Дисертації з теми "Interaction avalanche and structure"
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Allen, Simon Keith. "Meteorology and snowpack structure associated with avalanche hazard, Porter Heights, Canterbury." Thesis, University of Canterbury. Department of Geography, 2004. http://hdl.handle.net/10092/2778.
Повний текст джерелаZäll, Emma. "Footbridge Dynamics : Human-Structure Interaction." Licentiate thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224527.
Повний текст джерелаPå grund av estetiska skäl och en ökad efterfrågan på kostnadseffektiva och miljövänliga konstruktioner är merparten av de gångbroar som konstrueras idag förhållandevis lätta och slanka. Med anledning av detta ökar risken för att stora svängningar uppstår på grund av dynamisk belastning från människor på bron. För att motverka att detta inträffar kräver dagens normer att komforten verifieras för gångbroar med egenfrekvenser inom området för människans stegfrekvens. Komforten verifieras genom att säkerställa att ett visst accelerationskriterium inte överskrids. För detta ändamål finns handböcker som tillhandahåller förenklade beräkningsmetoder för uppskattning av accelerationsnivåer. Brister i dessa beräkningsmetoder har emellertid identifierats. För det första kan olika typer av människa-bro-interaktion (HSI) ha en betydande inverkan på responsen hos vissa broar. Exempel på en HSI-effekt är att brons modala egenskaper förändras när människor befinner sig på bron; i huvudsak sker en ökning av brons dämpning. Om denna effekt inte tas i beaktande föreligger stor risk att överskatta förväntade accelerationsnivåer. För det andra är kraften från en löpare större än kraften från en gående person vilket gör att en ensam löpare på en gångbro kan ge upphov till accelerationsnivåer som överskrider gränsvärdena för komfort. Löpande personer är därför ett mycket relevant lastfall. Befintliga normer uttrycker inte explicit att någon av dessa aspekter bör tas i beaktande. Behovet av förbättrade riktlinjer för hur normerna bör tillämpas är därför mycket stort och i framtiden kan det bli nödvändigt att kräva att både HSI-effekter och löparlaster tas i beaktande. Därför syftar denna licentiatavhandling till att bidra till en fördjupad förståelse inom dessa två ämnen, med huvudfokus på ovan nämnda HSI-effekt i allmänhet och hur den kan beaktas på ett enkelt, noggrant och tidseffektivt sätt i synnerhet. En numerisk undersökning av HSI-effekten och dess inverkan på den vertikala responsen hos en gångbro genomfördes. Resultaten visar att HSI-effekten reducerar den maximala accelerationen och att störst reduktion erhålls då folksamlingen och bron har ungefär samma egenfrekvens och då folksamlingens massa är stor i förhållande till brons massa. Vidare utvärderades två förenklade metoder för beaktande av HSI-effekten vilka kan implementeras av konstruktörer med grundläggande kunskaper inom strukturdynamik. Det konstaterades att båda metoderna uppskattar HSI-effekten såväl som brons respons förhållandevis väl samtidigt som de reducerar beräkningstiden något jämfört med mer avancerade metoder. Effekten av löpare på gångbroar studerades genom en fallstudie med fältmätningar. Utifrån resultaten från dessa fältmätningar kunde det konstateras att accelerationsgränsen som anges i normerna överskreds när en ensam löpare sprang över bron men inte när en grupp på sju personer gick i takt över samma bro. Därför drogs slutsatsen att löparlaster bör tas i beaktande vid dimensionering av en gångbro.
QC 20180320
Fernandez, Carlos Javier. "Pile-structure interaction in GTSTRUDL." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/21418.
Повний текст джерелаHowell, Richard Martyn. "Snoring : a flow-structure interaction." Thesis, University of Warwick, 2006. http://wrap.warwick.ac.uk/101139/.
Повний текст джерелаEl, Baroudi Adil. "Modélisation en interaction fluide-structure." Rennes 1, 2010. http://www.theses.fr/2010REN1S140.
