Dissertations / Theses on the topic 'Fluid flow in DFN'
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Bos, Wouter. "Passive scalar mixing in turbulent flow." Phd thesis, Ecole Centrale de Lyon, 2005. http://tel.archives-ouvertes.fr/tel-00199364.
Full textRaven, Jan-Paul. "Micro-mousse : génération, écoulement et manipulation." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00192819.
Full textBrezina, Jan. "Quelques problèmes mathématiques en thermodynamique des fluides visqueux et compressibles." Phd thesis, Université du Sud Toulon Var, 2008. http://tel.archives-ouvertes.fr/tel-00443927.
Full textMarshall, G. S. "Muiticomponent fluid flow computation." Thesis, Teesside University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384659.
Full textAzevedo, Victor Wagner Freire de. "Simula??o do escoamento multif?sico no interior de bombas de cavidades progressivas met?licas." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15688.
Full textThe progressing cavity pumping (PCP) is one of the most applied oil lift methods nowadays in oil extraction due to its ability to pump heavy and high gas fraction flows. The computational modeling of PCPs appears as a tool to help experiments with the pump and therefore, obtain precisely the pump operational variables, contributing to pump s project and field operation otimization in the respectively situation. A computational model for multiphase flow inside a metallic stator PCP which consider the relative motion between rotor and stator was developed in the present work. In such model, the gas-liquid bubbly flow pattern was considered, which is a very common situation in practice. The Eulerian-Eulerian approach, considering the homogeneous and inhomogeneous models, was employed and gas was treated taking into account an ideal gas state. The effects of the different gas volume fractions in pump volumetric eficiency, pressure distribution, power, slippage flow rate and volumetric flow rate were analyzed. The results shown that the developed model is capable of reproducing pump dynamic behaviour under the multiphase flow conditions early performed in experimental works
O bombeio por cavidades progressivas (BCP) ? um dos m?todos de eleva??o artificial mais utilizados atualmente pela ind?stria do petr?leo devido ? sua capacidade de atuar em reservat?rios de ?leos pesados e com elevada fra??o de g?s. A modelagem computacional de BCPs surge como uma ferramenta para auxiliar os experimentos com a bomba e assim obter com precis?o as suas vari?veis de opera??o, o que contribui para a otimiza??o do projeto e da opera??o da bomba na situa??o a qual se encontra. Um modelo computacional do escoamento multif?sico no interior de uma BCP de estator met?lico que considera o movimento relativo entre o rotor e o estator foi desenvolvido no presente trabalho. Em tal modelo, o escoamento g?s-l?quido no padr?o de bolhas foi considerado, o que ? uma situa??o muito comum na pr?tica. A abordagem Euleriana- Euleriana, considerando o modelo homog?neo e n?o-homog?neo, foi empregada e o g?s foi tratado levando em considera??o um estado de gas ideal. Os efeitos das diferentes fra??es de g?s na efici?ncia da bomba, distribui??o de press?o, pot?ncia, taxa de escorregamento e vaz?o volum?trica foram analisados. Os resultados mostraram que o modelo desenvolvido ? capaz de reproduzir o comportamento din?mico da BCP sob as condi??es de escoamento multif?sico previamente realizados em trabalhos experimentais
Oswell, J. E. "Fluid loading with mean flow." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239158.
Full textPadley, Robert William. "Fluid flow past rotating bodies." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396927.
Full textCooper, Laura. "Investigations of lymphatic fluid flow." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/393578/.
Full textBarker, Shaun, and sbarker@eos ubc ca. "Dynamics of fluid flow and fluid chemistry during crustal shortening." The Australian National University. Research School of Earth Sciences, 2007. http://thesis.anu.edu.au./public/adt-ANU20090711.074630.
Full textKalb, Virginia L. "Low-dimensional models for fluid flow." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1846.
Full textThesis research directed by: Mathematics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Shook, Andrew A. "Fluid flow in horizontal injection regimes." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26738.
Full textApplied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
Pettersson, Patrik. "Fluid flow in wood fiber network." Licentiate thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26639.
Full textGodkänd; 2006; 20070109 (haneit)
Pettersson, Patrik. "Fluid flow in wood fiber networks /." Luleå : Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1757/2006/34/index.html.
