Готові списки джерел за темами / Immersed structures

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Добірка наукової літератури з теми "Immersed structures"

Автор: Grafiati
Опубліковано: 5 жовтня 2024

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Статті в журналах з теми "Immersed structures"

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Iguchi, T., T. Sugaya, and Y. Kawano. "Silicon-immersed terahertz plasmonic structures." Applied Physics Letters 110, no. 15 (April 10, 2017): 151105. http://dx.doi.org/10.1063/1.4980018.

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2

Griffith, Boyce E., and Neelesh A. Patankar. "Immersed Methods for Fluid–Structure Interaction." Annual Review of Fluid Mechanics 52, no. 1 (January 5, 2020): 421–48. http://dx.doi.org/10.1146/annurev-fluid-010719-060228.

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Анотація:
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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3

Strychalski, Wanda, and Robert D. Guy. "Viscoelastic Immersed Boundary Methods for Zero Reynolds Number Flow." Communications in Computational Physics 12, no. 2 (August 2012): 462–78. http://dx.doi.org/10.4208/cicp.050211.090811s.

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AbstractThe immersed boundary method has been extensively used to simulate the motion of elastic structures immersed in a viscous fluid. For some applications, such as modeling biological materials, capturing internal boundary viscosity is important. We present numerical methods for simulating Kelvin-Voigt and standard linear viscoelastic structures immersed in zero Reynolds number flow. We find that the explicit time immersed boundary update is unconditionally unstable above a critical boundary to fluid viscosity ratio for a Kelvin-Voigt material. We also show there is a severe time step restriction when simulating a standard linear boundary with a small relaxation time scale using the same explicit update. A stable implicit method is presented to overcome these computation challenges.
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4

Ju, Liehong, Peng Li, and Ji hau Yang. "EXPERIMENTAL RESEARCH ON COEFFICIENT OF WAVE TRANSMISSION THROUGH IMMERSED VERTICAL BARRIER OF OPEN-TYPE BREAKWATER." Coastal Engineering Proceedings 1, no. 32 (January 29, 2011): 55. http://dx.doi.org/10.9753/icce.v32.structures.55.

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Extensive researches have been done for the interaction between open-type pile foundation structure and waves, including uplift force of wharf deck, horizontal force of structure and wave transmission behind breakwaters, among which wave transmission is mainly discussed in this paper. The wave transmission through a single immersed vertical barrier is analyzed by use of the physical model experiment; and an approximate formula to calculate the coefficient of wave transmission through a barrier is presented. Finally the wave damping effect of twin barriers is tested and analyzed.
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5

Cao, Shuai, Chun Hua Xu, Ya Bo Huang, Min Liu, Zi Hao Guo, Bo Wen Cheng, Hai Yang Duan, Lin Ge Han, Ya Nan Fan, and Yu Fei You. "Wetting Property of Cu-Doped ZnO with Micro-/Nano-Structures." Advanced Materials Research 960-961 (June 2014): 61–64. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.61.

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ZnO with different morphologies were formed on Zn foils immersed in various concentrations of CuSO4 solutions. Then the specimens were heated at temperature of 200~600°C in air for 3h. The morphologies of as-prepared specimens were characterized by a scanning electron microscope (SEM). Water wetting angles on the specimens were measured. The results indicate that the morphologies of ZnO on the Zn foils relate to the CuSO4 concentration of in solutions. The morphologies on the specimens with dual-scale (nanoand micro) structure have higher wetting angles than those with flat structure. The water wetting angles can reduce with the increase in annealing temperatures of immersed specimens. The water wetting angles increase with keeping immersed specimens at room temperatures. The change of the wetting angle is explained by absorption of organic carbon on specimen surface and the geometric structure of the surface.
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6

Clark, Joseph A., Paul M. Honke, and J. Michael Ellis. "Holographic measurement of power flow in large immersed structures." Journal of the Acoustical Society of America 89, no. 4B (April 1991): 1977. http://dx.doi.org/10.1121/1.2029748.

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Boilevin-Kayl, Ludovic, Miguel A. Fernández, and Jean-Frédéric Gerbeau. "Numerical methods for immersed FSI with thin-walled structures." Computers & Fluids 179 (January 2019): 744–63. http://dx.doi.org/10.1016/j.compfluid.2018.05.024.

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Binder, G. "Research on protective coating systems for immersed steel structures." Materials and Corrosion 52, no. 4 (April 2001): 261–67. http://dx.doi.org/10.1002/1521-4176(200104)52:4<261::aid-maco261>3.0.co;2-3.

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MEGE, Romain. "ICONE19-43307 Analytical solutions for the study of immersed unanchored structures under seismic loading." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_137.

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Uhlig, Manuel R., Simone Benaglia, Ravindra Thakkar, Jeffrey Comer, and Ricardo Garcia. "Atomically resolved interfacial water structures on crystalline hydrophilic and hydrophobic surfaces." Nanoscale 13, no. 10 (2021): 5275–83. http://dx.doi.org/10.1039/d1nr00351h.

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Більше джерел

Дисертації з теми "Immersed structures"

1

O'Connor, Joseph. "Fluid-structure interactions of wall-mounted flexible slender structures." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html.

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Анотація:
The fluid-structure interactions of wall-mounted slender structures, such as cilia, filaments, flaps, and flags, play an important role in a broad range of physical processes: from the coherent waving motion of vegetation, to the passive flow control capability of hair-like surface coatings. While these systems are ubiquitous, their coupled nonlinear response exhibits a wide variety of behaviours that is yet to be fully understood, especially when multiple structures are considered. The purpose of this work is to investigate, via numerical simulation, the fluid-structure interactions of arrays of slender structures over a range of input conditions. A direct modelling approach, whereby the individual structures and their dynamics are fully resolved, is realised via a lattice Boltzmann-immersed boundary model, which is coupled to two different structural solvers: an Euler-Bernoulli beam model, and a finite element model. Results are presented for three selected test cases - which build in scale from a single flap in a periodic array, to a small finite array of flaps, and finally to a large finite array - and the key behaviour modes are characterised and quantified. Results show a broad range of behaviours, which depend on the flow conditions and structural properties. In particular, the emergence of coherent waving motions are shown to be closely related to the natural frequency of the array. Furthermore, this behaviour is associated with a lock-in between the natural frequency of the array and the predicted frequency of the fluid instabilities. The original contributions of this work are: the development and application of a numerical tool for direct modelling of large arrays of slender structures; the characterisation of the behaviour of slender structures over a range of input conditions; and the exposition of key behaviour modes of slender structures and their relation to input conditions.
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2

Corti, Daniele Carlo. "Numerical methods for immersed fluid-structure interaction with enhanced interfacial mass conservation." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS176.

