Dissertations / Theses on the topic 'Fundamental and theoretical fluid dynamics'
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Almqvist, Torbjörn. "Computational fluid dynamics in theoretical simulations of elastohydrodynamic lubrication." Doctoral thesis, Luleå, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26754.
Full textGodkänd; 2004; 20061030 (haneit)
Orlowski, Joshua D. Voigt Robert C. "A fundamental study of sand investment systems using computational particle fluid dynamics." [University Park, Pa.] : Pennsylvania State University, 2009. http://honors.libraries.psu.edu/theses/approved/WorldWideIndex/EHT-37/index.html.
Full textDelnoij, Erik. "Fluid dynamics of gas-liquid bubble columns a theoretical and experimental study /." Enschede : University of Twente [Host], 1999. http://doc.utwente.nl/9458.
Full textWordsworth, Robin D. "Theoretical and experimental investigations of turbulent jet formation in planetary fluid dynamics." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531799.
Full textPapadopoulos, Konstantinos. "Theoretical frameworks for the upscaling of physical interactions in aquatic mobile-boundary flows." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=233119.
Full textRedrow, John B. "An investigation into the theoretical and analytical basis for the spread of airborne influenza." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10277.
Full textTitle from document title page. Document formatted into pages; contains x, 83 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-83).
Franco, Alejandro A. "A multiscale modeling framework for the transient analysis of PEM Fuel Cells - From the fundamentals to the engineering practice." Habilitation à diriger des recherches, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00740967.
Full textGravelle, Simon. "Nanofluidics : a theoretical and numerical investigation of fluid transport in nanochannels." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10238.
Full textThis thesis discusses various situations linked to transport at the nanoscale. The first chapter is an introduction to nanofluidics, containing a review of characteristic lengths, forces, or phenomena existing at the nanoscale. The second chapter is a study of the impact of geometry on the hydrodynamic permeability of a nanopore. This study, inspired by the shape of aquaporins, suggests a possible optimisation of permeability for bi-conical channels. The third chapter is a study of capillary filing inside subnanometric carbon channels which highlights the importance of the disjoining pressure induced by the fluid structuring inside the nanochannel. The fourth chapter is a study of nanofluidic diode, a component known to mimic the behaviour of semiconductor diode. The study highlights a strong coupling between water and ion dynamics which leads to a water flow rectification inside the diode. The fifth and last chapter is a study of the origin of commonly observed pink noise (1=f) in ionic current measurements through nanopores
Bozkaya, Canan. "Boundary Element Method Solution Of Initial And Boundary Value Problems In Fluid Dynamics And Magnetohydrodynamics." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609552/index.pdf.
Full textMoevius, Lisa. "Droplet dynamics on superhydrophobic surfaces." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:52737169-86fa-41ef-abae-0883a67ecaad.
Full textBussman, Wesley Ryan. "A theoretical and experimental investigation of near-wall turbulence in drag reducing flows /." Access abstract and link to full text, 1990. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9111869.
Full textTalbot, David C. "An Experimental and Theoretical Investigation of the Efficiency of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1330630066.
Full textBrandén, Henrik. "Convergence Acceleration for Flow Problems." Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-576.
Full textGérard, Thomas. "Theoretical study of spatiotemporal dynamics resulting from reaction-diffusion-convection processes." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209861.
Full textDans ce contexte, le but de notre thèse a été d'étudier de manière théorique et sur des modèles réaction-diffusion-convection simples les propriétés de dynamiques spatio-temporelles résultant du couplage chimie-hydrodynamique.
Nous nous sommes focalisés sur les instabilités hydrodynamiques de digitation visqueuse et de densité qui apparaissent respectivement lorsqu'un fluide dense est placé au-dessus d'un fluide moins dense dans le champ de gravité et lorsqu'un fluide visqueux est déplacé par un fluide moins visqueux dans un milieu poreux.
En particulier, nous avons étudié les problèmes suivants:
- L'influence d'une réaction chimique de type A + B → C sur la digitation visqueuse. Nous avons montré que les structures formées lors de cette instabilité varient selon que le réactif A est injecté dans le réactif B ou vice-versa si ces réactifs n'ont pas un coefficient de diffusion ou une concentration initiale identiques.
- Le rôle de pertes de chaleur par les parois du réacteur dans le cadre de la digitation de densité de fronts autocatalytiques exothermiques. Nous avons caractérisé les conditions de stabilité de fronts en fonction des pertes de chaleur et expliqué l'apparition de zones anormalement chaudes lors de cette instabilité.
- L'influence de l'inhomogénéité du milieu sur la digitation de densité de solutions réactives ou non. Nous avons montré que les variations spatiales de perméabilité d'un milieu poreux peuvent figer ou faire osciller la structure de digitation dans certaines conditions.
