Bibliographies thématiques / Fluid-Structure impact

Littérature scientifique sur le sujet « Fluid-Structure impact »

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Publié le 20 juillet 2024

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Articles de revues sur le sujet "Fluid-Structure impact"

Vesenjak, Matej, Zoran Ren et Mojtaba Moatamedi. « Multiphysics Study of Structural Impact to Fluidic Media ». Materials Science Forum 673 (janvier 2011) : 1–10. http://dx.doi.org/10.4028/www.scientific.net/msf.673.1.

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The paper presents a fluid structure interaction based numerical study of impact loading for a hemispherical structure upon water and a space capsule water landing. The study has a strong relevance in the determination of the crashworthiness of aerospace structures upon water impact loading. Finite element based numerical techniques have been used for the analysis of the underlying transient dynamic and fluid-structure interaction. Smoothed Particle Hydrodynamics (SPH) and Arbitrary Lagrange-Eulerian (ALE) methods have been used to simulate the behaviour of the fluid (water) under impact conditions. The accelerations and velocities of the impacting objects have been validated with by experimental measurements and analytical results. Numerical analyses showed a strong potential for the use of developed computational fluid structure interaction models for analyses of water impact loading related problems.

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Wagner, Simon, Rasoul Sheikhi, Fabian Kayatz, Manuel Münsch, Marek Hauptmann et Antonio Delgado. « Fluid–structure‐interaction simulations of forming‐air impact thermoforming ». Polymer Engineering & ; Science 62, n^o 4 (9 février 2022) : 1294–309. http://dx.doi.org/10.1002/pen.25926.

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Zhang, Qingjie, Qinghua Qin et Jianzhong Wang. « A theoretical model on coupled fluid-structure impact buckling ». Applied Mathematical Modelling 17, n^o 1 (janvier 1993) : 25–33. http://dx.doi.org/10.1016/0307-904x(93)90124-y.

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Pacek, Dawid, et Roman Gieleta. « The fluid-based structure for human body impact protection ». Journal of Physics : Conference Series 1507 (mars 2020) : 032016. http://dx.doi.org/10.1088/1742-6596/1507/3/032016.

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Sun, Shili, et Guoxiong Wu. « Fully nonlinear simulation for fluid/structure impact : A review ». Journal of Marine Science and Application 13, n^o 3 (27 août 2014) : 237–44. http://dx.doi.org/10.1007/s11804-014-1253-y.

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Gu, Hua, et Gen Hua Yan. « Research on the Effect of Fluid-Structure Interaction on Dynamic Response of Gate Structure ». Advanced Materials Research 199-200 (février 2011) : 811–18. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.811.

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This essay reveals that on the basis of fluid-structure interaction having appreciable impact on auto-vibration of gate structure, analysis and calculation on dynamic response characteristics of gate structural fluid-structure interaction have been conducted. The results indicate that under the same dynamic load the structural dynamic response value with fluid-structure interaction effect considered is remarkably larger than vibration response with fluid-structure interaction effect considering. The calculating results indicate that the largest response increase of typical parts of gate structure is from 50% to 60%. Therefore, as to making calculations on structural dynamic response with fluid-structure interaction effect, the impact flow field exerting on structural response should be taken into consideration.

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INABA, Kazuaki, et Joseph E. SHEPHERD. « OS0907 Impact generated stress waves and coupled fluid-structure responses in a fluid-filled tube ». Proceedings of the Materials and Mechanics Conference 2009 (2009) : 182–83. http://dx.doi.org/10.1299/jsmemm.2009.182.

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Griffith, Boyce E., et Neelesh A. Patankar. « Immersed Methods for Fluid–Structure Interaction ». Annual Review of Fluid Mechanics 52, n^o 1 (5 janvier 2020) : 421–48. http://dx.doi.org/10.1146/annurev-fluid-010719-060228.

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Fluid–structure interaction is ubiquitous in nature and occurs at all biological scales. Immersed methods provide mathematical and computational frameworks for modeling fluid–structure systems. These methods, which typically use an Eulerian description of the fluid and a Lagrangian description of the structure, can treat thin immersed boundaries and volumetric bodies, and they can model structures that are flexible or rigid or that move with prescribed deformational kinematics. Immersed formulations do not require body-fitted discretizations and thereby avoid the frequent grid regeneration that can otherwise be required for models involving large deformations and displacements. This article reviews immersed methods for both elastic structures and structures with prescribed kinematics. It considers formulations using integral operators to connect the Eulerian and Lagrangian frames and methods that directly apply jump conditions along fluid–structure interfaces. Benchmark problems demonstrate the effectiveness of these methods, and selected applications at Reynolds numbers up to approximately 20,000 highlight their impact in biological and biomedical modeling and simulation.

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Baragamage, Dilshan S. P. Amarasinghe, et Weiming Wu. « A Three-Dimensional Fully-Coupled Fluid-Structure Model for Tsunami Loading on Coastal Bridges ». Water 16, n^o 1 (4 janvier 2024) : 189. http://dx.doi.org/10.3390/w16010189.