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Анотація:
Cette thèse porte sur la modélisation, l'analyse numérique et à la simulation de problèmes d'interaction fluide-structure pour des structures minces immergées dans un fluide visqueux incompressible. La motivation sous-jacente de ce travail est la simulation des phénomènes d'interaction fluide-structure impliqués dans la simulation des valves cardiaques. Du point de vue méthodologique, un accent particulier est mis sur des méthodes avec maillage non conformes qui permettent de garantir la précision du résultat en minimisant le coût computationnel. Un aspect essentiel est de garantir la conservation de la masse à travers l'interface fluide-structure. Une extension de la méthode de maillage non conforme Nitsche-XFEM présentée dans Alauzet et al. (2016) à trois dimensions est d'abord proposée, portant à la fois sur des domaines fluides entièrement et partiellement intersectés. Pour y parvenir, un algorithme de tessellation général et robuste a été développé sans recourir à des générateurs de maillage de type boîte noire. De plus, une nouvelle approche pour imposer la continuité dans des domaines partiellement intersectés est introduite. Cependant, dans les situations impliquant des phénomènes de contact avec de multiples interfaces, l'implémentation informatique devient extrêmement complexe, notamment en 3D. Ensuite, une méthode de domaine fictif innovante d'ordre inférieur est introduite, qui atténue les problèmes inhérents de conservation de la masse résultant de l'approximation continue de la pression en incorporant une seule contrainte de vitesse. Une analyse complète des erreurs a priori pour un problème de Stokes avec une contrainte de Dirichlet sur une interface immergée est fournie. Enfin, cette approche de domaine fictif est formulée dans un cadre d'interaction fluide-structure avec des solides minces et appliquée avec succès pour simuler la dynamique de la valve aortique
The present thesis is dedicated to the modeling, numerical analysis, and simu- lation of fluid-structure interaction problems involving thin-walled structures immersed in incompressible viscous fluid. The underlying motivation behind this work is the simulation of the fluid-structure interaction phenomena involved in cardiac valves. From a methodological standpoint, special focus is placed on unfitted mesh methods that guarantee accuracy without compromising computational complexity. An essential aspect is ensuring mass conservation across the fluid-structure interface. An extension of the unfitted mesh Nitsche-XFEM method reported in Alauzet et al. (2016) to three dimensions is first pro- posed, addressing both fully and partially intersected fluid domains. To achieve this, a robust general tessellation algorithm has been developed without relying on black-box mesh generators. Additionally, a novel approach for enforcing continuity in partially intersected domains is introduced. However, in situations involving contact phenomena with multiple interfaces, the computational implementation becomes exceedingly complex, particularly in 3D. Subsequently, an innovative low-order fictitious domain method is introduced, which mitigates inherent mass conservation issues arising from continuous pressure approximation by incorporating a single velocity constraint. A comprehensive a priori error analysis for a Stokes problem with a Dirichlet constraint on an immersed interface is provided. Finally, this fictitious domain approach is formulated within a fluid-structure interaction framework with general thin-walled solids and successfully applied to simulate the dynamics of the aortic valve
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3

Kara, Mustafa Can. "Fluid-structure interaction (FSI) of flow past elastically supported rigid structures." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51931.

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Анотація:
Fluid-structure interaction (FSI) is an important physical phenomenon in many applications and across various disciplines including aerospace, civil and bio-engineering. In civil engineering, applications include the design of wind turbines, pipelines, suspension bridges and offshore platforms. Ocean structures such as drilling risers, mooring lines, cables, undersea piping and tension-leg platforms can be subject to strong ocean currents, and such structures may suffer from Vortex-Induced Vibrations (VIV's), where vortex shedding of the flow interacts with the structural properties, leading to large amplitude vibrations in both in-line and cross-flow directions. Over the past years, many experimental and numerical studies have been conducted to comprehend the underlying physical mechanisms. However, to date there is still limited understanding of the effect of oscillatory interactions between fluid flow and structural behavior though such interactions can cause large deformations. This research proposes a mathematical framework to accurately predict FSI for elastically supported rigid structures. The numerical method developed solves the Navier-Stokes (NS) equations for the fluid and the Equation of Motion (EOM) for the structure. The proposed method employs Finite Differences (FD) on Cartesian grids together with an improved, efficient and oscillation-free Immersed Boundary Method (IBM), the accuracy of which is verified for several test cases of increasing complexity. A variety of two and three dimensional FSI simulations are performed to demonstrate the accuracy and applicability of the method. In particular, forced and a free vibration of a rigid cylinder including Vortex-Induced Vibration (VIV) of an elastically supported cylinder are presented and compared with reference simulations and experiments. Then, the interference between two cylinders in tandem arrangement at two different spacing is investigated. In terms of VIV, three different scenarios were studied for each cylinder arrangement to compare resonance regime to a single cylinder. Finally, the IBM is implemented into a three-dimensional Large-Eddy Simulation (LES) method and two high Reynolds number (Re) flows are studied for a stationary and transversely oscillating cylinder. The robustness, accuracy and applicability of the method for high Re number flow is demonstrated by comparing the turbulence statistics of the two cases and discussing differences in the mean and instantaneous flows.
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Leone, Giada <1995&gt. "The production of dative structures in Italian English-immersed late bilinguals: a comparative study on Language Attrition." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/22026.