- L'influence d'un champ électrique transverse sur l'instabilité diffusive et la digitation de densité de fronts autocatalytiques. Il a été montré que cette interaction peut donner lieu à des nouvelles structures et changer les propriétés du front.
En conclusion, nous avons montré que le couplage entre réactions chimiques et mouvements hydrodynamiques est capable de générer de nouvelles structures spatio-temporelles dont les propriétés dépendent entre autres des conditions imposées au système.
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In industrial reactors or in nature, fluid flows can be coupled to chemical reactions. In many cases, the result is the emergence of complex structures whose properties depend among others on the geometry of the system.
In this context, the purpose of our thesis was to study theoretically using simple models of reaction-diffusion-convection, the properties of dynamics resulting from the coupling between chemistry and hydrodynamics.
We focused on the hydrodynamic instabilities of viscous and density fingering that occur respectively when a dense fluid is placed above a less dense one in the gravity field and when a viscous fluid is displaced by a less viscous fluid in a porous medium.
In particular, we studied the following issues:
- The influence of a chemical reaction type A + B → C on viscous fingering. We have shown that the fingering patterns observed during this instability depends on whether the reactant A is injected into the reactant B or vice versa if they do not have identical diffusion coefficients or initial concentrations.
- The role of heat losses through the reactor walls on the density fingering of exothermic autocatalytic fronts. We have characterized the conditions of stability of fronts depending on heat losses and explained the appearance of unusually hot areas during this instability.
- The influence of the inhomogeneity of the medium on the density fingering of reactive solutions or not. We have shown that spatial variations of permeability of a porous medium may freeze or generate oscillating fingering pattern under certain conditions.
- The influence of a transverse electric field on the Rayleigh-Taylor and diffusive instabilities of autocatalytic fronts. It was shown that this interaction may lead to new structures and may change the properties of the front.
In conclusion, we showed that the coupling between chemical reactions and hydrodynamic motions can generate new space-time structures whose properties depend among others, on the conditions imposed on the system.
Doctorat en Sciences
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Patel, Nayan V. "Simulation of Hydrodynamic Fragmentation from a Fundamental and an Engineering Perspective." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16225.
Full textBredberg, Irene. "The Einstein and the Navier-Stokes Equations: Connecting the Two." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10214.
Full textPhysics
Falk, Kerstin. "The molecular origin of fast fluid transport in carbon nanotubes : theoretical and molecular dynamics study of liquid/solid friction in graphitic nanopores." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10167/document.
Full textWithin the scope of this thesis, a theoretical study of liquid flow in graphitic nanopores was performed. More precisely, a combination of numerical simulations and analytic approach was used to establish the special properties of carbon nanotubes for fluid transport: Molecular dynamics flow simulations of different liquids in carbon nanotubes exhibited flow velocities that are 1-3 orders of magnitude higher than predicted from the continuum hydrodynamics framework and the no-slip boundary condition. These results support previous experiments performed by several groups reporting exceptionally high flow rates for water in carbon nanotube membranes. The reason for this important flow enhancement with respect to the expectation was so far unclear. In this work, a careful investigation of the water/graphite friction coefficient which we identified as the crucial parameter for fast liquid transport in the considered systems was carried out. In simulations, the friction coefficient was found to be very sensitive to wall curvature: friction is independent of confinement for water between at graphene walls with zero curvature, while it increases with increasing negative curvature (water at the outside of the tube), and it decreases with increasing positive curvature (water inside the tube), eventually leading to quasi frictionless flow for water in a single file configuration in the smallest tubes. A similar behaviour was moreover found with several other liquids, such as alcohol, alcane and OMCTS. urthermore, a theoretical approximate expression for the friction coefficient is presented which predicts qualitatively and semi-quantitatively its curvature dependent behavior. Moreover, a deeper analysis of the simulations according to the proposed theoretical description shed light on the physical mechanisms at the origin of the ultra low liquid/solid friction in carbon nanotubes. In fine, it is due to their perfectly ordered molecular structure and their atomically smooth surface that carbon nanotubes are quasi-perfect liquid conductors compared to other membrane pores like, for example, nanochannels in amorphous silica. The newly gained understanding constitutes an important validation that carbon nanotubes operate as fast transporters of various liquids which makes them a promising option for different applications like energy conversion or filtration on the molecular level
Falk, Kerstin. "The molecular origin of fast fluid transport in carbon nanotubes: theoretical and molecular dynamics study of liqui/solid friction in graphitic nanopores." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00922185.
Full textMcCray, John Emory. "Enhanced dissolution of multiple-component nonaqueous phase organic liquids in porous media using Cyclodextrin theoretical, laboratory, and field investigations /." Diss., The University of Arizona, 1998. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1998_72_sip1_w.pdf&type=application/pdf.
