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Dissertations / Theses on the topic 'Wave-structure interaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Cadby, Jonathan R. "Wave/structure interaction in two-layer fluids." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/7554.

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2

Siddorn, Philip David. "Efficient numerical modelling of wave-structure interaction." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:de36bd2f-cd23-4f11-b67f-9d8cd48ecd3c.

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Offshore structures are required to survive in extreme wave environments. Historically, the design of these offshore structures and vessels has relied on wave-tank experiments and linear theory. Today, with advances in computing power, it is becoming feasible to supplement these methods of analysis with fully nonlinear numerical simulation. This thesis is concerned with the development of an efficient method to perform this numerical modelling, in the context of potential flow theory. The interaction of a steep ocean wave with a floating body involves a moving free surface and a wide range of

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3

Roos, Jannicke Sara Martina. "Wave-structure interaction : the effective prediction of wave-in-deck loads." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7109.

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The safe and efficient design of many offshore structures is critically dependent on the accurate prediction of the applied wave loads. In analysing these loads, the contribution arising at or close to the instantaneous water surface is particularly significant. The reasons for this relate to moment arm effects leading to large contributions to the total overturning moment, to the uncertainty in the predicted kinematics and hence the applied loads and, perhaps most significantly, to the occurrence of wave-in-deck loads. The imposition of ever more stringent design conditions implies that the p

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4

Raosa, Andrea Natalia <1985&gt. "Analysis and mathematical modeling of wave-structure interaction." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6626/1/raosa_andrea_natalia_tesi.pdf.

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The aim of this thesis, included within the THESEUS project, is the development of a mathematical model 2DV two-phase, based on the existing code IH-2VOF developed by the University of Cantabria, able to represent together the overtopping phenomenon and the sediment transport. Several numerical simulations were carried out in order to analyze the flow characteristics on a dike crest. The results show that the seaward/landward slope does not affect the evolution of the flow depth and velocity over the dike crest whereas the most important parameter is the relative submergence. Wave heights dec

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5

Raosa, Andrea Natalia <1985&gt. "Analysis and mathematical modeling of wave-structure interaction." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6626/.

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The aim of this thesis, included within the THESEUS project, is the development of a mathematical model 2DV two-phase, based on the existing code IH-2VOF developed by the University of Cantabria, able to represent together the overtopping phenomenon and the sediment transport. Several numerical simulations were carried out in order to analyze the flow characteristics on a dike crest. The results show that the seaward/landward slope does not affect the evolution of the flow depth and velocity over the dike crest whereas the most important parameter is the relative submergence. Wave heights dec

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6

Li, Linghan. "Numerical investigation of wave structure interaction with application to wave energy devices." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/413590/.

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Wave energy has become one of the most promising energy resources and hence has attracted more attention from the governments and energy companies. In order to meet the growing demands on global energy, the next generation of energy extracting device needs to be more efficient with less operation cost, and as an offshore structure, the survivability also needs to be taken into consideration. Therefore, it is vital that the hydrodynamic behaviour of the energy device can be predicted accurately at the initial design stage. In this research, the wave structure interaction with application to wav

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7

Christou, Marios. "Fully nonlinear computations of waves and wave-structure interaction." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5488.

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This thesis concerns the development of an exact or fully nonlinear numerical model capable of describing surface water waves, including the occurrence of wave breaking, and their interaction with structures. The motivation for this work arose, first because of an inability to model limiting and overturning waves in directionally-spread seas and, second because of an inability to describe some of the highly nonlinear free-surface effects which arise when steep waves interact with surface-piercing columns. On both counts the available design tools were known to fall well short of accurately des

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8

Formentin, Sara Mizar <1987&gt. "Neural network modelling of the wave-structure interaction processes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7001/1/formentin_saramizar_tesi.pdf.

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This thesis presents a new Artificial Neural Network (ANN) able to predict at once the main parameters representative of the wave-structure interaction processes, i.e. the wave overtopping discharge, the wave transmission coefficient and the wave reflection coefficient. The new ANN has been specifically developed in order to provide managers and scientists with a tool that can be efficiently used for design purposes. The development of this ANN started with the preparation of a new extended and homogeneous database that collects all the available tests reporting at least one of the three para

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9

Formentin, Sara Mizar <1987&gt. "Neural network modelling of the wave-structure interaction processes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7001/.