Full textYarlagadda, Annapurna Prasad. "Fluid flow in model capillary structures." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/26309.
Full textDavidson, Jonathan. "Dynamics of semi-discretised fluid flow." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364471.
Full textHinz, Denis. "Sources of complexity in fluid flow." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123281.
Full textDans la première partie de cette thèse, les statistiques du modèle de régularisation Navier–Stokes-alpha-beta (NS-alpha-beta) en turbulence homogène et isotrope sont explorées. Les résultats sont comparés aux cas limites du modèle Navier–Stokes-alpha (NS-alpha) et NS-alpha-beta sans contrainte d'échelle inférieure à la maille, ainsi qu'à la simulation numérique directe en haute résolution. Après avoir examiné les spectres de différentes normes énergie, des fonctions de densité de probabilité, des incréments de vitesse filtrés et non-filtrés ainsi que des fonctions de structure de vitesse longitudinales sont présentés. Les différences dans les propriétés statistiques des champs de vitesse non-filtrés et filtrés qui entrent dans les équations principales du modèle NS-alpha et NS-alpha-beta sont mises en évidence et la facilité d'utilisation des deux champs de vitesse à des fins de prévisions réalistes d'écoulement est discutée. L'influence du terme visqueux modifié dans les équations du modèle NS-alpha-beta est étudiée par comparaison avec le cas où le tenseur d'échelle inférieure à la maille sous-jacent est négligé. Le champ de vitesse filtré se trouve à posséder des fonctions de densité de probabilité et les fonctions de structure physiquement plus viables pour l'approximation des résultats de simulations numériques directes. Dans la deuxième partie de cette thèse, la stratégie de test a priori est adoptée pour étudier trois modèles de régularisation alpha différents, à savoir les modèles NS-alpha, Leray-alpha, et Clark-alpha. Les résultats de simulation numériques directs à haute résolution sont utilisés pour calculer la dissipation moyenne d'échelle inférieure à la maille, la répartition spatiale de la dissipation d'échelle inférieure à la maille, et la distribution spatiale des éléments du tenseur de contraintes d'échelle inférieure à la maille. Des prédictions des trois modèles de régularisation sont comparées aux valeurs exactes du tenseur de contraintes d'échelle inférieure à la maille, telles que définies dans les équations de Navier–Stokes filtrées. Le potentiel des trois modèles de régularisation de fournir de bonnes approximations est quantifié à l'aide de coefficients de corrélation spatiale. Nos résultats indiquent la présence d'un choix optimal de paramètre de filtre alpha en fonction de la résolution de la grille de simulation des tourbillons de grande échelle. Dans la troisième partie de cette thèse, un modèle simple de simulation d'écoulements de suspensions actives est étudié. L'approche est basée sur la dynamique des particules dissipatives (DPD). Bien que le modèle soit potentiellement applicable à une large gamme de systèmes de particules automotrices, la classe spécifique de suspensions bactériennes auto-motiles est considérée en tant que un scénario de modélisation. Motilité bactérienne est modélisée grâce à une force d'autopropulsion constante appliquée le long de l'axe de chaque agent. Le modèle tient compte des interactions hydrodynamiques entre les agents automoteurs à travers les interactions dissipatives par paires classiques de la DPD. Des études détaillées de l'influence de la concentration des agents, des interactions dissipatives par paires, et de la friction de Stokes sur les statistiques du système sont fournies. Les simulations sont utilisées pour explorer l'influence des interactions hydrodynamiques dans les suspensions actives. Pour des concentrations élevées de l'agent combinées à des forces dissipatives par paires dominantes, des types de mouvement fortement corrélés et des distributions spectrales d'énergie cinétique analogue à un fluide sont trouvés. En revanche, les systèmes dominés par la friction de Stokes présentent des corrélations spatiales plus faibles du champ de vitesse. Ces résultats indiquent que les interactions hydrodynamiques peuvent jouer un rôle important dans la formation de structures spatialement étendues dans les suspensions actives.
Roberts, William. "Techniques for modelling incompressible fluid flow." Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/12857.