Full textLi, Chunying Anna, and 李春穎. "Theoretical modeling and experimental studies of particle-laden plumesfrom wastewater discharges." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37318640.
Full textTick, Geoffrey Ray. "Dissolution and enhanced solubilization of immiscible phase organic liquids in porous media : Theoretical, laboratory, and field investigations." Diss., The University of Arizona, 2003. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2003_398_sip1_w.pdf&type=application/pdf.
Full textLoodts, Vanessa. "Influence of chemical reactions on convective dissolution: a theoretical study." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/242093.
Full textDoctorat en Sciences
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Norman, Adam Edward. "A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs)." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81836.
Full textMaster of Science
Bayraktar, Songul. "Theoretical And Experimental Investigation On Centrifugal Fan With A Special Interest On Fan Noise." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12608097/index.pdf.
Full textelik A.S. Research and Development Laboratories. The validation experiments indicate that there is a good agreement between numerical and experimental results. The experimental study with different fan designs gives information about the noise reduction possibilities.
Sun, Huawei. "Theoretical and experimental study of a high rise hog building for improved utilization and environmental quality protection." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1079066940.
Full textTitle from first page of PDF file. Document formatted into pages; contains xii, 200 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Frederick C. Michel, Jr., Dept. of Food, Agricultural, and Biological Engineering. Includes bibliographical references (p. 173-181).
Malone, James Michael. "An Analysis of the Nonlinear Interaction of Peak Frequencies in Resonant Cavity Flows." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1204037947.
Full textPlappally, Anand Krishnan. "Theoretical and Empirical Modeling of Flow, Strength, Leaching and Micro-Structural Characteristics of V Shaped Porous Ceramic Water Filters." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276860054.
Full textD'Hernoncourt, Jessica. "Influence of thermal effects and electric fields on fingering of chemical fronts: a theoretical study." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210607.
Full textIn this context our work aims to understand theoretically in which way a chemical reaction can induce and influence such instabilities in a fluid initially at rest.
To understand the dynamics resulting from the coupling between chemical reactions and hydrodynamical instabilities we use chemical fronts as model systems. These fronts result from the coupling between autocatalytical chemical reactions and diffusion and they allow to create a self-organized interface between the products and the reactants. As during a chemical reaction the density may vary due to solutal and thermal effects, the products and the reactants can have different densities which may trigger convection movements leading to the destabilization of the fronts.
We have in particular studied the influence of the exothermicity of the reaction on the fingering of chemical fronts, focusing first on the influence of heat losses through the walls of the set-up.
These leaks have a marked influence on the dynamics because they affect the temperature profiles and hence the density profiles too. We have also classified the various types of instabilities that may appear dues to solutal and thermal effects. We have found a new type of hydrodynamic instability of statically stable fronts induced by the chemical reaction.
We have furthermore analyzed an isothermal model with two chemical species. If they diffuse at different rates the front can be subject to diffusive instabilities as well. We have shown that the coupling between such a diffusive instability and fingering can trigger complex dynamics. We have eventually studied the influence of an external electric field on the diffusive instabilities and on fingering underlying the possibility to destabilize otherwise stable fronts./
Différents types d'instabilités hydrodynamiques peuvent affecter les interfaces entre deux fluides comme par exemple, une instabilité de Rayleigh-Taylor (ou digitation de densité) quand un fluide plus dense se trouve placé au-dessus d'un fluide moins dense dans le champ de gravité ou des instabilités de double diffusion induites par des différences entre les diffusivités d'un soluté et de la chaleur contenus dans les fluides. Dans ce contexte, notre thèse s'attache à comprendre de manière théorique comment une réaction chimique peut influencer ces instabilités voire les générer dans un fluide initialement au repos. Pour étudier les dynamiques résultant du couplage entre réactions chimiques et instabilités hydrodynamiques, nous utilisons des systèmes modèles: les fronts chimiques de conversion résultant de la compétition entre réactions chimiques autocatalytiques et diffusion créant une interface auto-organisée entre les réactifs et les produits. Comme au cours d'une réaction chimique la densité peut varier par des effets solutaux et thermiques, les produits et les réactifs de densités différentes peuvent générer des mouvements de convection qui conduisent à la déstabilisation des fronts.
Nous avons en particulier étudié l'influence de l'exothermicité de la réaction sur les instabilités de digitation de fronts chimiques, en nous focalisant dans un premier temps sur l'influence des pertes de chaleur par les parois du réacteur.
Ces fuites ont un effet marqué sur les instabilitités car elles affectent les profils de température et donc les profils de densité dans le système. Nous avons également classifié les différentes instabilités qui peuvent apparaître via des changements de densité dûs à des effets thermiques et solutaux et mis en évidence un nouveau type de déstabilisation hydrodynamique de fronts statiquement stables induit par une réaction chimique.