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A three-dimensional (3D) fully-coupled fluid-structure model has been developed in this study to calculate the impact force of tsunamis on a flexible structure considering fluid-structure interactions. The propagation of a tsunami is simulated by solving the 3D Navier–Stokes equations using a finite volume method with the volume-of-fluid technique. The structure motion under the tsunami impact force is simulated by solving the motion equation using the generalized alpha method. The structure motion is fed back into the fluid solver via a technique that combines a sharp-interface immersed boundary method with the cut-cell method. The flow model predicts accurate impact forces of dam-break flows on rigid blocks in three experimental cases. The fully coupled 3D flow-structure model is tested with experiments on a large-scale (1:5) model bridge under nonbreaking and breaking solitary waves. The simulated wave propagation and structure restoring forces generally agree well with the measured data. Then, the fully-coupled fluid-structure model is compared with an uncoupled model and applied to assess the effect of flexibility on structure responses to tsunami loading, showing that the restoring force highly depends on the dynamic characteristics of the structure and the feedback coupling between fluid and structure. The maximum hydrodynamic and restoring forces decrease with increasing structure flexibility.

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Lu, Tao, Jiaxia Wang, Kun Liu et Xiaochao Zhao. « Experimental and Numerical Prediction of Slamming Impact Loads Considering Fluid–Structure Interactions ». Journal of Marine Science and Engineering 12, n^o 5 (28 avril 2024) : 733. http://dx.doi.org/10.3390/jmse12050733.

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Slamming impacts on water are common occurrences, and the whipping induced by slamming can significantly increase the structural load. This paper carries out an experimental study of the water entry of rigid wedges with various deadrise angles. The drop height and deadrise angle are parametrically varied to investigate the effect of the entry velocity and wedge shape on the impact dynamics. A two-way coupled approach combing CFD method software STAR-CCM+12.02.011-R8 and the FEM method software Abaqus 6.14 is presented to analyze the effect of structural flexibility on the slamming phenomenon for a wedge and a ship model. The numerical method is validated through the comparison between the numerical simulation and experimental data. The slamming pressure, free surface elevation, and dynamic structural response, including stress and strain, in particular, are presented and discussed. The results show that the smaller the inclined angle at the bottom of the wedge-shaped body, the faster the entry speed into the water, resulting in greater impact pressure and greater structural deformation. Meanwhile, studies have shown that the bottom of the bow is an area of concern for wave impact problems, providing a basis for the assessment of ship safety design.

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Thèses sur le sujet "Fluid-Structure impact"

Song, B. « Fluid/structure impact with air cavity effect ». Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1469187/.

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Violent wave attacking offshore and coastal structures is a complex phenomenon frequently involving air entrapment. A study on fluid/structure impact with air cavity effect is carried out in the framework of velocity potential theory. The purpose is twofold. One is to develop methodologies to tackle the technical difficulties involved. The other is to achieve a better insight into the impact dynamics and the subsequent structure/water/air interaction process, as well as the associated air cavity effect and its acting mechanism. The study starts with axisymmetric problems. Impact by a liquid column on a rigid plate is studied analytically and numerically. The initial singularity at the body-free surface intersection is analysed in detail. The feature of the resulting long thin jet is revealed: providing field solution over larger wetted area without influencing the main impact dynamics. This is favourable in the study of some problems (e.g. steady state solution or local impact over a tiny region), and thus a decoupled shallow water approximation scheme is developed for the computation with long jet. Impact with air cavity of various parameters is studied systematically. Wave impact with air entrapment in practical engineering situations is then focused. A domain decomposition method together with a dual-system technique is developed to provide fully nonlinear simulation on the early impact stage by a plunging wave crest, tackling the large variation in scales involved. Local pressure peak is found to be generated by the sharp turn of the wave surface along the wall. The trapped cavity, governed by an adiabatic law, is found to cause oscillating loading on the wall. The local free jet drawn from the upper cavity surface in each re-contraction stage reveals its distortion and fragmentation mechanism. The initial dimensionless potential energy of the air cavity is found to largely influence its maximum pressure, and the scaling law revealed could be applied to the prediction of impact pressure in practical situations from a laboratory experiment.

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Zekri, H. J. « The influence of gravity on fluid-structure impact ». Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/59670/.

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Fluid-structure interaction is a well-known and complicated problem. Its formulation requires simplifications in modelling, and usually the presence of gravity is one aspect which is neglected, especially in violent impact. In this thesis we account for the influence of gravity on two physically different but mathematically similar two-dimensional flows. First (in Chapters 2{4), sloshing impact of a standing wave on the lid of a rigid tank, and second (in Chapter 5), impact of a rigid blunt body entering water which is initially at rest. Chapter 1 presents the motivation, literature, aim and structure of the thesis. In Chapter 2, gravity is neglected and model equations are solved analytically, in particular the linearised hydrodynamic problem with and without the lid using the Wagner approximation, time and coordinate stretching, and displacement potential. Chapter 3, introduces gravity into the formulation and the model is solved semi-analytically to determine its influence on the width of the wetted region and on the pressure distribution on the lid during impact. We numerically find the effect of gravity on the moving contact points, hydrodynamic pressure, and surface elevation in Chapter 4. Chapter 5 studies the influence of gravity on the impact of a blunt body entering vertically with a constant speed into an initially at water. All problems are formulated and solved within the Wagner model. In both problems we found visible effects of gravity on the positions of moving contact points after the early stage of impact. Gravity shortens the size of the wetted region. Consequently, the velocities of the contact points are decreased by gravity. The effect of gravity on the surface elevation is shown for both problems. Negative hydrodynamic pressures and forces are found during the sloshing impact stage when gravity is neglected. Numerically, it was found that gravity decreases the hydrodynamic pressure on the lid of the tank. Similarly the hydrodynamic pressure is found to be decreased by gravity in the water-entry problem. Also in the water-entry problem it is shown that gravity increases both the thickness and the mass flux into the spray jets. Also the total energy (potential and kinetic) of the system, and the work done by the body on the fluid are decreased by gravity.

