoz, Louis. "Contributions au développement d’un solveur volumes finis sur grille cartésienne localement raffinée en vue d’application à l’hydrodynamique navale." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0020/document.
Повний текст джерелаAn original strategy to address hydrodynamic flow was recently proposed through a high-order weakly-compressible Cartesian grid approach. The method is based on a fully-explicit temporal scheme for solving the Navier-Stokes equations. The present thesis aims to reduce the computational time required to obtain the results without deteriorating the accuracy.A first part is dedicated to the implementation of a truly incompressible formulation with an implicit solution for the pressure field through a projection scheme. The incompressible solver allows larger time step size for time integration since the speed of sound tends to infinity. In return the algorithms are no longer straight forward and a linear system has to be solved through the Pressure Poisson Equation. Comparisons carried out between both formulations show that the projection scheme can be better adapted to efficiently simulate unsteady viscous flows. Then an improvement of the immersed boundary method has been proposed. Results are not fully satisfactory for now. However, it seems easier to develop a numerical scheme for the incompressible approach rather than the weakly-compressible one.Finally, the last part addresses the setup up of complex triangulations in immersed boundary simulations. A fast and robust procedure is developed for distance computation with an octree data structure
Boulanger, Anne-Céline. "Modélisation, simulation et assimilation de données autour d'un problème de couplage hydrodynamique-biologie." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00871141.
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