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Анотація:
While studies have focused on the impact of a L1 on a L2, less is known about dominant language transfer in L1 productions. This study aims at investigating first language (L1) attrition in Italian English-immersed late bilinguals. These bilinguals have learnt an additional language in adulthood and have been living in this language environment for an extended period of time. More precisely, the population of this study consisted in a group of Italians (n = 42) who have been living abroad for at least 5 years (English-immersed Participants). Data was also collected from a group of Italian L1 - English L2 late bilinguals in Italy (n = 24) with advanced levels of English proficiency (Controls). Native Language Attrition refers to situations where the speaker of a language experiences a gradual decrease of L1 performance, and this is not caused by a deterioration of the brain (e.g., due to age, illness or injury) but triggered by disuse, and pressure from another language due to a change of the linguistic environment (Schmid, 2008). Changes occurring at a cognitive level due to L1-L2 interaction patterns in bilingual minds suggest high plasticity of the brain and a strong adaptability of brain structures, even in the case of fully acquired L1s. We use a cross-linguistic Structural Priming task to investigate the production of Datives (8 Double Objects (DOs), 8 Prepositional Datives (PDs)) in both English-immersed Participants and Controls. Whereas English allows two alternative constructions to express the meaning of a ditransitive event, namely DOs (e.g., The girl gave the teacher a flower) and PDs (e.g., The girl gave a flower to the teacher), in Italian, the DO option is unlicenced and its use would yield an ungrammatical sentence. Italian does allow a dispreferred construction (Shifted PD) where the PD recipient immediately follows the verb. We predict that when primed with DO structures in English, Italian participants may resort to this construction. Participants were presented with a written English prime and asked to read it aloud before being recorded describing a target picture in Italian. The same verbs were kept between Prime and Target, and DO- PD-biases were manipulated (Gries & Stefanowitsch, 2004). This study attempts to answer the following questions: To what extent can cross-language interference lead to a change of L1 syntactic structures due to the phenomenon of Language Attrition? That is to say, can cross-linguistic Structural Priming be observed with language-specific syntactic structures not shared between languages? What role do environmental factors play on the phenomenon of L1 attrition? In other words, are there differences in the production of dative structures in people who claim to be L2 dominant? The following factors were considered to modulate the degree of attrition within the group of L2-immersed late bilinguals: length of residence in the L2 environment, L2 proficiency, and degree of L2 exposure in familiar and work environments. Higher levels of these factors were expected to have a positive correlation with the degree of L1 attrition. This study provides further evidence of cross-linguistic influence and L1 attrition in L2-immersed late bilinguals, supporting and extending previous studies on complex morphosyntactic structures. The different results obtained from the two groups provide evidence of language change even in individuals with fully acquired L1 grammars, given high degrees of L2 immersion and reduced use of the L1.
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5

Pepona, Marianna. "Modèle de frontières immergées pour la simulation d'écoulements de fluide en interaction avec des structures poreuses." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4349/document.

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Анотація:
Un large spectre d’applications en ingénierie est concerné par les écoulements de fluides en interaction avec des structures poreuses, allant de problèmes à petite échelle jusqu’à des problématiques de plus grande échelle. Ces structures poreuses, souvent à géométries complexes, peuvent se déplacer ou se déformer en réponse au forçage exercé par l’écoulement environnant.Le but de ce travail est de proposer un modèle numérique pour la simulation macroscopique d’écoulements de fluide interagissant avec des milieux poreux mobiles à géométries complexes, qui soit facile d’implémentation et pouvant être utilisé dans une large gamme d’applications. Pour atteindre cet objectif, la méthode de Lattice Boltzmann est utilisée pour résoudre l’écoulement dans des milieux poreux à l’échelle d’un volume représentatif élémentaire. Pour l’implémentation du mouvement désiré, le concept de frontières immergées est adopté. Dans ce contexte, un nouveau modèle est proposé pour traiter des milieux poreux en volume, dont la résistance à l’écoulement environnant est modélisé par la loi de Brinkman-Forchheimer-Darcy étendue.L’algorithme est d’abord testé sur l’écoulement à travers un cylindre fixe. La simplicité de ce cas test académique permet de caractériser finement la précision de la méthode. Le modèle est ensuite utilisé pour simuler des écoulements de fluide autour et à travers des corps poreux mobiles, à la fois pour des géométries confinées et pour des écoulements ouverts. L’invariance Galiléenne des équations moyennées macroscopiques gouvernant la dynamique du fluide est démontrée. D’excellents accords avec les résultats de référence sont obtenus pour les différents cas testés
A wide spectrum of engineering problems is concerned with fluid flows in interaction with porous structures, ranging from small length-scale problems to large ones. These structures, often of complex geometry, may move/deform in response to the forces exerted by the surrounding flow. Despite the advancements in computational fluid dynamics, the numerical simulation of such configurations - a valuable tool for the study of the flow physics involved - remains a challenging task.The aim of the present work is to propose a numerical model for the macroscopic simulation of fluid flows interacting with moving porous media of complex geometry, that is easy to implement and can be used in a range of applications. To achieve this, the Lattice Boltzmann method is employed for solving the flow in porous media at the representative elementary volume scale. For the implementation of the desired body motion, the concept of the Immersed Boundary method is adopted. In this context, a novel model is proposed for dealing with moving volumetric porous media, whose resistance to the surrounding flow obeys the Brinkman-Forchheimer-extended Darcy law. The algorithm is initially tested for flow past a static cylinder. The simplicity of this academic test case allows us to assess in detail the accuracy of the proposed method. The model is later used to simulate fluid flows around and through moving porous bodies, both in a confined geometry and in open space. We are able to demonstrate the Galilean invariance of the macroscopic volume-averaged flow governing equations. Excellent agreement with reference results is obtained in all cases
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Nasar, Abouzied. "Eulerian and Lagrangian smoothed particle hydrodynamics as models for the interaction of fluids and flexible structures in biomedical flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/eulerian-and-lagrangian-smoothed-particle-hydrodynamics-as-models-for-the-interaction-of-fluids-and-flexible-structures-in-biomedical-flows(507cd0db-0116-4258-81f2-8d242e8984fa).html.