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Conner, Ryan P. « Fluid Structure Interaction Effects on Composites Under Low Velocity Impact ». Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/7324.

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In this study composite materials were tested in different fluid environments to determine the role of Fluid Structure Interaction with these composites under a lower velocity impact. The purpose of this research is to develop a better understanding of possible marine applications of composite materials. This was done using a low velocity impact machine and two composite types. The first composite is made from a multi-ply symmetrical plain weave 6 oz. E-glass skin. The test area of the composites is 12 in by 12 in (30.5 cm by 30.5 cm) with clamped boundary conditions. The testing was done using a drop weight system to impact the center of the test area. A Plexiglas box in conjunction with the impact machine was used to keep the top of the composite sample dry while it was submerged in approximately 15 inches (38.10 cm) of water. The second composite type was constructed using the same methods, but was made from a Carbon Fiber Reinforced Polymer (CFRP) instead of the E-glass skin. These samples were pre-cracked and tested using the same impact machine in 15 inches (38.10 cm) of water. The overall size of these samples was 42 cm long and 3 cm wide forming a long thin rectangular shape. The test area of these samples was a 20 cm long section of the sample with the outsides being clamped to achieve the desired boundary conditions. Two variations of these samples were tested. The first was reinforced with Multi-Walled Carbon Nanotubes (MWCNTs) and the second had no reinforcements at the interface layer in front of the pre-cracks. Output from both tests was recorded using strain gauges and a force impact sensor. The results show that an added mass from the water plays a large role in the Fluid Structure Interaction with composites due to the similar densities of water and the composites.

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Messahel, Ramzi. « ALE and SPH formulations for Fluid Structure Interaction : shock waves impact ». Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10022/document.

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Ce travail de thèse porte sur l’étude numérique de la propagation d’ondes de choc dans les écoulements compressibles multiphasiques et en interaction (fluide-structure). Deux approches sont étudiées pour la résolution numérique de la partie fluide : L’approche ALE (Arbitrary Lagrangian Eulerian) et l’approche lagrangienne SPH (Smoothed Particle Hydrodynamics) ; la partie structure, quant à elle, est résolue par une approche classique EF (Éléments finis). L’étude des méthodes ALE et SPH constituent les deux principaux axes de recherche. La problématique des coups de bélier dans l’ingénierie nucléaire est abordée dans cette thèse. Lors d’un coup de bélier, les nombreuses réflexions d’ondes de choc dans les tuyauteries nucléaires peuvent faire baisser la pression de l’eau en dessous de sa pression de saturation et générer localement de la cavitation. Le modèle HEM (Homogeneous Equilibrium Model) de changement de phase proposé par Saurel et al. (1999) à trois équations est étudié et appliqué aux coups de bélier. Les résultats obtenus sont comparés aux données expérimentales. Malgré l’utilisation des techniques de renormalisation en SPH, des instabilités (oscillations numériques) se développent à l’interface entre les particules de matériaux différents. Ces instabilités restreignent l’utilisation des schémas SPH classiques pour des problèmes à faible ratio de densité. Afin de résoudre les problèmes de choc, le schéma proposé par Hu et Adams (2006) est adapté au régime fortement compressible en considérant le couplage entre la densité et la longueur de lissage. Les différents schémas SPH sont comparés entre eux pour les problèmes de chocs multiphasiques en 1-D et 2-D. Les résultats SPH sont validés avec la solution exacte pour les problèmes 1-D et la solution ALE pour les problèmes 2-D
This 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

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Hendry, Stephen R. « Projectile impact of fluid backed metal beams and plates : experiments and numerical simulation ». Thesis, University of Aberdeen, 1985. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU356814.