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This thesis presents a new Artificial Neural Network (ANN) able to predict at once the main parameters representative of the wave-structure interaction processes, i.e. the wave overtopping discharge, the wave transmission coefficient and the wave reflection coefficient. The new ANN has been specifically developed in order to provide managers and scientists with a tool that can be efficiently used for design purposes. The development of this ANN started with the preparation of a new extended and homogeneous database that collects all the available tests reporting at least one of the three para

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10

Lehmann, Lutz. "Wave propagation in infinite domains : with applications to structure interaction /." Berlin [u.a.] : Springer, 2007. http://www.gbv.de/dms/bs/toc/523903820.pdf.

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11

Li, Zhaobin. "Two-phase spectral wave explicit Navier-Stokes equations method for wave-structure interactions." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0041/document.

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Cette thèse propose un algorithme efficace pour la simulation numérique des interactions houle-structure avec des solveurs CFD bi-phasiques. L'algorithme est basé sur le couplage de la théorie potentielle et des équations bi-phasiques de Navier-Stokes. C'est une extension de la méthode Spectral Wave Explicit Navier-Stokes Equations (SWENSE) pour les solveurs CFD bi-phasiques avec une technique de capture d'interface. Dans cet algorithme, la solution totale est décomposée en une composante incidente et une composante complémentaire. La partie incidente est explicitement obtenue avec des méthode

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12

Morgan, Gerald C. J. "Application of the interfoam VoF code to coastal wave/structure interaction." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589650.

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The validation of the “interFoam” CFD model (part of the OpenFOAM) CFD library is described for a number of wave/structure interaction problems. The background to the research is described, including the reasons for the selection of a new, previously unvalidated CFD code for this purpose. The numerical aspects of the code are briefly reviewed as are some of its additional features including the simulation of porous media. The new wave-generating boundary condition, created as part of this project, is described. The model is validated for the propagation of waves, including violent, breaking wa

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13

Kosleck, Sascha [Verfasser], and Günther F. [Akademischer Betreuer] Clauss. "Prediction of Wave-Structure Interaction by Advanced Wave Field Forecast / Sascha Kosleck. Betreuer: Günther F. Clauss." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2013. http://d-nb.info/103231303X/34.

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14

Kosleck, Sascha Verfasser], and Günther [Akademischer Betreuer] [Clauss. "Prediction of Wave-Structure Interaction by Advanced Wave Field Forecast / Sascha Kosleck. Betreuer: Günther F. Clauss." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2013. http://d-nb.info/103231303X/34.

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15

Mai, Trí Cao. "On the role of aeration, elasticity and wave-structure interaction on hydrodynamic impact loading." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9884.

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Local and global loadings, which may cause the local damage and/or global failure and collapse of offshore structures and ships, are experimentally investigated in this study. The big research question is how the aeration of water and the elasticity of the structural section affect loading during severe environmental conditions. A further question is how the scattered waves from ships and offshore structures, the mooring line force and the structural response, which are known to affect local load and contribute to global load, will be affected by wave-structure interaction of a ship or offshor

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16

Nové-Josserand, Clotilde. "Converting wave energy from fluid-elasticity interactions." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC124/document.

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Le développement des systèmes houlomoteurs ainsi que la gestion du littoral reposent sur une bonne compréhension des mécanismes liés aux interactions houle-structure. Dans cette thèse, nous nous intéressons à l'étude d'un champ de structures flexibles soumises à des ondes de surface, en vue de développer un système qui puisse à la fois atténuer les vagues et absorber l'énergie qui leur est associée de manière efficace. Les résultats présentés se basent autour d'expériences réalisées dans des installations de petite échelle, dans lesquelles la disposition spatiale des objets flexibles est le pr

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17

Baker, Scott. "Physical and numerical modelling of wave interaction with a three-dimensional submerged structure." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27954.