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Анотація:
Fluid-structure interaction (FSI), occurrent in many areas of engineering and in the natural world, has been the subject of much research using a wide range of modelling strategies. However, problems with high levels of structural deformation are difficult to resolve and this is particularly the case for biomedical flows. A Lagrangian flow model coupled with a robust model for nonlinear structural mechanics seems a natural candidate since large distortion of the computational geometry is expected. Smoothed particle Hydrodynamics (SPH) has been widely applied for nonlinear interface modelling and this approach is investigated here. Biomedical applications often involve thin flexible structures and a consistent approach for modelling the interaction of fluids with such structures is also required. The Lagrangian weakly compressible SPH method is investigated in its recent delta-SPH form utilising inter-particle density fluxes to improve stability. Particle shifting is also used to maintain particle distributions sufficiently close to uniform to enable stable computation. The use of artificial viscosity is avoided since it introduces unphysical dissipation. First, solid boundary conditions are studied using a channel flow test. Results show that when the particle distribution is allowed to evolve naturally instabilities are observed and deviations are noted from the expected order of accuracy. A parallel development in the SPH group at Manchester has considered SPH in Eulerian form (for different applications). The Eulerian form is applied to the channel flow test resulting in improved accuracy and stability due to the maintenance of a uniform particle distribution. A higher-order accurate boundary model is developed and applied for the Eulerian SPH tests and third-order convergence is achieved. The well documented case of flow past a thin plate is then considered. The immersed boundary method (IBM) is now a natural candidate for the solid boundary. Again, it quickly becomes apparent that the Lagrangian SPH form has limitations in terms of numerical noise arising from anisotropic particle distributions. This corrupts the predicted flow structures for moderate Reynolds numbers (O(102)). Eulerian weakly compressible SPH is applied to the problem with the IBM and is found to give accurate and convergent results without any numerical stability problems (given the time step limitation defined by the Courant condition). Modelling highly flexible structures using the discrete element model is investigated where granular structures are represented as bonded particles. A novel vector-based form (the V-Model) is identified as an attractive approach and developed further for application to solid structures. This is shown to give accurate results for quasi-static and dynamic structural deformation tests. The V-model is applied to the decay of structural vibration in a still fluid modelled using Eulerian SPH with no artificial stabilising techniques. Again, results are in good agreement with predictions of other numerical models. A more demanding case representative of pulsatile flow through a deep leg vein valve is also modelled using the same form of Eulerian SPH. The results are free of numerical noise and complex FSI features are captured such as vortex shedding and non-linear structural deflection. Reasonable agreement is achieved with direct in-vivo observations despite the simplified two-dimensional numerical geometry. A robust, accurate and convergent method has thus been developed, at present for laminar two-dimensional low Reynolds number flows but this may be generalised. In summary a novel robust and convergent FSI model has been established based on Eulerian SPH coupled to the V-Model for large structural deformation. While these developments are in two dimensions the method is readily extendible to three-dimensional, laminar and turbulent flows for a wide range of applications in engineering and the natural world.
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Sidibé, Yaya Yannick. "Aide à la décision pour la détection et l’analyse des défauts de surface dans les structures immergées." Thesis, Le Havre, 2015. http://www.theses.fr/2015LEHA0006/document.

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Анотація:
Cette thèse concerne le développement de méthodes de détection et de diagnostic des défauts de surface dans les structures immergées. Les structures étudiées sont formées de plaques métalliques. Les méthodes proposées sont basées sur une analyse de mesures acoustiques ultrasonores issues d’échographie sous-marine. Cette analyse combine des outils usuels du traitement du signal et des méthodes de classification à base de réseaux de neurones gaussiens. Des variantes avec et sans modèle de référence sont proposées. Les techniques usuelles d’évaluation par contact montrent leurs limites pour le diagnostic des structures telles que les hydroliennes. Le présent travail de recherche consiste à utiliser un seul et unique transducteur sans contact sous différents angles contrairement à d’autres techniques qui nécessitent un grand nombre de capteurs et une connaissance précise de leur positionnement. Notre étude utilise les ondes de Lamb car elles sont très sensibles aux anomalies structurelles. Les principales étapes et outils utilisés sont les suivants : - 1. Utilisation d’un dispositif de génération et d’acquisition d’ondes de Lamb. - 2. Étude de la propagation d’ondes de Lamb dans les structures en immersion, en particulier dans les plaques métalliques immergées dans l’eau. - 3. Caractérisation des signaux pour différents types de défauts. - 4. Estimation de l’angle d’acquisition et de la distance du transducteur par rapport au centre de la plaque
This study concerns the damages detection and diagnosis for immersed structure. The structures are metallic plates. The proposed method focuses on the analysis of ultrasonic acoustic measurements obtained by submarine echography. It combines signal processing tools and Gaussian neural networks for classification purpose. Methods with and without reference models are proposed. The usual detection technics with contact are not applicable for the considered systems like stream turbines. This research consists to use a single and a single transducer under different incidence angles opposed to others technics using numerous sensors and their accurate location. The present research use Lamb wave according to their sensibility to the structural damages. The different stages are the following : - 1. Experimental setup for Lamb wave generation and acquisition. - 2. Study of the Lamb wave processing on immersed structures, in particular in metallic plate immersed in water. - 3 .Signal characterization for different types of damages. - 4. Estimation of the angle and lift-off distance
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8

Benyo, Krisztian. "Analyse mathématique de l’interaction d’un fluide non-visqueux avec des structures immergées." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0156/document.