Full textDao, Xuan Quy. "Fluid flow control by visual servoing." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S053/document.
Full textThe visual servoing control approach is formulated for the flow control of the plane Poiseuille flow. Generally, the flow control can lead the flow from its current state to a desired state. In transition to turbulence, the growth of kinetic energy density can lead the flow to turbulence. Moreover, the drag reduction is a potential application in the engineering applications. Therefore, this thesis aims to minimize the kinetic energy density and the skin friction drag. The governing equations of the plane Poiseuille flow are modeled to a standard form in the automatic control. More precisely, the partial differential equations of the plane Poiseuille flow are transformed to a state space representation by using the spectral method. The streamwise and spanwise directions are discretized based on the Fourier series while the wall-normal direction is discretized based on the Chebyshev polynomials. The state vector involves the wall-normal velocity and vorticity. The control signals depend on the inhomogeneous Dirichlet boundary conditions which correspond to blowing/suction boundary control. The number of independent control signals is called the number of the degree of freedom. Moreover, the skin-friction drag and the kinetic energy density are modeled as a function of the state vector. The goal is to minimize both the skin-friction drag and the kinetic energy density by appropriate methods. The partitioned visual servoing control is used to minimize, simultaneously, the skin-friction drag and the kinetic energy density with two degrees of freedom. As a result, the behavior of the skin-friction drag monotonically decreases in time. However, the behavior of the kinetic energy density does not monotonically decrease in time, the similar results from the other methods such as: PID and LQR controls. Therefore, the number of the degree of freedom increases, which leads to the improvement of the kinetic energy density. In addition, when the number of the degree of freedom equals the number of state vector, the kinetic energy density monotonically decreases in time by using the visual servoing control. The dimension of linearized plane Poiseuille flow is large, therefore, we need to reduce the order of controller. We demonstrate that the control law based on a mode reduction can be applied for the full system. Moreover, the kinetic energy density almost will monotonically decreases in time even using two degrees of freedom when the visual servoing control is designed based on the model order reduction
Chatellier, Ludovic. "Modélisation et contrôle actif des instabilités aéroacoustiques en cavité sous écoulement affleurant." Phd thesis, Université de Poitiers, 2002. http://tel.archives-ouvertes.fr/tel-00003529.
Full textKelly, Jason. "Fluid flow through low permeability successions : the application of fluid inclusions." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401364.
Full textLiu, Li. "Computational fluid dynamics modelling of complex fluid flow in stirred vessels." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4753/.
Full textDa, Silvera e. Lorena Manuel Luis Magalhaes de Lima. "Meandering compound flow." Thesis, University of Glasgow, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247866.
Full textCai, Mingchao. "Modeling and numerical simulation for the coupling of surface flow with subsurface flow /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?MATH%202008%20CAI.
Full textHarries, Alun M. "Investigating viscous fluid flow in an internal mixer using computational fluid dynamics." Thesis, Aston University, 2000. http://publications.aston.ac.uk/13261/.
Full textJiao, Li-Fang. "A STUDY ON MICROBUBBLE FLOW BEHAVIORS IN SURFACTANT VISCOELASTIC FLUID FLOW." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174931.
Full textHrubý, Pavel. "Zatížení větrem lehké mostní konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226467.
Full textCrittenden, Thomas M. "Fluid actuators for high speed flow control." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7742.
Full textHan, Gang. "Rock Stability under Different Fluid Flow Conditions." Thesis, University of Waterloo, 2003. http://hdl.handle.net/10012/827.
Full textPolpitiye, Sisira J. "Unsteady fluid flow around certain bluff bodies." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/34813.
Full textAlyaser, Abdelmonem H. "Fluid flow and combustion in rotary kilns." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/NQ34505.pdf.
Full textMala, Gh Mohiuddin. "Heat transfer and fluid flow in microchannels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/NQ39562.pdf.
Full textBurge, Wayne. "Marangoni Instabilities in Two-Layer Fluid Flow." Thesis, University of East Anglia, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518388.
Full textHayward, L. R. "Computer modelling of fluid flow and solidification." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637252.
Full textDickson, P. C. "Modelling fluid flow in seafloor hydrothermal systems." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598538.