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Submerged structures are frequently used in coastal engineering applications, such as tunnel and pipeline protection works, breakwaters, and artificial reefs. Although a significant number of research works have focused on low-crested structures, there is far less research into deeply submerged structures. In most research, lightly-sloped, uniform cross-sectioned submerged structures with specific crest elevations are considered. The present thesis deals with the three-dimensional physical and numerical modelling of the interaction of irregular waves with a large-scale three-dimensional submer

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18

Chen, Qiang. "Development of a full particle PIC method for simulating nonlinear wave-structure interaction." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760902.

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During the past few decades, Computational Fluid Dynamics (CFD) modelling hasbecome very popular in the coastal and offshore engineering community. Both Eulerianand Lagrangian methods have achieved great successes; typical examples are thegrid-based OpenFOAM® model and the meshless Smoothed Particle Hydrodynamics(SPH) method based model (e.g. SPHysics). While the former tends to be moreefficient and has advantages in enforcing incompressibility and boundary conditionsvia use of a grid, the latter is more suitable for handling large free-surface deformationsusing particles. In an attempt to com

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19

Li, Miao. "Three-Dimensional Wave-Structure Interaction Modelling Using the Scaled Boundary Finite Element method." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/367469.

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In ocean engineering, the subject of wave-structure interaction has been the focus of heated debate for decades. Ocean engineers investigate wave behaviour in the presence of man-made structures, whilst structural engineers utilise accessible wave parameters to evaluate structural response. However, these two processes are closely related to each other, and difficulties exist if explicit wave forces are not available for structural analysis. Furthermore, differences in the theoretical background between wave and structural analyses pose additional challenges. Taking into consideration all thes

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20

Costanzo, Anthony. "Experimental Investigation of Shock Wave-Boundary Layer Interaction on a Generic Oscillating Bump." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156059.

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The presented research investigates the effects of shock wave boundary layer interaction on the unsteady pressure response of the surface of an oscillating structure. A simplified structure, a 2D prismatic bump, located in a straight channel is used to better understand the bending flutter phenomenon. Time-resolved measurements of the unsteady surface pressures and the instantaneous model geometry measurements are performed in order to study the effect of the shock wave on the aerodynamic load acting over the flexible generic bump. The bump is oscillated in a controlled manner with amplitude o

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21

Wu, Xiong-Jian. "Motion and wave load analyses of large offshore structures and special vessels in waves." Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/7865.

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Predictions of the environmental loading and induced motional and structural responses are among the most important aspects in the overall design process of offshore structures and ships. In this thesis, attention is focused on the wave loads and excited bodily motion responses of large offshore structures and special vessels. With the aim of improving the existing theoretical methods to provide techniques of theoretical effectiveness, computational efficiency, and engineering practicality in marine and offshore applications, the thesis concentrates upon describing fundamental and essential as

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22

Elsafti, Hisham [Verfasser], and H. [Akademischer Betreuer] Oumeraci. "Modelling and Analysis of Wave-Structure-Foundation Interaction for Monolithic Breakwaters / Hisham Elsafti ; Betreuer: H. Oumeraci." Braunschweig : Technische Universität Braunschweig, 2015. http://d-nb.info/117581959X/34.

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23

Chun, Sangeon. "Nonlinear Fluid-Structure Interaction in a Flexible Shelter under Blast Loading." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29849.

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Recently, numerous flexible structures have been employed in various fields of industry. Loading conditions sustained by these flexible structures are often not described well enough for engineering analyses even though these conditions are important. Here, a flexible tent with an interior Collective Protection System, which is subjected to an explosion, is analyzed. The tent protects personnel from biological and chemical agents with a pressurized liner inside the tent as an environmental barrier. Field tests showed unexpected damage to the liner, and most of the damage occurred on tent's

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24

Douglas, Steven. "Numerical Modeling of Extreme Hydrodynamic Loading and Pneumatic Long Wave Generation: Application of a Multiphase Fluid Model." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/34076.

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In this study, a three-dimensional two-phase (air and water) numerical solver is applied to investigate free surface flows. The first component aims to improve the overall understanding of the underlying physical mechanisms that occur during the interaction between turbulent hydraulic bores and simple structures. Data collected during large-scale physical experiments based on generating dam-break waves in a horizontal rectangular channel is used for comparing to the numerical results. An extensive sensitivity analysis on numerical parameters including spatial discretization and turbulence mode

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25

Martin-Medina, Manuel. "Tsunami wave interaction with a coastal structure: : Focus on the Tohoku tsunami case and the flip-through impact." Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3047/document.