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Анотація:
Cette thèse porte sur l’analyse mathématique de l’interaction d’un fluide non-visqueux avec des structures immergées. Plus précisément, elle est structurée autour de deux axes principaux. L’un d’eux est l’analyse asymptotique du mouvement d’une particule infinitésimale en milieu liquide. L’autre concerne l’interaction entre des vagues et une structure immergée. La première partie de la thèse repose sur l’analyse mathématique d’un système d’équations différentielles ordinaires non-linéaires d’ordre 2 modélisant le mouvement d’un solide infiniment petit dans un fluide incompressible en 2D. Les inconnues du modèle décrivent la position du solide, c’est-à-dire la position du centre de masse et son angle de rotation. Les équations proviennent de la deuxième loi de Newton avec un prototype de force de type Kutta-Joukowski. Plus précisément, nous étudions la dynamique de ce système lorsque l’inertie du solide tend vers 0. Les principaux outils utilisés sont des développements asymptotiques multiéchelles en temps. Pour la dynamique de la position du centre de masse, l’étude met en évidence des analogies avec le mouvement d’une particule chargée dans un champ électromagnétique et la théorie du centre-guide. En l’occurrence, le mouvement du centreguide est donné par une équation de point-vortex. La dynamique de l’angle est quant à elle donnée par une équation de pendule non-linéaire lentement modulée. Des régimes très différents se distinguent selon les données initiales. Pour de petites vitesses angulaires initiales la méthode de Poincaré-Lindstedt fait apparaitre une modulation des oscillations rapides, alors que pour de grandes vitesses angulaires initiales, un movement giratoire bien plus irrégulier est observé. C’est une conséquence particulière et assez spectaculaire de l’enchevêtrement des trajectoires homocliniques. La deuxième partie de la thèse porte sur le problème des vagues dans le cas où le domaine occupé par le fluide est à surface libre et avec un fond plat sur lequel un objet solide se translate horizontalement sous l’effet des forces de pression du fluide. Nous avons étudié deux systèmes asymptotiques qui décrivent le cas d’un fluide parfait incompressible en faible profondeur. Ceux-ci correspondent respectivement aux équations de Saint-Venant et de Boussinesq. Grâce à leur caractère bien-posé en temps long, les modèles traités permettent de prendre en compte certains effets de la mécanique du solide, comme les forces de friction, ainsi que les effets non-hydrostatiques. Notre analyse théorique a été complétée par des études numériques. Nous avons développé un schéma de différences finies d’ordre élevé et nous l’avons adapté à ce problème couplé afin de mettre en évidence les effets d’un solide (dont le mouvement est limité à des translations sur le fond) sur les vagues qui passent au dessus de lui. A la suite de ces travaux, nous avons souligné l’influence des forces de friction sur ce genre de systèmes couplés ainsi que sur le déferlement des vagues. Quant à l’amortissement dû aux effets hydrodynamiques, une vague ressemblance avec le phénomène de l’eau morte est mise en évidence
This PhD thesis concerns the mathematical analysis of the interaction of an inviscid fluid with immersed structures. More precisely it revolves around two main problems: one of them is the asymptotic analysis of an infinitesimal immersed particle, the other one being the interaction of water waves with a submerged solid object. Concerning the first problem, we studied a system of second order non-linear ODEs, serving as a toy model for the motion of a rigid body immersed in a two-dimensional perfect fluid. The unknowns of the model describe the position of the object, that is the position of its center of mass and the angle of rotation; the equations arise from Newton’s second law with the consideration of a Kutta-Joukowski type lift force. It concerns the detailed analysis of the dynamic of this system when the solid inertia tends to 0. For the evolution of the position of the solid’s center of mass, the study highlights similarities with the motion of a charged particle in an electromagnetic field and the wellknown “guiding center approximation”; it turns out that the motion of the corresponding guiding center is given by a point-vortex equation. As for the angular equation, its evolution is given by a slowly-in-time modulated non-linear pendulum equation. Based on the initial values of the system one can distinguish qualitatively different regimes: for small angular velocities, by the Poincaré-Lindstedt method one observes a modulation in the fast time-scale oscillatory terms, for larger angular velocities however erratic rotational motion is observed, a consequence of Melnikov’s observations on the presence of a homoclinic tangle. About the other problem, the Cauchy problem for the water waves equations is considered in a fluid domain which has a free surface on the upper vertical limit and a flat bottom on which a solid object moves horizontally, its motion determined by the pressure forces exerted by the fluid. Two shallow water asymptotic regimes are detailed, well-posedness results are obtained for both the Saint-Venant and the Boussinesq system coupled with Newton’s equation characterizing the solid motion. Using the particular structure of the coupling terms one is able to go beyond the standard scale for the existence time of solutions to the Boussinesq system with a moving bottom. An extended numerical study has also been carried out for the latter system. A high order finite difference scheme is developed, extending the convergence ratio of previous, staggered grid based models. The discretized solid mechanics are adapted to represent important features of the original model, such as the dissipation due to the friction term. We observed qualitative differences for the transformation of a passing wave over a moving solid object as compared to an immobile one. The movement of the solid not only influences wave attenuation but it affects the shoaling process as well as the wave breaking. The importance of the coefficient of friction is also highlighted, influencing qualitative and quantitative properties of the coupled system. Furthermore, we showed the hydrodynamic damping effects of the waves on the solid motion, reminiscent of the so-called dead water phenomenon
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9

Boilevin-Kayl, Ludovic. "Modeling and numerical simulation of implantable cardiovascular devices." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS039.

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Cette thèse, réalisée dans le cadre du projet Mivana, est consacrée à la modélisation et à la simulation numérique de dispositifs cardiaques implantables. Ce projet est mené par les start-up Kephalios et Epygon, concepteurs de solutions chirurgicales non invasives pour le traitement de la régurgitation mitrale. La conception et la simulation de tels dispositifs nécessitent des méthodes numériques efficaces et précises capables de calculer correctement l’hémodynamique cardiaque. C’est le but principal de cette thèse. Dans la première partie, nous décrivons le système cardiovasculaire et les valves cardiaques avant de présenter quelques éléments de théorie concernant la modélisation mathématique de l’hémodynamique cardiaque. En fonction du degré de complexité adopté pour la modélisation des feuillets de la valve, deux approches sont identifiées : le modèle de surfaces résistives immergées et le modèle complet d’interaction fluide-structure. Dans la deuxième partie, nous étudions la première approche qui consiste à combiner une modélisation réduite de la dynamique des valves avec un découplage cinématique de l’hémodynamique cardiaque et de l’électromécanique. Nous l’enrichissons de données physiologiques externes pour la simulation correcte des phases isovolumétriques, pierres angulaires du battement cardiaque, permettant d’obtenir un modèle relativement précis qui évite la complexité des problèmes entièrement couplés. Ensuite, une série d’essais numériques sur des géométries 3D physiologiques, impliquant la régurgitation mitrale et plusieurs configurations de valves immergées, illustre la performance du modèle proposé. Dans la troisième et dernière partie, des modèles complets d’interaction fluide-structure sont considérés. Ce type de modélisation est nécessaire pour étudier des problèmes plus complexes où la précédente approche n’est plus satisfaisante, comme par exemple le prolapsus de la valve mitrale ou la fermeture d’une valve mécanique. D’un point de vue numérique, le développement de méthodes précises et efficaces est indispensable pour pouvoir simuler de tels cas physiologiques. Nous considérons alors une étude numérique complète dans laquelle plusieurs méthodes de maillages non compatibles sont comparées. Puis, nous présentons un nouveau schéma de couplage explicite dans le cadre d’une méthode de type domaine fictif pour lequel la stabilité inconditionnelle au sens de la norme en énergie est démontrée. Plusieurs exemples numériques en 2D sont proposés afin d’illustrer les propriétés et les performances de ce schéma. Enfin, cette méthode est finalement utilisée pour la simulation numérique 2D et 3D de dispositifs cardiovasculaires implantables dans un modèle complet d’interaction fluide-structure
This thesis, taking place in the context of the Mivana project, is devoted to the modeling and to the numerical simulation of implantable cardiovascular devices. This project is led by the start-up companies Kephalios and Epygon, conceptors of minimally invasive surgical solutions for the treatment of mitral regurgitation. The design and the simulation of such devices call for efficient and accurate numerical methods able to correctly compute cardiac hemodynamics. This is the main purpose of this thesis. In the first part, we describe the cardiovascular system and the cardiac valves before presenting some standard material for the mathematical modeling of cardiac hemodynamics. Based on the degree of complexity adopted for the modeling of the valve leaflets, two approaches are identified: the resistive immersed surfaces model and the complete fluidstructure interaction model. In the second part, we investigate the first approach which consists in combining a reduced modeling of the valves dynamics with a kinematic uncoupling of cardiac hemodynamics and electromechanics. We enhance it with external physiological data for the correct simulation of isovolumetric phases, cornerstones of the heartbeat, resulting in a relatively accurate model which avoids the complexity of fully coupled problems. Then, a series of numerical tests on 3D physiological geometries, involving mitral regurgitation and several configurations of immersed valves, illustrates the performance of the proposed model. In the third and final part, complete fluid-structure interaction models are considered. This type of modeling is necessary when investigating more complex problems where the previous approach is no longer satisfactory, such as mitral valve prolapse or the closing of a mechanical valve. From the numerical point of view, the development of accurate and efficient methods is mandatory to be able to compute such physiological cases. We then consider a complete numerical study in which several unfitted meshes methods are compared. Next, we present a new explicit coupling scheme in the context of the fictitious domain method for which the unconditional stability in the energy norm is proved. Several 2D numerical examples are provided to illustrate the properties and the performance of this scheme. Last, this method is finally used for 2D and 3D numerical simulation of implantable cardiovascular devices in a complete fluid-structure interaction framework
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10