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The growth of the nuclear power industry has provided a considerable stimulus for investigations into fluid-structure interaction problems. The safety case for nuclear reactors requires an understanding of the impact response of structures enclosing or surrounded by fluids. In many cases the structural response is in excess of that which can be predicted by elastic analyses and both material and geometrical non-linearities must be considered. The understanding of the interaction between the structure and the contained fluid poses additional problems which, in the extreme loading conditions envisaged, have received little attention. There is a lack of data relating to basic fluid-structure interaction problems involving dynamic plastic structural impact. Two sets of experiments are described which were carried out to provide some such data. The first set of experiments considered beams, both fully clamped (leading to large membrane forces) and partially clamped (preventing rotational and transverse motion while allowing the beam material to be fed in from the supports), struck centrally by a projectile. The second set of experiments considered a circular plate clamped around its periphery, sealing a volume of fluid, and struck centrally by a projectile. The shape of the plates and beams as they deformed were recorded, as were the pressure variations during the tests. In both sets of experiments the main contribution of the fluid to the beam or plate response was to localise the deformations. The early deformation of the beams was limited to the centre half span and the deformation only spread to the ends of the beams as the supporting effect of the fluid was lost due to the fluid escaping. In the plate experiments, where a good seal could be achieved, the deformation throughout was localised compared with a similar plate in air. The deformation in these cases was limited to a central disc of approximately half the plate diameter. The pressures recorded during the tests suggest that the fluid response was predominantly incompressible. A finite element program was written to model the response of beams and circular plates (axisymmetric problems). A brief history of the finite element method, the background theory and the development of the method to treat non-linear, large displacement, dynamic problems are given. The results are presented for a number of beam and plate problems, both those described above and other problems for which data was available. The finite element program was found to give good predictions of the deforming shapes of both the beams and the plates. No detailed analysis of the fluid was carried out, but two types of approximation to the effect of the fluid were investigated. Firstly a time varying pressure pulse (based on the measured pressure pulses) or a pressure loading derived from the beam velocity (acoustic and incompressible fluid approximations) were used to represent the loading on the beam due to the fluid. Secondly a mass was added to the plate mass to represent the inertia of the fluid. The applied pressure loading worked to a limited extent for the beams but no one pressure pulse shape gave good results for both end fixities. The best results for the plate problem were achieved with the added mass approach. Finally a number of areas of experimental and computational work are identified, which it is felt would benefit from further study.

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McCrillis, Ryan D. « Dynamic failure of sandwich beams with fluid-structure interaction under impact loading ». Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5101.

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Approved for public release; distribution is unlimited
The objective of this research is to examine the added mass effect that water has on the dynamic response of a sandwich composite under impact, particularly impact leading to failure. Because sandwich composites are much less dense than water, fluid structure interaction plays a large part in the failure. Composite samples were constructed using vacuum assisted transfer molding, with a 6.35 mm balsa core and symmetrical plain weave 6 oz E-glass skins. The experiment consisted of three phases. First, using threepoint bending, strain rate characteristics were examined both in air and under water. After establishing that the medium had no effect on the beam response under different strain rates, but confirming that previously established relationships between strain rate and ultimate strength for axially loaded glass composites can be applies to sandwich construction in bending, the experiment progressed to impact testing where each specimen, again a one inch wide beam, was subjected to progressively increasing force. The data from this phase showed that submerged samples failed at lower drop heights and lower peak forces with a failure mode dominated by center span skin compression failure. Beams in air were able to withstand higher drop heights and peak forces. Dry sample failure mode was dominated by skin compression failure at the clamped support with occasional evidence of shear failure through the core adjacent to the clamped support. The data from this study will increase understanding of sandwich composite characteristics subjected to underwater impact.

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Lee, June. « Hydro-impact, fluid-structure interaction and structural response of modern racing yacht ». Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/142787/.

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In recent years, faster, lighter and bigger are the key issues in a modern racing yacht for extreme performance. As a result, many yachts have experienced various structural failures caused by the hydrodynamic impact or ’hydro-impact’ phenomenon by slamming. The structural failure by hydro-impact originates from the facts that the external hydro-impact load and fluid structure interaction effect is somewhat misled and when applying the load into current structural design, the ’dynamic’ load is typically, manipulated in a ’static’ way with fluid structure interaction effect, generally, ignored. In this thesis, the hydro-impact load by slamming, its fluid structure interaction effect and dynamic response of the local structure of the yacht are studied. Firstly, to acquire insight into the hydro-impact phenomenon, a series of drop tests and seakeeping-slamming tests are carried out with various sensing instruments of pressure transducers, accelerometer and ’slam patch system’ - a specific application form of generally known pressure panel - are installed. The slam patch system is designed and implemented to investigate the hydro-impact loads and fluid structure interaction effect of slamming. Afterward, the measured hydro-impact loads are summarised via statistical manipulations with regard to pressure and duration time. Secondly, impact pressure by the rules and regulations of various organisations are provided to compare it with the experimental results and structural response calculations. The applicability of the rules and regulations on the high performance racing yacht is also pointed out. Finally, the manipulated loads are used as input data to simulate the transient response of local structure of the yacht structure. Throughout this study, the dynamic and fluid structure interaction effect by hydroimpact phenomenon on local composite structure can be easily visualised and calculated in a conservative way through conventional finite element analysis work.

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Owens, Angela C. « An experimental study of fluid structure interaction of carbon composites under low velocity impact ». Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FOwens.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2009.
Thesis Advisor: Kwon, Young W. Second Reader: Didoszak, Jarema M. "December 2009." Description based on title screen as viewed on January 26, 2010. Author(s) subject terms: Composite, Carbon, Low Velocity Impact, Fluid Structure Interaction. Includes bibliographical references (p. 49-50). Also available in print.

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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.