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Lors du tsunami de Tohoku en 2011, des relevés de terrain sur les côtes japonaises ont montré la fragilité des structures côtières, où le plus grand brise-lames du monde (brise-lames de Kamaishi) a été fortement endommagé dû à cet événement. Dans ce doctorat, l'objectif est d'étudier l'interaction entre les brise-lames , les structures côtières les plus communes protégeant les zones urbaines et les entrées des ports, et les vagues, en particulier les tsunamis.Dans la première partie de ce travail, la transformation du tsunami en bore ondulaire dans les zones côtières est étudiée numériquement

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26

Fares, Reine. "Techniques de modélisation pour la conception des bâtiments parasismiques en tenant compte de l’interaction sol-structure." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4103/document.

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La conception des bâtiments selon le code sismique européen ne prend pas en compte les effets de l'interaction sol-structure (ISS). L'objectif de cette recherche est de proposer une technique de modélisation pour prendre en compte l’ISS et l'interaction structure-sol-structure (ISSS). L'approche de propagation unidirectionnelle d’une onde à trois composantes (1D-3C) est adoptée pour résoudre la réponse dynamique du sol. La technique de modélisation de propagation unidirectionnelle d'une onde à trois composantes est étendue pour des analyses d'ISS et ISSS. Un sol tridimensionnel (3D) est modéli

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27

Ebna, Hai Bhuiyan Shameem Mahmood [Verfasser]. "Finite Element Approximation of Ultrasonic Wave Propagation under Fluid-Structure Interaction for Structural Health Monitoring Systems / Bhuiyan Shameem Mahmood Ebna Hai." Hamburg : Helmut-Schmidt-Universität, Bibliothek, 2017. http://d-nb.info/1148436170/34.

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28

Aliyar, Sithik. "Extreme wave interaction with fixed and floating structures using hybrid coupling approach." Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0047.

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La thèse vise à étudier l’efficacité et la précision des solveurs NS et SWENSE pour simuler des structures fixes et flottantes. Les deux solveurs sont basés sur OpenFOAM et sont couplés indépendamment avec HOS pour la générationd’onde en termes de domaine et d’approche de décomposition fonctionnelle. Les solveurs sont testés pour trois applications. Les première et deuxième applications présentent l’interaction d’ondes de focalisation avec des cylindresfixes et mobiles et la troisième est l’interaction d’ondes régulières et irrégulières avec la sousstructure de type OC3 Hywind SPAR. Les méthod

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29

Singh, Reetu. "Development of Three Dimensional Fluid-Structure Interaction Models for the Design of Surface Acoustic Wave Devices: Application to Biosensing and Microfluidic Actuation." Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/3677.

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Surface acoustic wave (SAW) devices find uses in a plethora of applications including but not limited to chemical, biological sensing, and microfluidic actuation. The primary aim of this dissertation is to develop a SAW biosensor, capable of simultaneous detection of target biomarkers in fluid media at concentrations of picogram/ml to nanogram/ml levels and removal of non-specific proteins from sensor surface using the process of acoustic streaming, for potential chemical sensing, medical, and clinical diagnostic applications. The focus is on the development of three dimensional finite element

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30

Chandra, Johanes. "Analyses expérimentales de la réponse sismique non-linéaire du système sol-structure." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU023/document.

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La concentration de plus en plus importante de la population dans les milieux urbains exposés à une forte sismicité peut générer de plus en plus de dommages et de pertes. La réponse sismique en milieu urbain dépend des effets du site (direct amplification et non-linéarité du sol) et du couplage entre le sol et les structures (interaction sol-structure et site-ville). Par conséquent, la compréhension de la sismologie urbaine, c'est-à-dire le mouvement du sol intégrant l'environnement urbain, est critique pour réduire les dommages. Cela passe par la prédiction du mouvement du sol dans le milieu

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31

Deborde, Julien. "Modélisation et simulation de l’interaction fluide-structure élastique : application à l’atténuation des vagues." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0606/document.