Yang, Liang. "An immersed computational framework for multiphase fluid-structure interaction." Thesis, Swansea University, 2015. https://cronfa.swan.ac.uk/Record/cronfa42413.

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The objective of this thesis is to further extend the application range of immersed computational approaches in the context of hydrodynamics and present a novel general framework for the simulation of fluid-structure interaction problems involving rigid bodies, flexible solids and multiphase flows. The proposed method aims to overcome shortcomings such as the restriction of having to deal with similar density ratios among different phases or the restriction to solve single-phase flows. The new framework will be capable of coping with large density ratios, multiphase flows and will be focussed on hydrodynamic problems. The two main challenges to be addressed are: - the representation, evolution and compatibility of the multiple fluid-solid interface - the proposition of unified framework containing multiphase flows, flexible structures and rigid bodies with possibly large density ratios First, a new variation of the original IBM is presented by rearranging the governing equations which define the behaviour of the multiple physics involved. The formulation is compatibile with the "one-fluid" equation for two phase flows and can deal with large density ratios with the help of an anisotropic Poisson solver. Second, deformable structures and fluid are modelled in a identical manner except for the deviatoric part of the Cauchy stress tensor. The challenging part is the calculation of the deviatoric part the Cauchy stress in the structure, which is expressed as a function of the deformation gradient tensor. The technique followed In this thesis is that original ISP, but re-expressed in terms of the Cauchy stress tensor. Any immersed rigid body is considered as an incompressible non-viscous continuum body with an equivalent internal force field which constrains the velocity field to satisfy the rigid body motion condition. The "rigid body" spatial velocity is evaluated by means of a linear least squares projection of the background fluid velocity, whilst the immersed force field emerges as a result of the linear momentum conversation equation. This formulation is convenient for arbitrary rigid shapes around a fixed point and the most general translation- rotation. A characteristic or indicator function, defined for each interacting continuum phase, evolves passively with the velocity field. Generally, there are two families of algorithms for the description of the interfaces, namely, Eulerian grid based methods (interface tracking). In this thesis, the interface capturing Level Set method is used to capture the fluid-fluid interface, due to its advantages to deal with possible topological changes. In addiction, an interface tracking Lagrangian based meshless technique is used for the fluid-structure interface due to its benefits at the ensuring mass preservation. From the fluid discretisation point of view, the discretisation is based on the standard Marker-and-Cell method in conjunction with a fractional step approach for the pressure/velocity decoupling. The thesis presents a wide range of applications for multiphase flows interacting with a variety of structures (i.e. rigid and deformable) Several numerical examples are presented in order to demonstrate the robustness and applicability of the new methodology.
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Книги з теми "Immersed structures"

1

Gustafson, Curt. Modified abrasive blast/chemical stabilizer admixtures for deleading immersed steel structures coated with lead-based paint. [Champaign, IL]: US Army Corps of Engineers, Construction Engineering Research Laboratories, 1997.

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2

Rainey, R. C. T. Breaking Wave Loads on Immersed Members of Offshore Structures. Stationery Office Books, 1991.

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3

Immersed Tunnels. CRC Press, 2013.

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4

Lunniss, Richard, and Jonathan Baber. Immersed Tunnels. Taylor & Francis Group, 2013.

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5

Lunniss, Richard. Immersed Tunnels. Taylor & Francis Group, 2013.

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6

Lunniss, Richard, and Jonathan Baber. Immersed Tunnels. Taylor & Francis Group, 2013.

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7

Lunniss, Richard, and Jonathan Baber. Immersed Tunnels. Taylor & Francis Group, 2017.

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8

Lunniss, Richard, and Jonathan Baber. Immersed Tunnels. Taylor & Francis Group, 2013.

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9

Lunniss, Richard, and Jonathan Baber. Immersed Tunnels. Taylor & Francis Group, 2013.

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10

Netter, Louis. Reportage Drawing. Bloomsbury Publishing Plc, 2023. http://dx.doi.org/10.5040/9781350253124.