Повний текст джерелаThis thesis is essentially constituted of two parts. The first part focuses on modeling the skull-brain system during an impact. In this system, the fluid acts as a buffer between the two elastic solids with completely different material properties. During an impact, we are not able to understand untill now some phenomena of brain injury, which is a major challenge in traffic accident. The study used on an existing experimental device from which models were developed. Two models were proposed : inertial coupling and viscous coupling. These have been solved analytically and numerically. The second part deals with the dynamics of the aortic system during a shock. Initially, we study the dynamic response of the ascending branch of the aorta where an analytical solution of the modal problem associated is proposed in order to subsequently use a modal projection technique. Then, the whole system is subjected to a shock. Indeed, in accident research, we observe in some cases, a break at the end portion of descending branch of the aorta : the isthmic rupture phenomenon. In all the study, the heterogeneous character of the aortic wall is taken into account. Various parametric studies have been conducted
Saez, Robert Esteban. "Interaction dynamique non-linéaire sol-structure." Phd thesis, Ecole Centrale Paris, 2009. http://tel.archives-ouvertes.fr/tel-00453297.
Повний текст джерелаAltstadt, Eberhard, Helmar Carl, and Rainer Weiß. "Fluid-Structure Interaction Investigations for Pipelines." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28993.
Повний текст джерелаJones, Christopher Andrew. "Crowd-structure dynamic interaction in stadia." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543299.
Повний текст джерелаPlessas, Spyridon D. "Fluid-structure interaction in composite structures." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41432.
Повний текст джерелаIn this research, dynamic characteristics of polymer composite beam and plate structures were studied when the structures were in contact with water. The effect of fluid-structure interaction (FSI) on natural frequencies, mode shapes, and dynamic responses was examined for polymer composite structures using multiphysics-based computational techniques. Composite structures were modeled using the finite element method. The fluid was modeled as an acoustic medium using the cellular automata technique. Both techniques were coupled so that both fluid and structure could interact bi-directionally. In order to make the coupling easier, the beam and plate finite elements have only displacement degrees of freedom but no rotational degrees of freedom. The fast Fourier transform (FFT) technique was applied to the transient responses of the composite structures with and without FSI, respectively, so that the effect of FSI can be examined by comparing the two results. The study showed that the effect of FSI is significant on dynamic properties of polymer composite structures. Some previous experimental observations were confirmed using the results from the computer simulations, which also enhanced understanding the effect of FSI on dynamic responses of composite structures.
Randall, Richard John. "Fluid-structure interaction of submerged shells." Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/5446.
Повний текст джерелаWarnakulasuriya, Hapuhennedige Surangith. "Soil structure interaction of buried pipes." Thesis, University of East London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286607.
Повний текст джерелаLees, Andrew Steven. "Soil/structure interaction of temporary roadways." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324808.
Повний текст джерелаGiannopapa, Christina-Grigoria. "Fluid structure interaction in flexible vessels." Thesis, King's College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413425.
Повний текст джерелаWright, Stewart Andrew. "Aspects of unsteady fluid-structure interaction." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621939.
Повний текст джерелаJones, Piet. "Structure learning of gene interaction networks." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86650.
Повний текст джерелаENGLISH ABSTRACT: There is an ever increasing wealth of information that is being generated regarding biological systems, in particular information on the interactions and dependencies of genes and their regulatory process. It is thus important to be able to attach functional understanding to this wealth of information. Mathematics can potentially provide the tools needed to generate the necessary abstractions to model the complex system of gene interaction. Here the problem of uncovering gene interactions is cast in several contexts, namely uncovering gene interaction patterns using statistical dependence, cooccurrence as well as feature enrichment. Several techniques have been proposed in the past to solve these, with various levels of success. Techniques have ranged from supervised learning, clustering analysis, boolean networks to dynamical Bayesian models and complex system of di erential equations. These models attempt to navigate a high dimensional space with challenging degrees of freedom. In this work a number of approaches are applied to hypothesize a gene interaction network structure. Three di erent models are applied to real biological data to generate hypotheses on putative biological interactions. A cluster-based analysis combined with a feature enrichment detection is initially applied to a Vitis vinifera dataset, in a targetted analysis. This model bridges a disjointed set of putatively co-expressed genes based on signi cantly associated features, or experimental conditions. We then apply a cross-cluster Markov Blanket based model, on a Saccharomyces cerevisiae dataset. Here the disjointed clusters are bridged by estimating statistical dependence relationship across clusters, in an un-targetted approach. The nal model applied to the same Saccharomyces cerevisiae dataset is a non-parametric Bayesian method that detects probeset co-occurrence given a local background and inferring gene interaction based on the topological network structure resulting from gene co-occurance. In each case we gather evidence to support the biological relevance of these hypothesized interactions by investigating their relation to currently established biological knowledge. The various methods applied here appear to capture di erent aspects of gene interaction, in the datasets we applied them to. The targetted approach appears to putatively infer gene interactions based on functional similarities. The cross-cluster-analysis-based methods, appear to capture interactions within pathways. The probabilistic-co-occurrence-based method appears to generate modules of functionally related genes that are connected to potentially explain the underlying experimental dynamics.