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Une méthode complètement Eulérienne reposant sur un modèle 1-fluide est présentée afinde résoudre les problèmes d’interaction fluide-structure élastique. L’interface entre le fluideet la structure élastique est représentée par une fonction level-set, transportée par le champde vitesse du fluide et résolue par un schéma d’ordre élevé WENO 5. Les déformationsélastiques sont calculées sur la grille eulérienne à l’aide des caractéristiques rétrogrades.Nous utilisons différents modèles d’hyperélasticité, afin de générer puis d’intégrer les forcesélastiques comme terme source des équations de Navier

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32

PERUZZI, COSIMO. "Turbulence Properties of Smooth-Bed Open-Channel Flows with and without Collinear Gravity Waves." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2845794.

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33

Lu, Zhaokuan. "Computationally-effective Modeling of Far-field Underwater Explosion for Early-stage Surface Ship Design." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/104996.

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The vulnerability of a ship to the impact of underwater explosions (UNDEX) and how to incorporate this factor into early-stage ship design is an important aspect in the ship survivability study. In this dissertation, attention is focused on the cost-efficient simulation of the ship response to a far-field UNDEX which involves fluid shock waves, cavitation, and fluid-structural interaction. Traditional fluid numerical simulation approaches using the Finite Element Method to track wave propagation and cavitation requires a high-level of mesh refinement to prevent numerical dispersion from discon

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34

Martinásek, Josef. "DYNAMICKÁ ANALÝZA ZÁKLADOVÉ KONSTRUKCE V INTERAKCI S PODZÁKLADÍM." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-390246.

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Thesis deals with problems of the soil-structure interaction. In the theoretical part is described the approach to mathematical modeling of structure-foundation-soil interaction. The subsoil models are further described in detail, including the models with piles (both static and dynamics models). In the next chapter there is described the dynamics theory of the systems with single or more degrees of freedom. There is also an analysis of propagation, reflection and refraction of mechanical one-dimensional waves (P-wave, S-wave) and spatial waves (P- wave, SV-wave, SH-wave) and waves in homogene

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35

Abdolmaleki, Kourosh. "Modelling of wave impact on offshore structures." University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0055.

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[Truncated abstract] The hydrodynamics of wave impact on offshore structures is not well understood. Wave impacts often involve large deformations of water free-surface. Therefore, a wave impact problem is usually combined with a free-surface problem. The complexity is expanded when the body exposed to a wave impact is allowed to move. The nonlinear interactions between a moving body and fluid is a complicated process that has been a dilemma in the engineering design of offshore and coastal structures for a long time. This thesis used experimental and numerical means to develop further underst

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Cao, Shunxiang. "Numerical Methods for Fluid-Solid Coupled Simulations: Robin Interface Conditions and Shock-Dominated Applications." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93514.

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This dissertation investigates the development of numerical algorithms for coupling computational fluid dynamics (CFD) and computational solid dynamics (CSD) solvers, and the use of these solvers for simulating fluid-solid interaction (FSI) problems involving large deformation, shock waves, and multiphase flow. The dissertation consists of two parts. The first part investigates the use of Robin interface conditions to resolve the well-known numerical added-mass instability, which affects partitioned coupling procedures for solving problems with incompressible flow and strong added-mass effect.

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37

Bhuddi, Ajit. "Approche ondulatoire pour la description numérique du comportement vibroacoustique large bande des conduites avec fluide interne." Thesis, Tours, 2015. http://www.theses.fr/2015TOUR4046/document.

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Dans ce travail, une méthode basée sur les éléments finis ondulatoires - Wave Finite Elements (WFE) - est proposée en vue de prédire le rayonnement acoustique de conduites axisyrnétriques de longueur finie, comportant un fluide interne, et immergées dans un fluide acoustique de dimensions infinies. La condition de rayonnement de Sommerfeld est prise en compte en entourant le fluide extérieur d'un perfectly matched layer (PML), c'est-à-dire une couche d'éléments absorbants dans laquelle les ondes acoustiques incidentes sont progressivement amorties. Dans le cadre de l'approche WFE, la conduite,

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38

Kowalczyk, Piotr Jozef. "Validation and application of advanced soil constitutive models in numerical modelling of soil and soil-structure interaction under seismic loading." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/275675.