Full textKardos, T. N. "Modelling Smoke Flow Using Computational Fluid Dynamics." University of Canterbury. Civil Engineering, 1996. http://hdl.handle.net/10092/8278.
Full textWright, Nigel George. "Multigrid solutions of elliptic fluid flow problems." Thesis, University of Leeds, 1988. http://etheses.whiterose.ac.uk/446/.
Full textZhang, Zhao Kang. "Downhole fluid flow simulation during tripping operations." Thesis, Robert Gordon University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364683.
Full textMATUTTI, OSCAR CORONADO. "TAYLOR-COUETTE INSTABILITY IN VISCOPLASTIC FLUID FLOW." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2814@1.
Full textA superposição de um escoamento circular de Couette e um fluxo com gradiente de pressão axial, através de um espaço anular ocorre em muitas aplicações práticas, tais como: reatores químicos catalíticos, filtros, extratores líquido- líquido, mancais e o fluxo de retorno de lamas de perfuração entre a coluna de perfuração rotatória e a formação rochosa na perfuração de poços produtores de petróleo e gás. As linhas de corrente curvadas do fluxo circular de Couette podem causar uma instabilidade centrífuga que produz vórtices toroidais, conhecidos como vórtices de Taylor. A presença destes vórtices muda as características hidrodinâmicas e a transferência de calor no processo. Em conseqüência, é muito importante ser capaz de prever o aparecimento da instabilidade. A maioria das análises numéricas e experimentais disponíveis na literatura são para fluidos Newtonianos e viscoelásticos (soluções polimericas). Neste trabalho, o efeito das propriedades viscoplásticas de suspensões de altas concentrações neste tipo de escoamento e nas condições críticas para o aparecimento de vórtices são determinadas teoricamente através da solução das equações de conservação. As equações diferenciais foram integradas pelo método de elementos finitos-Galerkin e o sistema de equações algébricas não lineares resultante foi resolvido pelo método de Newton.
The superposition of a circular Couette flow and a pressure- driven axial flow in an annulus occurs in many practical applications, such as catalytic chemical reactors, filtration devices, liquid-liquid extractors, journal bearings, and the return flow of drilling mud between the rotating drill string and the stationary wall in oil and gas well drilling. The curved streamlines of the circular Couette flow can cause a centrifugal instability leading to toroidal vortices, well known as Taylor vortices. The presence of these vortices changes the hydrodynamic and heat transfer characteristics of the process. Therefore, it is very important to be able to predict the onset of instability. Most of the available theoretical and experimental analyses are for Newtonian and viscoelastic (polymeric solutions) liquids. In this work, the effect of the viscoplastic properties of high concentration suspensions on the onset of the Taylor vortices are determined theoretically by solving the conservation equations and searching the critical conditions. The differential equations were solved by the Galerkin / finite element method and the resulting set of non-linear algebraic equations, by Newtons method.
Newling, Benedict. "Magnetic resonance imaging studies of fluid flow." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627496.
Full textKoroleva, Olga Igorevna. "Control and analysis of fluid flow networks /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3112871.
Full textVallejo, Juan Pablo Aguayo. "Prediction of viscoelastic fluid flow in contractions." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42918.
Full textKurban, Adib Paulo Abdalla. "Stratified liquid-liquid flow." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/7553.
Full textBenson, M. "Flow past bluff bodies." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382725.
Full textHo, Weiting. "Distribution of Systemic Macrolides to Gingiva Crevicular Fluid: Effect on Crevicular Fluid Flow." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1242760344.
Full textAl-Asmi, Khalfan. "Vortex shedding in oscillatory flow." Thesis, University of Surrey, 1992. http://epubs.surrey.ac.uk/842864/.
Full textBajer, Konrad. "Flow kinematics and magnetic equilibria." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305335.
Full textRatnanather, John Tilak. "Numerical analysis of turbulent flow." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236094.
Full textRubini, P. A. "Flow modelling in pipe bends." Thesis, University of Sheffield, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234332.
Full textAgg, D. A. "The flow of polymeric fluids." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233667.
Full textArmstrong, Brian Jeffrey. "Unsteady flow over bluff bodies." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/11409.
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