AFRIKAANSE OPSOMMING: Daar is 'n toenemende rykdom van inligting wat gegenereer word met betrekking tot biologiese stelsels, veral inligting oor die interaksies en afhanklikheidsverhoudinge van gene asook hul regulatoriese prosesse. Dit is dus belangrik om in staat te wees om funksionele begrip te kan heg aan hierdie rykdom van inligting. Wiskunde kan moontlik die gereedskap verskaf en die nodige abstraksies bied om die komplekse sisteem van gene interaksies te modelleer. Hier is die probleem met die beraming van die interaksies tussen gene benader uit verskeie kontekste uit, soos die ontdekking van patrone in gene interaksie met behulp van statistiese afhanklikheid , mede-voorkoms asook funksie verryking. Verskeie tegnieke is in die verlede voorgestel om hierdie probleem te benader, met verskillende vlakke van sukses. Tegnieke het gewissel van toesig leer , die groepering analise, boolean netwerke, dinamiese Bayesian modelle en 'n komplekse stelsel van di erensiaalvergelykings. Hierdie modelle poog om 'n hoë dimensionele ruimte te navigeer met uitdagende grade van vryheid. In hierdie werk word 'n aantal benaderings toegepas om 'n genetiese interaksie netwerk struktuur voor te stel. Drie verskillende modelle word toegepas op werklike biologiese data met die doel om hipoteses oor vermeende biologiese interaksies te genereer. 'n Geteikende groeperings gebaseerde analise gekombineer met die opsporing van verrykte kenmerke is aanvanklik toegepas op 'n Vitis vinifera datastel. Hierdie model verbind disjunkte groepe van vermeende mede-uitgedrukte gene wat gebaseer is op beduidende verrykte kenmerke, hier eksperimentele toestande . Ons pas dan 'n tussen groepering Markov Kombers model toe, op 'n Saccharomyces cerevisiae datastel. Hier is die disjunkte groeperings ge-oorbrug deur die beraming van statistiese afhanklikheid verhoudings tussen die elemente in die afsondelike groeperings. Die nale model was ons toepas op dieselfde Saccharomyces cerevisiae datastel is 'n nie- parametriese Bayes metode wat probe stelle van mede-voorkommende gene ontdek, gegee 'n plaaslike agtergrond. Die gene interaksie is beraam op grond van die topologie van die netwerk struktuur veroorsaak deur die gesamentlike voorkoms gene. In elk van die voorgenome gevalle word ons hipotese vermoedelik ondersteun deur die beraamde gene interaksies in terme van huidige biologiese kennis na te vors. Die verskillende metodes wat hier toegepas is, modelleer verskillende aspekte van die interaksies tussen gene met betrekking tot die datastelle wat ons ondersoek het. In die geteikende benadering blyk dit asof ons vermeemde interaksies beraam gebaseer op die ooreenkoms van biologiese funksies. Waar die a eide gene interaksies moontlik gebaseer kan wees op funksionele ooreenkomste tussen die verskeie gene. In die analise gebaseer op die tussen modelering van gene groepe, blyk dit asof die verhouding van gene in bekende biologiese substelsels gemodelleer word. Dit blyk of die model gebaseer op die gesamentlike voorkoms van gene die verband tussen groepe van funksionele verbonde gene modelleer om die onderliggende dinamiese eienskappe van die experiment te verduidelik.
Fairfield, Charles Alexander. "Soil-structure interaction in arch bridges." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/13809.
Повний текст джерелаSim, Jackie H. H. "Human-structure interaction in cantilever grandstands." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:78fa0288-7567-4ea0-83f6-c7e921f6697f.