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This thesis presents validation and application of advanced soil constitutive models in cases of seismic loading conditions. Firstly, results of three advanced soil constitutive models are compared with examples of shear stack experimental data for free field response in dry sand for shear and compression wave propagation. Higher harmonic generation in acceleration records, observed in experimental works, is shown to be possibly the result of soil nonlinearity and fast elastic unloading waves. This finding is shown to have high importance on structural response, real earthquake records and r

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Kowalczyk, Piotr Jozef. "Validation and application of advanced soil constitutive models in numerical modelling of soil and soil-structure interaction under seismic loading." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/275675.

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This thesis presents validation and application of advanced soil constitutive models in cases of seismic loading conditions. Firstly, results of three advanced soil constitutive models are compared with examples of shear stack experimental data for free field response in dry sand for shear and compression wave propagation. Higher harmonic generation in acceleration records, observed in experimental works, is shown to be possibly the result of soil nonlinearity and fast elastic unloading waves. This finding is shown to have high importance on structural response, real earthquake records and re

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40

Biamino, Laurent. "Etude expérimentale de l'interaction d'une onde de choc avec une structure mobile autour d'un axe." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10093/document.

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Ce travail de thèse s’appuie sur une étude expérimentale en tube à choc, plus précisément, c’est une approche expérimentale de l'étude de l'interaction fluide-structure. Considérons un solide indéformable auquel on laisse un degré de liberté en rotation autour d'un axe. Cette structure ferme un espace clos. Si le contenu de l'espace clos subit le passage d'une onde de choc, ce solide va être mis mouvement et tourner autour de son axe. Concrètement, l'onde de choc va augmenter les caractéristiques physiques, en particulier sa pression, du fluide en contact avec la face impactée de cette porte.

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41

ROCCHI, STEFANIA. "Nonlinear Transformation of Waves over a submerged bar." Doctoral thesis, Università Politecnica delle Marche, 2022. https://hdl.handle.net/11566/299871.

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La crescente necessità di utilizzare e preservare le aree costiere richiede una più approfondita conoscenza delle dinamiche costiere e una migliore capacità di modellare questi processi. Nello studio della propagazione delle onde verso riva occorre considerare la presenza di eventuali strutture di difesa della costa, come le scogliere emerse e sommerse, che modificano fortemente il campo di moto. Questa tesi ha l’obiettivo di approfondire la conoscenza dei meccanismi fisici di interazione non lineare tra onde e strutture costiere. A tal fine sono stati condotti esperimenti di laboratorio pe

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Choi, Young-Myung. "Two-way coupling between potential and viscous flows for a marine application." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0046.

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Ce travail propose une méthodologie de couplage bidirectionnel entre un modèle Navier-Stokes et un modèle fluide parfait potentiel pour des applications d’ingénierie marine et particulièrement d’interaction houlestructure. Les quantités d’intérêt sont décomposées comme la somme d’un terme d’écoulement incident et un terme d’écoulement complémentaire. Un modèle potentiel non-linéaire (HOS : High-Order Spectral) est utilisé pour l’écoulement incident. L’écoulement complémentaire est traité par des modèles de fluide visqueux et de fluide parfait potentiel. Le modèle fluide visqueux est basé sur l

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Holmberg, Andreas. "Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows." Licentiate thesis, KTH, MWL Strömningsakustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26133.

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In this thesis, the in-duct experimental methods for determining aeroacoustic N-ports of in-duct elements are discussed and improved. The scattering matrix determination methods and the related wave decomposition methods are evaluated from measurements in an empty duct carrying a mean flow. The improvements of a new over-determination method for the source part of the N-port is studied using simulations and measurements; in quiescent air as well as measurements of the flow associated noise of a mixer plate, here a triangular plate inserted at an angle in a duct. The new method is shown to impr

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Tichoň, Dušan. "Analýza šíření tlakové vlny v aortě." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418205.

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The aim of this diploma thesis is to assess the applicability of pulse wave propagation monitoring in the cardiovascular system in the field of prediction and early diagnosis of abdominal aortic aneurysm (AAA). The very first part is focused on description of heart and blood vessels with its pathological changes in presence of aneurysm. For this reason, current methods of monitoring and surgical treating of AAA were mentioned. Due to their difficult clinical use widely in the population, new methods based on pulse wave monitoring were presented. Using an analytical approach we estimated the di

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MARINI, FRANCESCO. "Wave induced hydro and morpho-dynamics around a single slender pile: experimental and numerical analysis." Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/274622.