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Les impacts hydrodynamiques entre structures solides et liquides jouent un rôle crucial dans des domaines comme l'ingénierie côtière, l'aéronautique et les énergies renouvelables. Cette thèse se focalise sur l'effet peu exploré de l'aération, où l'air sous forme de bulles ou de poches modifie significativement les forces d'impact et les réponses hydrodynamiques. L'objectif central de cette thèse est d'approfondir notre compréhension des effets de l'aération sur les dynamiques complexes d'impact hydrodynamique. Cette recherche se concentre sur deux configurations expérimentales distinctes : l'impact d'une plaque plane sur une surface d'eau calme et l'impact d'un jet d'eau aéré sur une plaque plane. L'enjeu est d'examiner l'influence de l'aération sur les pressions d'impact et les fréquences d'oscillation post-impact. Pour atteindre ces objectifs, des dispositifs expérimentaux ont été conçus pour chaque cas d'étude. Ces expériences modèles nous offrent la possibilité de contrôler avec précision des paramètres cruciaux tels que la vitesse d'impact, les dimensions de la plaque, la pression ambiante, etc. Parallèlement, une attention particulière a été portée à la mesure des taux d'aération et des pressions d'impact, permettant ainsi une analyse rigoureuse des résultats. Pour l'impact de la plaque, les observations ont montré que les pressions maximales d'impact et les impulsions dévient de la théorie de von Karman, principalement à cause de l'effet amortissant de l'air. La diminution de la pression ambiante augmente les pressions d'impact, suggérant une atténuation de l'effet de coussin d'air. Concernant l'impact d'un jet d'eau aéré, une diversité de régimes d'écoulement, tels que les régimes à bulles, en bouchons, agités, et annulaires a été identifiée. L'interaction entre le nombre d'injecteurs, la pression d'air, et les caractéristiques des bulles illustre une interdépendance significative. Les effets de l'aération sur les pressions d'impact et les fréquences d'oscillation démontrent que des structures plus grandes induisent des oscillations plus lentes et des pressions adimensionnelles augmentées
Hydrodynamic 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

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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 understanding of the wave impact problems as well as to create a numerical tool suitable for simulation of such problems. The study included the consideration of moving boundaries in order to include the coupled interactions of the body and fluid. The thesis is organized into two experimental and numerical parts. There is a lack of benchmarking experimental data for studying fluid-structure interactions with moving boundaries. In the experimental part of this research, novel experiments were, therefore, designed and performed that were useful for validation of the numerical developments. By considering a dynamical system with only one degree of freedom, the complexity of the experiments performed was minimal. The setup included a plate that was attached to the bottom of a flume via a hinge and tethered by two springs from the top one at each side. The experiments modelled fluid-structure interactions in three subsets. The first subset studied a highly nonlinear decay test, which resembled a harsh wave impact (or slam) incident. The second subset included waves overtopping on the vertically restrained plate. In the third subset, the plate was free to oscillate and was excited by the same waves. The wave overtopping the plate resembled the physics of the green water on fixed and moving structures. An analytical solution based on linear potential theory was provided for comparison with experimental results. ... In simulation of the nonlinear decay test, the SPH results captured the frequency variation in plate oscillations, which indicated that the radiation forces (added mass and damping forces) were calculated satisfactorily. In simulation of the nonlinear waves, the waves progressed in the flume similar to the physical experiments and the total energy of the system was conserved with an error of 0.025% of the total initial energy. The wave-plate interactions were successfully modelled by SPH. The simulations included wave run-up and shipping of water for fixed and oscillating plate cases. The effects of the plate oscillations on the flow regime are also discussed in detail. The combination of experimental and numerical investigation provided further understanding of wave impact problems. The novel design of the experiments extended the study to moving boundaries in small scale. The use of SPH eliminated the difficulties of dealing with free-surface problems so that the focus of study could be placed on the impact forces on fixed and moving bodies.

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Livres sur le sujet "Fluid-Structure impact"

Ma, D. C. Sloshing, Fluid-Structure Interaction, and Structural Response Due to Shock and Impact Loads, 1994 : Presented at the 1994 Pressure Vessels and Piping (Pvp). American Society of Mechanical Engineers, 1994.

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Sloshing, fluid-structure interaction, and structural response due to shock and impact loads, 1994 : Presented at the 1994 Pressure Vessels and Piping Conference, Minneapolis, Minnesota, June 19-23, 1994. New York, N.Y : American Society of Mechanical Engineers, 1994.

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Sidhu, Kulraj S., Mfonobong Essiet et Maxime Cannesson. Cardiac and vascular physiology in anaesthetic practice. Sous la direction de Jonathan G. Hardman. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199642045.003.0001.

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This chapter discusses key components of cardiovascular physiology applicable to clinical practice in the field of anaesthesiology. From theory development to ground-breaking innovations, the history of cardiac and vascular anatomy, as well as physiology, is presented. Utilizing knowledge of structure and function, parameters created have allowed adequate patient clinical assessment and guided interventions. A review of concepts reveals the impact of multiple physiological variables on a patient’s haemodynamic state and the need for more accurate and efficient measurements. In particular, it is noted that a more reliable index of ventricular contractility is the end-systolic elastance rather than the ejection fraction. Constant direct preload assessment has not yet been achieved but continues to be determined through surrogate variables, and continuous cardiac output monitoring for oxygen delivery, although advancing, has limitations. Considering the effect of compound factors perioperatively, especially heart failure, modifies the goals and interventions of anaesthetists to achieve improved outcomes. Therefore, medical management prior to surgery and complete assessment through history, physical examination, and diagnostic tests are a priority. This chapter also details the expectations following volume expansion to augment haemodynamics during surgery, the concept of functional haemodynamic monitoring, and limitations to the parameters applied in assessing fluid responsiveness. Challenging the accuracy of conventional indices to predict volume status led to the use of goal-directed therapy, reducing morbidity and minimizing length of hospital stay. The mainstay of this chapter is to reinforce the relevance of advances in haemodynamic monitoring and homeostasis optimization by anaesthetists during surgery, using fundamental concepts of cardiovascular physiology.