Повний текст джерелаAltstadt, Eberhard, Helmar Carl, and Rainer Weiß. "Fluid-Structure Interaction Investigations for Pipelines." Forschungszentrum Rossendorf, 2003. https://hzdr.qucosa.de/id/qucosa%3A21726.
Повний текст джерелаTaherzadeh, Reza. "Seismic soil-pile group-structure interaction." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1096.
Повний текст джерелаDespite the significant progress in simple engineering design of surface footing with considering the soil-structure interaction (SSI), there is still a need of the same procedure for the pile group foundation. The main approach to solve this strongly coupled problem is the use of full numerical models, taking into account the soil and the piles with equal rigor. This is however a computationally very demanding approach, in particular for large numbers of piles. The originality of this thesis is using an advanced numerical method with coupling the existing software MISS3D based on boundary element (BE), green's function for the stratified infinite visco-elastic soil and the matlab toolbox SDT based on finite element (FE) method to modeling the foundation and the superstructure. After the validation of this numerical approach with the other numerical results published in the literature, the leading parameters affecting the impedance and the kinematic interaction have been identified. Simple formulations have then been derived for the dynamic stiffness matrices of pile groups foundation subjected to horizontal and rocking dynamic loads for both floating piles in homogeneous half-space and end-bearing piles. These formulations were found using a large data base of impedance matrix computed by numerical FE-BE model. These simple approaches have been validated in a practical case. A modified spectral response is then proposed with considering the soil-structure interaction effect
Brahimi, Malek. "Structure turbulente des panaches thermiques : interaction." Poitiers, 1987. http://www.theses.fr/1987POIT2282.
Повний текст джерелаToubalem, Franck. "Interaction sol-structure en milieu stochastique." Ecully, Ecole centrale de Lyon, 1996. http://bibli.ec-lyon.fr/exl-doc/TH_T1669_ftoubalem.pdf.
Повний текст джерелаHolder, Justin. "Fluid Structure Interaction in Compressible Flows." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin159584692691518.
Повний текст джерелаCormier, Anthony. "Interaction tubuline-nucléotide : structure et biochimie." Paris 6, 2009. http://www.theses.fr/2009PA066030.
Повний текст джерелаJamois, Eric. "Interaction houle-structure en zone côtière." Aix-Marseille 2, 2005. http://theses.univ-amu.fr.lama.univ-amu.fr/2005AIX22083.pdf.
Повний текст джерелаFor the design of marine or coastal structures subject to nonlinear waves in deep to shallow water, it is crucial to take into account both wave/structure and wave/wave interactions on large fluid domains. In this purpose, a high-order Boussinesq-type model has been developed and used to investigate nonlinear wave interactions with piecewise rectangular bottom-mounted (surface piercing) structures. Several practical applications of the model involving highly nonlinear wave run-up on a rigid plate are presented. Both normal and oblique wave conditions are considered. A new physical phenomenon creating large wave amplification in front of reflective structures is also fully studied
Brahimi, Malek. "Structure turbulente des panachés thermiques interaction /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376034157.
Повний текст джерелаSaez, Robert Esteban Modaressi Arézou. "Interaction dynamique non-linéaire sol-structure." S. l. : Ecole centrale de Paris, 2009. http://theses.abes.fr/2009ECAP0012.
Повний текст джерелаRitter, Stefan. "Experiments in tunnel-soil-structure interaction." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273891.
Повний текст джерелаRoussillon, Pierre. "Interaction sol-structure et interaction site-ville : aspects fondamentaux et modélisation." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0008/these.pdf.
Повний текст джерелаWe present a dimensional and parametric analysis of soil structure interaction effects, using simple representative models of structure and closed form impedances of cone model. The effect of a dense urban environment on seismic motions is investigated thanks to macroscopic analytical models: as a first approach, the effect of buildings is described by a mean impedance on the soil-city interface. This enables to identify a mechanical soil-city coupling parameter which governs the magnitude of the interaction, and to determine a characteristic time of the soil-city response. A second more refined model based on approximated wave fields radiated by each building lead to introduce a boundary layer to describe the multiple interactions effect. This work highlights the main mechanisms and governing parameters of single and multiple interaction phenomenon
Roussillon, Pierre Boutin Claude. "Interaction sol-structure et interaction site-ville aspects fondamentaux et modélisation /." Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=roussillon.