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How does drawing shape the truth and our understanding of the visual world? Why has the act of reportage drawing persisted and thrived in our ever-changing media landscape? This book offers a deep dive into the world of reportage drawing, a world which is provocative, mixed media, transdisciplinary and immersed in the idiosyncratic vision of the artist. Where the traditional orientation of reportage was on the communicative function of the image as a record of an event, contemporary practitioners, largely detached from the commissioning structures of the 19th and 20th centuries, now seek to capture more experiential qualities of place and choose locations which have highly personal and political significance. Liberated from old conceptions of reportage drawing as objective and true, artists today embrace subjectivity and are seeking a rich dialogue with their subjects, using drawing to tell important stories about protest, human migration, war, corporate capitalism and homelessness. Louis Netter distinguishes contemporary reportage drawing from its historical function through a critical exploration of the aesthetic of the sketch, the role of caricature and the nature of experience. Featuring several prominent artists such as Jill Gibbon, who secretly draws in arms fairs across Europe, renowned reportage illustrator Gary Embury and French reportage artist Loup Blaster, in addition to an exploration of the author’s own work, this book shows how the act of drawing can foster new insights about people, places and political realities in often subtle and challenging ways. Part of the Drawing In series, this book opens up reportage drawing practice as a way of understanding our world in a deeper and more personal way.
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Частини книг з теми "Immersed structures"

1

Cui, Zhen-Dong, Zhong-Liang Zhang, Li Yuan, Zhi-Xiang Zhan, and Wan-Kai Zhang. "Design of Immersed Tube Structures." In Design of Underground Structures, 553–92. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7732-7_13.

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2

Xu, Guoping, Qingfei Huang, Shenyou Song, Hai Ji, Bin Deng, and Tian Song. "Research on Mechanical Properties of Steel Shell Concrete Immersed Tube Shear Connectors." In Advances in Frontier Research on Engineering Structures, 295–312. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_27.

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AbstractStructural designs of shear connector in immersed tunnel is one of the most significant key technical problems in tunnel designing. According to investigations conducted in Shenzhong Link project, this paper combined numerical simulation methods and experimental verifications and to research effects of shear connector void, stress state, and opening holes on performances of steel–concrete connectors, and also discussed differences of shear slip curves under the influence of factors above, as well as impacts on bearing capacities and stiffnesses of connectors. Through numerical simulations of void and non-void connectors by finite element method, patterns of concrete stress, connector behaviors under tension and compression and shear stresses were analyzed respectively. Additionally, reductions of bearing capacity and stiffness caused by voids and openings which were controlled as variables were discussed. Furthermore, a calculation formula of shear connector bearing capacity is proposed which is in consistent with experimental verifications with considerations of void, stress state and opening. Researches in this paper could provide knowledge for reasonable structural designs of structural connectors in future immersed tunnel engineering construction.
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Pistone, Elisabetta, Piervincenzo Rizzo, and Paul Werntges. "Bulk Waves for the Nondestructive Inspection of Immersed Structures." In Experimental and Applied Mechanics, Volume 6, 643–49. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0222-0_76.

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4

Huang, Dongqing, Yongfang Shen, Zhuo Cheng, and Zhaowei Wang. "Technology research and application of immersed tunnel underwater detection." In Advances in Frontier Research on Engineering Structures Volume 1, 682–89. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003336631-101.

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5

Roy, Priyanka, Subhasish Das, Anupama Dey, and Rajib Das. "Analytical Study of Scour Mechanism Around Immersed Rectangular Vane Structures." In Lecture Notes in Civil Engineering, 703–17. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4629-4_49.

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6

Li, Bangxu, and Yatong Chen. "Research on isometric model test of sand foundation of immersed tunnel." In Advances in Frontier Research on Engineering Structures Volume 1, 690–97. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003336631-102.

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7

Boyd-Weetman, B., P. Thomas, P. DeSilva, and V. Sirivivatnanon. "Accelerated Mortar Bar Test to Assess the Effect of Alkali Concentration on the Alkali–Silica Reaction." In Lecture Notes in Civil Engineering, 233–39. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_24.

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AbstractWe report the outcomes of a study into the influence of alkali concentration on expansion induced by the alkali–silica reaction (ASR), a deleterious reaction that causes cracking and durability loss in concrete structures. We assessed the effect of alkali concentration on mortar bar expansion using a modified form of AS1141.60.1, the accelerated mortar bar test (AMBT). Mortar prisms were prepared with a reactive aggregate and immersed in alkali solutions of varying concentrations (from 0.4 to 1.0 M NaOH) and saturated limewater at 80 °C. Expansion was monitored for 28 days. The degree of expansion was observed to increase with increasing alkali concentration and an induction period prior to expansion was observed for the 0.4 M NaOH. No expansion was observed for mortar bars immersed in the control saturated lime water bath. Additionally, no expansion was observed for mortars using blended cements containing fly ash (FA) and ground granulated blast furnace slag, suggesting the AMBT is a viable technique for demonstrating the efficacy of mitigation strategies.
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8

Zeroug, Smaine, and Leopold B. Felsen. "Non-Specular Reflection of Bounded Beams From Multilayer Fluid-Immersed Elastic Structures: Complex Ray Method Revisited." In Review of Progress in Quantitative Nondestructive Evaluation, 129–36. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3344-3_16.

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9

Yücel, Hazel, Barış Erbaş, Nihal Ege, and Julius Kaplunov. "The Lowest Eigenfrequencies of an Immersed Thin Elastic Cylindrical Shell." In Advanced Structured Materials, 559–71. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-43210-1_31.

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10

Verhoosel, Clemens V., E. Harald van Brummelen, Sai C. Divi, and Frits de Prenter. "Scan-Based Immersed Isogeometric Flow Analysis." In Frontiers in Computational Fluid-Structure Interaction and Flow Simulation, 477–512. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-36942-1_14.

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Тези доповідей конференцій з теми "Immersed structures"

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Aono, Toshio, Koushi Sumida, Ryuichi Fujiwara, Akiyuki Ukai, Kazuhiro Yamamura, and Yukio Nakaya. "Rapid Stabilization of the Immersed Tunnel Element." In Coastal Structures 2003. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40733(147)33.

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2

Reichel, Erwin K., and Bernhard Jakoby. "Acoustic streaming driven by immersed resonator structures." In 2015 IEEE Sensors. IEEE, 2015. http://dx.doi.org/10.1109/icsens.2015.7370390.

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3

Travasarou, Thaleia, Jacob Chacko, Weiyu Chen, and Alfredo Fernandez. "Assessment of Liquefaction-Induced Hazards for Immersed Structures." In Offshore Technology Conference. Offshore Technology Conference, 2012. http://dx.doi.org/10.4043/23409-ms.

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4

Pistone, Elisabetta, Abdollah Bagheri, Kaiyuan Li, and Piervincenzo Rizzo. "Signal processing for the inspection of immersed structures." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Tribikram Kundu. SPIE, 2013. http://dx.doi.org/10.1117/12.2008894.