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Chapitres de livres sur le sujet "Fluid-Structure impact"

Kramer, F., M. Fuchs, T. Knacke, C. Mockett, E. Özkaya, N. Gauger et F. Thiele. « Impact of Optimized Trailing Edge Shapes on Noise Generation ». Dans Fluid-Structure-Sound Interactions and Control, 223–28. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4960-5_35.

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Gholijani, Alireza, Sebastian Fischer, Tatiana Gambaryan-Roisman et Peter Stephan. « High Resolution Measurements of Heat Transfer During Drop Impingement onto a Heated Wall ». Dans Fluid Mechanics and Its Applications, 291–310. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_15.

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AbstractDrop impact on a hot surface heated above the saturation temperature of the fluid plays an important role in spray cooling. The heat transferred from the wall to the fluid is closely interrelated with drop hydrodynamics. If the surface temperature is below the Leidenfrost temperature, the heat transport strongly depends on the transport phenomena in the vicinity of the three-phase contact line. Due to extremely high local heat flux, a significant fraction of the total heat flow is transported through this region. The local transport processes near the three-phase contact line, and, therefore, the total heat transport, are determined by the wall superheat, contact line velocity, system pressure, fluid composition, surface structure and physical properties on the wall. The effect of the aforementioned influencing parameters on fluid dynamics and heat transport during evaporation of a single meniscus in a capillary slot are studied in a generic experimental setup. The hydrodynamics and evolution of wall heat flux distribution during the impact of a single drop onto a hot wall are also studied experimentally by varying the impact parameters, wall superheat, system pressure, and wall topography. In addition, the fluid dynamics and heat transport behavior during vertical and horizontal coalescence of multiple drops on a heated surface are studied experimentally.

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Komor, S. C., J. W. Valley, P. E. Brown et B. Collini. « Fluid Inclusions in Granite from the Siljan Ring Impact Structure and Surrounding Regions ». Dans Deep Drilling in Crystalline Bedrock, 180–208. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73452-6_18.

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Schmitt, S., S. Stephan, B. Kirsch, J. C. Aurich, H. M. Urbassek et H. Hasse. « Molecular Dynamics Simulation of Cutting Processes : The Influence of Cutting Fluids at the Atomistic Scale ». Dans Proceedings of the 3rd Conference on Physical Modeling for Virtual Manufacturing Systems and Processes, 260–80. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35779-4_14.

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AbstractMolecular dynamics simulations are an attractive tool for studying the fundamental mechanisms of lubricated machining processes on the atomistic scale as it is not possible to access the small contact zone experimentally. Molecular dynamics simulations provide direct access to atomistic process properties of the contact zone of machining processes. In this work, lubricated machining processes were investigated, consisting of a workpiece, a tool, and a cutting fluid. The tool was fully immersed in the cutting fluid. Both, a simple model system and real substance systems were investigated. Using the simplified and generic model system, the influence of different process parameters and molecular interaction parameters were systematically studied. The real substance systems were used to represent specific real-world scenarios. The simulation results reveal that the fluid influences mainly the starting phase of an atomistic level cutting process by reducing the coefficient of friction in this phase compared to a dry case. After this starting phase of the lateral movement, the actual contact zone is mostly dry. For high pressure contacts, a tribofilm is formed between the workpiece and the cutting fluid, i.e. a significant amount of fluid particles is imprinted into the workpiece crystal structure. The presence of a cutting fluid significantly reduces the heat impact on the workpiece. Moreover, the cutting velocity is found to practically not influence the coefficient of friction, but significantly influences the dissipation and, therefore, the temperature in the contact zone. Finally, the reproducibility of the simulation method was assessed by studying replica sets of simulations of the model system.

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Ren, Weizhe, Shuyou Zhang, Danrong Song, Meng Zhang et Wei Wang. « The Dynamic Response Analysis Method of Steel Containment in Floating Nuclear Power Plant ». Dans Springer Proceedings in Physics, 764–75. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_66.

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AbstractDuring the operation of the floating nuclear power plant, if the floating nuclear power plant is anchored near the shore for power generation, it may be impacted by runaway ships. If the impact causes damage to the tank of the floating nuclear power plant and water inflow, and even damage to the containment structure, it will seriously threaten the structural safety of the floating nuclear power plant and even threaten nuclear safety. This paper uses the explicit dynamics method to establish two models of dry/wet impact. It assumes that the 5000T container ship will laterally impact the reactor compartment of the floating nuclear power plant at a speed of 2 m/s, and the effects of the fluid domain (water and air domain) are ignored/counted in the calculation process. Then, comparing the effects of the above two models of dry/wet impact on the calculation duration, the damage and water ingress state of the floating nuclear power plant, the stress of the steel containment (including support). Studies have shown that if the relevant personnel do not need to understand the effect of water intrusion into the damaged cabin, the influence of water and air domain on the impact simulation results can be ignored, and the dry model can be directly used for calculation.