Повний текст джерелаAldaikh, Hesham S. H. "Discrete models for the study of dynamic structure-soil-structure interaction." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633205.
Повний текст джерелаphelipot, Annabelle. "Interaction sol-structure lors d'opérations de microtunnelage." Phd thesis, INSA de Lyon, 2000. http://tel.archives-ouvertes.fr/tel-00003398.
Повний текст джерелаCette étude essentiellement expérimentale concerne les problèmes liés au frottement à l'interface sol-canalisation, à la stabilité du front de taille, et enfin aux mouvements induits au sein du massif de sol traversé.
Une première phase d'observations de terrain, basée sur le suivi complet de chantiers de microtunnelage dans des conditions de sol diverses, comportait la caractérisation des terrains traversés ainsi que l'enregistrement des principaux paramètres de fonçage et de pilotage. L'interprétation de ces données a permis de mettre en évidence l'incidence de la nature des terrains, de la surcoupe, de la lubrification et des problèmes de guidage sur les frottements mobilisés, sans permettre toutefois de toujours faire la part de chacun de ces paramètres. Les problèmes de stabilité du front et leur incidence sur les mouvements du sol ont pu également être observés et analysés.
A partir de ces résultats, une étude complémentaire, dans des conditions bien contrôlées, a été entreprise dans une chambre de calibration adaptée à la modélisation du fonçage de canalisations. Les essais réalisés ont permis de cerner plus précisément l'incidence de la surcoupe et de l'injection de lubrifiant sur les frottements mobilisés et sur les mouvements engendrés dans le massif. L'incidence de la surcoupe a été modélisée à l'aide de simulations numériques bidimensionnelles en vue de l'extension aux conditions in situ.
Yogendrakumar, Muthucumarasamy. "Dynamic soil-structure interaction : theory and verification." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29222.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
De, Nayer Guillaume. "Interaction Fluide-Structure pour les corps élancés." Phd thesis, Ecole centrale de nantes - ECN, 2008. http://tel.archives-ouvertes.fr/tel-00820472.
Повний текст джерелаGregson, James. "Fluid-structure interaction simulations in liquid-lead." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12340.
Повний текст джерелаSun, Hepn Wing. "Ground deformation mechanisms for soil-structure interaction." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303931.
Повний текст джерелаStallard, Timothy J. "Simulation of unsteady viscous flow-structure interaction." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418130.
Повний текст джерелаDavid, Thevaneyan Krishta David. "Integral bridges: modelling the soil-structure interaction." Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581881.
Повний текст джерелаDewsbury, Jonathan J. "Numerical modelling of soil-pile-structure interaction." Thesis, University of Southampton, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582152.
Повний текст джерелаZolghadr, Zadeh Jahromi Hamid. "Partitioned analysis of nonlinear soil-structure interaction." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512070.
Повний текст джерелаBlair, Stuart R. "Lattice Boltzmann Methods for Fluid Structure Interaction." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17325.
Повний текст джерелаThe use of lattice Boltzmann methods (LBM) for fluid flow and its coupling with finite element method (FEM) structural models for fluid-structure interaction (FSI) is investigated. A body of high performance LBM software that exploits graphic processing unit (GPU) and multiprocessor programming models is developed and validated against a set of two- and three-dimensional benchmark problems. Computational performance is shown to exceed recently reported results for single-workstation implementations over a range of problem sizes. A mixed-precision LBM collision algorithm is presented that retains the accuracy of double-precision calculations with less computational cost than a full double-precision implementation. FSI modelling methodology and example applications are presented along with a novel heterogeneous parallel implementation that exploits task-level parallelism and workload sharing between the central processing unit (CPU) and GPU that allows significant speedup over other methods. Multi-component LBM fluid models are explicated and simple immiscible multi-component fluid flows in two-dimensions are presented. These multi-component fluid LBM models are also paired with structural dynamics solvers for two-dimensional FSI simulations. To enhance modeling capability for domains with complex surfaces, a novel coupling method is introduced that allows use of both classical LBM (CLBM) and a finite element LBM (FELBM) to be combined into a hybrid LBM that exploits the flexibility of FELBM while retaining the efficiency of CLBM.
Taunton, Paul R. "Centrifuge modelling of soil/masonry structure interaction." Thesis, Cardiff University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244112.