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Negli ultimi anni, la presenza in mare di strutture fondate su pali, come piattaforme petrolifere e turbine eoliche offshore, sta diventando sempre più importante. Per questa ragione, guadagna sempre più importanza l’analisi di possibili criticismi e incertezze nella loro progettazione. L’obiettivo di questa tesi è lo studio dell’idro e della morfodinamica indotta da onde regolari e non su un palo di piccolo diametro attraverso una modellazione fisica e numerica. Questa tesi vuole quindi dare un contributo per la comprensione di tali processi fisici. In particolare, si vogliono fornire degli s

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Fashanu, Udofe Peter Taiwo. "Simulation and analysis of wave-structure interactions." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1310.

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Today, it is widely recognized that Computational Fluid Dynamics (CFD) methodologies should be used for the analysis of Engineering systems and that design and method of simulation must be practical and realistic to provide cost effective solutions. The recent development in CFD of Engineering Structures has led to the adoption of the Eulerian and Lagrangian concepts of numerical analysis. Although the importance of these concepts cannot be overemphasised in offshore structures hydrodynamics, thus the choice of a concept to define the flow field surrounding a structure is one of the fundamenta

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Birgersson, Fredrik. "Prediction of random vibration using spectral methods." Doctoral thesis, KTH, Aeronautical and Vehicle Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3694.

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<p>Much of the vibration in fast moving vehicles is caused bydistributed random excitation, such as turbulent flow and roadroughness. Piping systems transporting fast flowing fluid isanother example, where distributed random excitation will causeunwanted vibration. In order to reduce these vibrations andalso the noise they cause, it is important to have accurate andcomputationally efficient prediction methods available.</p><p>The aim of this thesis is to present such a method. Thefirst step towards this end was to extend an existing spectralfinite element method (SFEM) to handle excitation of

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Szubert, Damien. "Physics and modelling of unsteady turbulent flows around aerodynamic and hydrodynamic structures at high Reynold number by numerical simulation." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15129/2/szubert_1.pdf.

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This thesis aims at analysing the predictive capabilities of statistical URANS and hybrid RANS-LES methods to model complex flows at high Reynolds numbers and carrying out a physical analysis of the near-region turbulence and coherent structures. This study handles configurations included in the European research programmes ATAAC (Advanced Turbulent Simulation for Aerodynamics Application Challenges) and TFAST (Transition Location Effect on Shock Wave Boundary Layer Interaction). First, the detached flow in a configuration of a tandem of cylinders, positionned behind one another, is investigat

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Fortes-Patella, Regiane. "Analyse de l'érosion de cavitation par simulations numériques d'impacts." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0018.

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La reponse dynamique de divers materiaux soumis a des impacts de jets ou d'ondes de surpression a ete simulee a l'aide d'un modele elastoplastique. Les geometries des empreintes ainsi generees numeriquement ont ete comparees a celles d'empreintes observees experimentalement sur des echantillons soumis a la cavitation d'eau et de mercure. On a constate que l'emission d'une onde de surpression etait la cause principale des dommages observes. Une etude parametrique du phenomene d'onde de supression a ete effectuee. Cette etude a servi de base pour le trace d'histogrammes classant le nombre d'impa

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Li, Sijia. "Couches absorbantes pour la propagation d'ondes dans les sols non bornés à l’aide de la décomposition en sous-domaines et l'intégration temporelle hybride asynchrone." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI042.

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Le travail de thèse a pour objet de proposer de nouvelles formulations de couches absorbantes artificielles aux frontières des maillages éléments finis pour la simulation numérique de la propagation d’ondes dans des milieux infinis 2D et 3D, afin de traiter des problèmes complexes d’interaction sol-structure en dynamique transitoire. Trois couches absorbantes sont développées : les couches absorbantes basées sur les amortissements de Rayleigh ou de Kosloff et les PML (Perfectly Matched Layers). En étudiant analytiquement la forme forte de la propagation des ondes dans chaque milieu, il est mon

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