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Topinka, Lukáš, Radomír Pruša, Rostislav Huzlík et Joachim Regel. « Definition of a Non-contact Induction Heating of a Cutting Tool as a Substitute for the Process Heat for the Verification of a Thermal Simulation Model ». Dans Lecture Notes in Production Engineering, 333–44. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_24.

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AbstractDuring metal machining, a large amount of heat is generated in the cutting zone, which has a negative impact on machining accuracy due to the thermal expansion of the materials. To reduce the temperature in the cutting zone, liquid coolants are used which increase the costs and can have a negative impact on the environment. This problem is being studied using Computational Fluid Dynamics (CFD) to better understand the behavior of the coolant flow in the cutting zone, which will allow optimization of the use of liquid coolants and the development of a correction method for thermal errors, resulting in more accurate machining with reduced resource and environmental footprints. However, due to the complexity of multiphase CFD simulations, the simulation model must be simplified as much as possible. This is particularly important for the process heat generation, as combining flow simulation of coolant flow around the rotating cutting tool with structural simulation of the milling process, including chip formation, would require excessive computational power. In following paper an alternative method of tool heating by electromagnetic induction is presented and the measurement dependencies required to determine the heat flux induced into the cutting tool are described. This can be further applied as a boundary condition for the numerical simulation as a verification method for the coupled Fluid-Structure Interaction FSI simulation model of the thermally induced deformations of the cutting tool and its holder.

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Haidn, Oskar J., Nikolaus A. Adams, Rolf Radespiel, Thomas Sattelmayer, Wolfgang Schröder, Christian Stemmer et Bernhard Weigand. « Collaborative Research for Future Space Transportation Systems ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 1–30. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_1.

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Abstract This chapter book summarizes the major achievements of the five topical focus areas, Structural Cooling, Aft-Body Flows, Combustion Chamber, Thrust Nozzle, and Thrust-Chamber Assembly of the Collaborative Research Center (Sonderforschungsbereich) Transregio 40. Obviously, only sample highlights of each of the more than twenty individual projects can be given here and thus the interested reader is invited to read their reports which again are only a summary of the entire achievements and much more information can be found in the referenced publications. The structural cooling focus area included results from experimental as well as numerical research on transpiration cooling of thrust chamber structures as well as film cooling supersonic nozzles. The topics of the aft-body flow group reached from studies of classical flow separation to interaction of rocket plumes with nozzle structures for sub-, trans-, and supersonic conditions both experimentally and numerically. Combustion instabilities, boundary layer heat transfer, injection, mixing and combustion under real gas conditions and in particular the investigation of the impact of trans-critical conditions on propellant jet disintegration and the behavior under trans-critical conditions were the subjects dealt with in the combustion chamber focus area. The thrust nozzle group worked on thermal barrier coatings and life prediction methods, investigated cooling channel flows and paid special attention to the clarification and description of fluid-structure-interaction phenomena I nozzle flows. The main emphasis of the focal area thrust-chamber assembly was combustion and heat transfer investigated in various model combustors, on dual-bell nozzle phenomena and on the definition and design of three demonstrations for which the individual projects have contributed according to their research field.

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Jurdic, Vincent, Rob Lever, Adrian Passmore et Mark Scotter. « Rail Roughness Evolution on a Curved Track and Its Impact on Induced Structure Borne Vibration ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 538–45. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70289-2_58.

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Van de Walle, Bartel, Catherine Campbell et Fadi P. Deek. « The Impact of Task Structure and Negotiation Sequence on Distributed Requirements Negotiation Activity, Conflict, and Satisfaction ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 381–94. Cham : Springer International Publishing, 2007. http://dx.doi.org/10.1007/978-3-540-72988-4_27.

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Malvè, Mauro, Myriam Cilla, Estefanía Peña et Miguel Angel Martínez. « Impact of the Fluid-Structure Interaction Modeling on the Human Vessel Hemodynamics ». Dans Advances in Biomechanics and Tissue Regeneration, 79–93. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-816390-0.00005-4.

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Actes de conférences sur le sujet "Fluid-Structure impact"

Le Sausse, P., P. Fabrie et D. Arnou. « Axial length impact on high-speed centrifugal compressor flow ». Dans FLUID STRUCTURE INTERACTION 2013. Southampton, UK : WIT Press, 2013. http://dx.doi.org/10.2495/fsi130231.

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Almasi, A. « New analysis of square section column plastic folding under axial impact for offshore shock absorbers ». Dans FLUID STRUCTURE INTERACTION 2009. Southampton, UK : WIT Press, 2009. http://dx.doi.org/10.2495/fsi090211.

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Hsu, Kwen. « Fluid-Structure Coupled Modeling for HYGE Impact Simulator ». Dans SAE 2005 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2005. http://dx.doi.org/10.4271/2005-01-0747.

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Mitchell, Kenneth N., et Sankaran Mahadevan. « Model Uncertainty in Fluid-Structure Impact Risk Analysis ». Dans ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16189.