Повний текст джерелаCallaway, Phillip Arthur. "Soil-structure interaction in masonry arch bridges." Thesis, University of Sheffield, 2007. http://etheses.whiterose.ac.uk/3036/.
Повний текст джерелаCadby, Jonathan R. "Wave/structure interaction in two-layer fluids." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/7554.
Повний текст джерелаNitikitpaiboon, Chanwut. "Finite element formulations for fluid-structure interaction." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/37500.
Повний текст джерелаIncludes bibliographical references (leaves 123-128).
by Chanwut Nitikitpaiboon.
Ph.D.
Siddorn, Philip David. "Efficient numerical modelling of wave-structure interaction." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:de36bd2f-cd23-4f11-b67f-9d8cd48ecd3c.
Повний текст джерелаPaquette, Yves. "Interaction Fluide-Structure et Érosion de Cavitation." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI104/document.
Повний текст джерелаHis numerical work focuses on the collapse of a single air bubble close to adeformable wall generated by the impact of an incident high-pressure wave. A CFD code was fully coupled to a FEM solid code in order to compute the bubble collapse and the subsequent plastic deformation in the material. The CFD code was developed from the numerical model of Johnsen et al. (University of Michigan). A mobile mesh capability was added in order to account for the displacement of the fluid-structure interface. An ALE (Arbitrary LagrangianEulerian) method was implemented to switch from an Eulerian description in a fixed mesh to an Eulerian description in a moving mesh. The solid response to bubble collapse was computed with the FEM software CAST3M (developed by CEA) assuming an elastic-plastic constitutive law for the material. The communication between the two codes is achieved through the MPI library.For the CFD code, bubble collapse dynamics was validated by comparison with two others codes: research software CaviFlow and commercial software Ansys Fluent. The coupling between the CFD and the FEM code was validated on the case of the impact of a wave on an elastic medium.The paper will present a detailed analysis in 2D of both the dynamics of bubble collapse and solid behaviour for various conditions. They were obtained by changing the amplitude of the incident shock wave, the standoff distance and the material properties. Special attention will be given to the shock wave that forms when the microjet hits the bubble interface and to the impact of this shock wave on the material surface. In particular, the damping of the impactpressure with respect to a perfectly rigid wall was computed as well as the plastic deformation of the material surface. These final data gave us crucial information about the requirement of taking account of fluid-structure interaction in numerical modeling of cavitation erosion
Gout, d'Henin Emmanuelle. "Ondes de Stoneley en interaction fluide-structure." Poitiers, 2002. http://www.theses.fr/2002POIT2263.
Повний текст джерелаCevaer, Franck. "Interaction sol-structure. Modélisation des fonctions d'impédance." Nantes, 1993. http://www.theses.fr/1993NANT2009.
Повний текст джерелаNayer, Guillaume de. "Interaction fluide-structure pour les corps élancés." Nantes, 2008. http://www.theses.fr/2008NANT2090.
Повний текст джерелаThe current computational resources lead the different scientific disciplines to get closer to each other, in order to consider more and more complex phenomena. Thus, one of the axis of research of the CFD Team from École Centrale Nantes is the Fluid-Structure Interaction (FSI). In this context, the development of a large displacement structural solver for elongated bodies and its coupling with the non-structured finite volume RANSE solver, ISIS, has been done. This thin beam solver relies on the Cosserat theory and on the ``geometrically exact'' approach. The space coupling on the interpolations and the information transfer at the fluid-structure interface were realised with caution, in order to be as accurate as possible and to fulfill the load conservation. Since the beam solver can be used for great displacements, an original technique had to be built to update the fluid computational domain. It is based on the pseudo solid approach, which allows a precise control over the mesh deformation through a local behaviour law of the pseudo-solid. Each part of the FSI code has been checked: the structural solver on 2D/3D test-cases, in statics and in dynamics, in small and large displacements; the remeshing module has been tested on various geometries and with MPI. Finally, some FSI applications have been performed: two bidimensional examples, a steady case and a fully unsteady one; then, the program has shown its capabilities in 3D on a deformable cable in a current with a fixed end. The computation of a riser towed in a multifluid environment at rest has also been done and studied
Le, Nam B. "Structure-Interaction Effects In Novel Nanostructured Materials." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6296.
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