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5

de Rosa, Donato, Francesco Capizzano, and Davide Cinquegrana. "Multi-step Ice Accretion by Immersed Boundaries." In International Conference on Icing of Aircraft, Engines, and Structures. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1484.

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<div class="section abstract"><div class="htmlview paragraph">The paper describes a tools’ suite able of analyzing numerically 3D ice-accretion problems of aeronautical interest. The methodology consists of linking different modules each of them performing a specific function inside the ice-simulation chain. It has been specifically designed from the beginning with multi-step capability in mind. Such a feature plays a key role when studying the dynamic evolution of the icing process. Indeed, the latter has the character of a multi-physic and time-dependent phenomenon which foresees a strong interaction of the air- and water fields with the wall thermodynamics.</div><div class="htmlview paragraph">Our multi-layer approach assumes that the physical problem can be discretized by a series of pseudo-steady conditions. The simulation process starts with the automatic generation of a Cartesian three-dimensional mesh which represents the input for the immersed boundary (IB) RANS solver. Once obtained, the air-phase is used by the Eulerian tool to solve the transport of the water-phase on the same domain-grid. Both the volumetric solvers share the same unstructured data management and the finite-volume (FV) approach which is based on locally refined Cartesian meshes.</div><div class="htmlview paragraph">Part of the research effort is devoted to the development of a thermodynamic 3D method which solves the surface liquid-film by Messinger balances of mass and energy. The main outputs are the equilibrium temperature and the mass of ice. The latter is used to compute the local ice-height for accretion purposes. A Lagrangian modification of the geometry is applied at each step by moving the wall vertices along the local unit normal vector. The modified 3D surface is passed again to the automatic mesher for renewing the computational loop. The accuracy and the limits of the present method are discussed by analyzing the results on three-dimensional benchmarks proposed in the framework of the 1st ice prediction workshop (IPW).</div></div>
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6

Rodrigues, Eduardo. "Nonlinear Modeling of the Typical Section Immersed in Subsonic Flow." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1735.

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7

Baque, F., K. Paumel, G. Corneloup, M. A. Ploix, and J. M. Augem. "Non destructive examination of immersed structures within liquid sodium." In 2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA). IEEE, 2011. http://dx.doi.org/10.1109/animma.2011.6172879.

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8

Borza, Dan, Abderahman Makloufi, and Abdelkhalak El Hami. "Holographic vibration measurement and numerical modelling of immersed structures." In Speckle06: Speckles, From Grains to Flowers, edited by Pierre Slangen and Christine Cerruti. SPIE, 2006. http://dx.doi.org/10.1117/12.695488.

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Qin, Zhanming, Liviu Librescu, Davresh Hasanyan, and Damodar Ambur. "Circular Cylindrical Shells Immersed in a Magnetic Field: Modeling and Dynamic Behavior." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1690.

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10

Bhatia, Manav. "h-Adaptive Immersed-Boundary Topology Optimization of Nonlinear Thermoelastic Structures." In AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-1891.

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Звіти організацій з теми "Immersed structures"

1

Guo, Yu-Tao, Jian-Sheng Fan, and Jian-Guo Nie. THE NEW TREND OF COMPARTMENT STEEL-CONCRETE-STEEL COMPOSITE STRUCTURES IN IMMERSED TUNNELS. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.100.

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2

Gustafson, Curt, and Vincent F. Hock. Modified Abrasive Blast/Chemical Stabilizer Admixtures for Deleading Immersed Steel Structures Coated With Lead-Based Paint. Fort Belvoir, VA: Defense Technical Information Center, November 1997. http://dx.doi.org/10.21236/ada333765.

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3

Chen, Weile, Shenyou Song, Wenliang Jin, Yuqing Liu, and Yongxuan Li. LATERAL STATIC ANALYSIS ON STEEL-CONCRETE-STEEL COMPOSITE STRUCTURE IN IMMERSED TUNNEL OF SHENZHEN-ZHONGSHAN LINK. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.088.

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4

EXPERIMENTAL INVESTIGATION ON THE STRUCTURAL BEHAVIOR OF CORRODED SELF-DRILLING SCREW CONNECTIONS IN COLD-FORMED STEEL STRUCTURES. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.229.

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Анотація:
"Cold-formed steel (CFS) self-drilling screw connections are popular in the construction industry due to rapid fastening and ease of installation. However, the corrosion damage of CFS structures can significantly reduce mechanical properties, affecting the safety and durability of such structures. Therefore, this research investigates the effect of corrosion on the behavior of CFS connections experimentally. This paper presents a total of 36 new experiments on different types of CFS self-drilling screws (12 and 14 gauge) and steel sheet thickness (2.5 mm). Half of the tests were for corroded specimens, and the remaining half were for non-corroded specimens. Further, one to two screws per arrangement connecting the steel sheets with a yield strength of 450MPa were tested. Screws were immersed for 31 days, and the CFS plates were immersed for 8 weeks in a corrosion chamber before the tests were conducted. The experimental tests found that the shear strength of single-screw and double-screw specimens was reduced by 43%, on average for all investigated screw series."
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5

EXPERIMENTAL STUDY ON WELDING RESIDUAL STRESS OF TWO-WAY STIFFENED STEEL PLATES. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.531.

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Анотація:
The immersed tunnel of Shenzhen-Zhongshan Link Project adopts the steel shell-concrete (SSC) composite structure, in which the two-way stiffened steel plate is applied as the surface of steel shell. Since the steel plate stiffened in two-way, the residual stresses could be induced in the complicated welds at the intersections of plates and stiffeners. Therefore, residual stress experimental study on two full-scale specimen of the two-way stiffened steel plate, based on the steel shell details of ShenzhenZhongshan Link Project, was carried out to investigate the distribution of residual stresses by sectioning method. Results show that tensile residual stress could be measured near the welded stiffeners with a maximum of about 0.66 times the yield strength. While the compressive residual stress is between the stiffeners, with a maximum of about 0.35 times the yield strength. Furthermore, in the direction of welded T-shape stiffeners, the difference values between residual stresses of inner and outer surfaces on bottom plates is smaller than that in the direction of welded plate stiffeners, with maximum values of 0.09 times and 0.22 times the yield strength, respectively.
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