Nous avons ensuite analysé un modèle isotherme impliquant deux espèces chimiques. Si ces dernières diffusent a des vitesses différentes le front peut être sujet à une instabilité diffusive. Nous avons montré qu'un couplage entre une telle instabilité diffusive et de la digitation peut être à l'origine de dynamiques complexes. Nous avons ensuite considéré l'influence d'un champ électrique sur les instabilité diffusives et de digitation en soulignant la possibilié de déstabiliser via ce champ des fronts initialement stables.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Ke, Xinyou. "Fundamental Studies on Transport Phenomena in Redox Flow Batteries with Flow Field Structures and Slurry or Semi-Solid Electrodes: Modeling and Experimental Approaches." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1543883710323558.
Full textThomine, Olivier. "Développement de méthodes multi-échelles pour la simulation numérique des écoulements réactifs diphasiques." Phd thesis, Université de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00683632.
Full textMohammad, Nopoush. "NON-EQUILIBRIUM HYDRODYNAMICS OF THE QUARK-GLUON PLASMA." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1554403936171225.
Full textPakala, Akshay Kumar. "Aerodynamic Analysis of Conventional and Spherical Tires." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1606237030779529.
Full textGhanbarian-Alavijeh, Behzad. "Modeling Physical and Hydraulic Properties of Disordered Porous Media: Applications from Percolation Theory and Fractal Geometry." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401380554.
Full textOngkodjojo, Ong Andojo. "Electrohydrodynamic Microfabricated Ionic Wind Pumps for Electronics Cooling Applications." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1354638816.
Full text(5930039), Mario Tindaro Migliorino. "Numerical and Theoretical Modeling of Thermoacoustic Instabilities in Transcritical Fluids." Thesis, 2019.
Find full textPhillips, Phillip Joseph. "Finite element methods in linear poroelasticity: theoretical and computational results." Thesis, 2005. http://hdl.handle.net/2152/2365.
Full textCaldwell, Jack A. "The theoretical determination of the fluid potential distribution in jointed rocks." Thesis, 2015. http://hdl.handle.net/10539/16480.
Full textMendoza, Nicole Renee. "On the Fundamental Unsteady Fluid Dynamics of Shock-Induced Flows through Ducts." Thesis, 2013. http://hdl.handle.net/1969.1/149437.
Full textvon, Goeler Friedel S. "Some theoretical problems in the physics of charged polymers." 1997. https://scholarworks.umass.edu/dissertations/AAI9809408.
Full textPeery, Travis B. "A theoretical description of anisotropic chemical association and its application to hydrogen-bonded fluids." Thesis, 2003. http://hdl.handle.net/1957/31171.
Full textGraduation date: 2003
McCall, Katherine Rose. "Theoretical studies in rock physics: 1. Pore space geometry and fluid magnetization. 2. Elasticity in a borehole geometry." 1992. https://scholarworks.umass.edu/dissertations/AAI9219465.
Full textBertram, Jason. "Entropy-related principles for non-equilibrium systems : theoretical foundations and applications to ecology and fluid dynamics." Phd thesis, 2015. http://hdl.handle.net/1885/155776.
Full textSaad, Tony. "Theoretical Models for Wall Injected Duct Flows." 2010. http://trace.tennessee.edu/utk_graddiss/748.
Full textShukla, Vishwanath. "Particles and Fields in Superfluid Turbulence : Numerical and Theoretical Studies." Thesis, 2014. http://hdl.handle.net/2005/2933.
Full text(9216107), Jordan D. F. Petty. "Modeling a Dynamic System Using Fractional Order Calculus." Thesis, 2020.
Find full textFractional calculus is the integration and differentiation to an arbitrary or fractional order. The techniques of fractional calculus are not commonly taught in engineering curricula since physical laws are expressed in integer order notation. Dr. Richard Magin (2006) notes how engineers occasionally encounter dynamic systems in which the integer order methods do not properly model the physical characteristics and lead to numerous mathematical operations. In the following study, the application of fractional order calculus to approximate the angular position of the disk oscillating in a Newtonian fluid was experimentally validated. The proposed experimental study was conducted to model the nonlinear response of an oscillating system using fractional order calculus. The integer and fractional order mathematical models solved the differential equation of motion specific to the experiment. The experimental results were compared to the integer order and the fractional order analytical solutions. The fractional order mathematical model in this study approximated the nonlinear response of the designed system by using the Bagley and Torvik fractional derivative. The analytical results of the experiment indicate that either the integer or fractional order methods can be used to approximate the angular position of the disk oscillating in the homogeneous solution. The following research was in collaboration with Dr. Richard Mark French, Dr. Garcia Bravo, and Rajarshi Choudhuri, and the experimental design was derived from the previous experiments conducted in 2018.