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This paper investigates the issue of model uncertainty in risk assessments of fluid-structure impact problems. Model-based risk assessments of complex phenomena such as the space shuttle solid rocket booster (SRB) splashdown event is affected by significant model uncertainty and approximations in finite element discretization, damage modeling, and the probabilistic analysis. Model verification and validation (V&V) helps in systematic assessment of modeling error, and suitable V&V techniques are explored in this paper. Since experimental testing of the SRB is infeasible, a simplified experimental framework is devised using an aluminum cylinder hinged at one end, with the objective of providing insights into the required model form (validation) as well as the required model resolution (verification). Preliminary results from error quantification as well as experimental validation are presented and discussed. Such information could be used to develop confidence and credibility in real-world reliability predictions of fluid-structure impact problems such as SRB splashdown.

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Yang, Xinglin, Bo Chen et Dong Chen. « Base on Fluid-Structure Coupling Transient Impact Analysis of Particular Structure ». Dans 2011 Second International Conference on Digital Manufacturing and Automation (ICDMA). IEEE, 2011. http://dx.doi.org/10.1109/icdma.2011.68.

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Yang, Yang, William Liou, James Sheng, David Gorsich et Sudhakar Arepally. « Shock Wave Impact Simulations Using Fluid/Structure/Dynamics Interactions ». Dans SAE 2011 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2011. http://dx.doi.org/10.4271/2011-01-0258.

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Aquelet, N., et M. Souli. « Fluid-Structure Coupling in a Water-Wedge Impact Problem ». Dans ASME/JSME 2004 Pressure Vessels and Piping Conference. ASME, 2004. http://dx.doi.org/10.1115/pvp2004-2887.

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Lee, F. J., et P. A. Wilson. « Hydro-Impact and Fluid Structure Interaction of Racing Yacht ». Dans The Modern Yacht 2007. RINA, 2007. http://dx.doi.org/10.3940/rina.tmy.2007.05.

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Ilinykh, A. Yu. « Fine Structure Distribution of Immiscible Fluid at The Drop Impact to Fluid Surface ». Dans Topical Problems of Fluid Mechanics 2020. Institute of Thermomechanics, AS CR, v.v.i., 2020. http://dx.doi.org/10.14311/tpfm.2020.012.

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Campbell, J. C., R. Vignjevic et M. H. Patel. « Modelling Fluid-Structure Impact with the Coupled FE-SPH Approach ». Dans William Froude Conference : Advances in Theoretical and Applied Hydrodynamics - Past And Future. RINA, 2010. http://dx.doi.org/10.3940/rina.wfa.2010.12.

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Rapports d'organisations sur le sujet "Fluid-Structure impact"

Yim, Solomon. A Feasibility Study on Numerical Modeling of Large-Scale Naval Fluid-Filled Structure : Contact-Impact Problems. Fort Belvoir, VA : Defense Technical Information Center, février 2011. http://dx.doi.org/10.21236/ada558766.

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Brydie, Dr James, Dr Alireza Jafari et Stephanie Trottier. PR-487-143727-R01 Modelling and Simulation of Subsurface Fluid Migration from Small Pipeline Leaks. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), mai 2017. http://dx.doi.org/10.55274/r0011025.

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The dispersion and migration behavior of hydrocarbon products leaking at low rates (i.e. 1bbl/day and 10 bbl/day) from a pipeline have been studied using a combination of experimental leakage tests and numerical simulations. The focus of this study was to determine the influence of subsurface engineered boundaries associated with the trench walls, and the presence of a water table, upon the leakage behavior of a range of hydrocarbon products. The project numerically modelled three products including diesel, diluted bitumen (dilbit) and gasoline; which were chosen to span a range of fluid types and viscosities. Laboratory simulations of leakage were carried out for the most viscous product (i.e. dilbit) in order to capture plume dispersion in semi-real time, and to allow numerical predictions to be assessed against experimental data. Direct comparisons between observed plume dimensions over time and numerically predicted behavior suggested a good match under low moisture conditions, providing confidence that the numerical simulation was sufficiently reliable to model field-scale applications. Following a simulated two year initialization period, the leakage of products, their associated gas phase migration, thermal and geomechanical effects were simulated for a period of 365 days. Comparisons between product leakage rate, product type and soil moisture content were made and the spatial impacts of leakage were summarized. Variably compacted backfill within the trench, surrounded by undisturbed and more compacted natural soils, results porosity and permeability differences which control the migration of liquids, gases, thermal effects and surface heave. Dilbit migration is influenced heavily by the trench, and also its increasing viscosity as it cools and degases after leakage. Diesel and gasoline liquid plumes are also affected by the trench structure, but to a lesser extent, resulting in wider and longer plumes in the subsurface. In all cases, the migration of liquids and gases is facilitated by higher permeability zones at the base of the pipe. Volatile Organic Compounds (VOCs) migrate along the trench and break through at the surface within days of the leak. Temperature changes within the trench may increase due liquid migration, however the change in predicted temperature at the surface above the leak is less than 0.5�C above background. For gasoline, the large amount of degassing and diffusion through the soil results in cooling of the soil by up to 1�C. Induced surface displacement was predicted for dilbit and for one case of diesel, but only in the order of 0.2cm above baseline. Based upon the information gathered, recommendations are provided for the use and placement of generic leak detection sensor types (e.g liquid, gas, thermal, displacement) within the trench and / or above the ground surface. The monitoring locations suggested take into account requirements to detect pipeline leakage as early as possible in order to facilitate notification of the operator and to predict the potential extent of site characterization required during spill response and longer term remediation activities.

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