Dissertations / Theses on the topic 'Inhomogeneous fluids'
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Reich, Thorsten Hendrik Bozzo. "Inhomogeneous hard platelet fluids." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=983423806.
Full textZhang, Junfang, and junfang zhang@csiro au. "Computer simulation of nanorheology for inhomogeneous fluids." Swinburne University of Technology. Centre for Molecular Simulation, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20050620.095154.
Full textSartori, Anna. "Wetting at non-planar walls : unbending, unbinding and beyond." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247084.
Full textRazavi, Seyed Mostafa. "OPTIMIZATION OF A TRANSFERABLE SHIFTED FORCE FIELD FOR INTERFACES AND INHOMOGENEOUS FLUIDS USING THERMODYNAMIC INTEGRATION." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1481881698375321.
Full textHerring, Adam Russell. "Computer Simulation Studies of Inhomogeneous Fluids: The Depletion Force and the Disjoining Pressure of Colloidal Physics." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491650.
Full textWu, Liang. "Modelling liquid crystalline ordering in anisotropic and inhomogeneous fluids : from simple models of rod- and disc-like particles to polypeptides." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14620.
Full textHoang, Hai. "Modeling of Simple Fluids Confined in Slit Nanopores : Transport and Poromechanics." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3016/document.
Full textThis work aims at investigating the transport properties and the poromechanics of simple spherical fluids confined in slit nanopores through molecular simulations. To do so, we have proposed different schemes to perform molecular dynamics simulations in ensembles adequate to deal with the properties we were looking after (mass diffusion, shear viscosity,friction force, swelling …). The transport properties of strongly inhomogeneous fluids were found to be varying with space perpendicularly to the solid walls. We have then proposed a non-local approach to determine quantitatively the local shear viscosity of such inhomogeneous fluids from the density profile applicable from the Hard-Sphere to the Lennard-Jones fluids. In addition, it has been shown that highly confined Lennard-Jones fluid may exhibit a visco-plastic (+ shear thinning) behavior when a strong structural order is induced in the whole confined fluid because of the relative position of the solid walls. Finally, it was demonstrated that shear induced modifications of the solvation pressure of a confined fluid may exist that leads to a “dynamic” swelling when a slit micropore is sheared
Kim, Kwangmoo. "Topics in the theory of inhomogeneous media composite superconductors and dielectrics /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180537980.
Full textClotet, i. Fons Xavier. "Imbibition in a model open fracture. Capillary rise, kinetic roughening, and intermittent avalanche dynamics." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284588.
Full textL'objectiu de la tesi és l'estudi de la dinàmica espacio-temporal de la interfície entre aire desplaçat i oli invasor, en desplaçaments d'imbibició a través d'un model de fractura oberta. La recerca presentada combina un extens i exhaustiu treball experimental amb una anàlisi de dades acurada, basada en mètodes utilitzats en física estadística de no-equilibri. El procés d'imbibició, en que el fluid invasor mulla preferentment el medi envaït, és rellevant en diverses situacions d'interès, des de fluxos fisiològics a la irrigació del sòl i l'extracció de petroli. També és un sistema model interessant per a l'estudi de problemes de física fonamental degut a les correlacions de llarg abast que es desenvolupen al front, que indueixen una dinàmica complexa. Primer s'estudia l'avançament de la posició mitjana del front de fluid en condicions d'imbibició espontània (ascens capil•lar). Hem proposat una nova solució analítica que reprodueix els resultats experimentals tant amb presència de gravetat efectiva oposant-se a l'avançament del fluid com sense. En experiments d'imbibició forçada s'ha caracteritzat el procés d'arrugament dinàmic (kineticroughening) del front oli-aire a baixa viscositat. L'escenari d'escalament observat és super-rugós. Finalment s'ha estudiat la dinàmica del sistema en el règim estadísticament estacionari. S'han analitzat les correlacions temporals i espacials de les velocitats des de l'escala local, per sota la mida de les heterogeneïtats del desordre, fins a la mida del sistema. El front mostra una dinàmica a batzegades caracteritzada en termes d'allaus. Les mides i durades d'aquestes allaus estan distribuïdes estadísticament en llei de potències, amb exponents independents de les condicions experimentals, amb un truncament exponencial, que divergeix en reduir el nombre de capil•laritat. La intermitència del senyal s'ha quantificat i se n'ha extret els dos paràmetres que la controlen. El conjunt de resultats presentats en aquesta tesi dóna suport a una descripció molt general de la dinàmica de propagació lenta de fronts d'imbibició fora de l'equilibri en fractura oberta. La conservació local de massa controla la correlació lateral de les fluctuacions de la interfície. La longitud característica de les illes de desordre i la velocitat mitjana del front, per la seva banda, controlen l'avançament del front en la direcció de propagació.
Calleja, Mark. "Simulation and density functional theory of simple inhomogeneous liquids." Thesis, University of Kent, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314605.
Full textGarg, Himani. "Particle laden inhomogeneous elastic turbulence." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I003/document.
Full textLaboratory experiments show that, even in very dilute solutions, the interaction of polymers with fluid flows can dramatically change the properties of turbulent flows or, if the flow is laminar, can trigger a new sort of irregular motion named “elastic turbulence”. Flows in such a dynamical regime are promising for enhancing mixing efficiency in microfluidic applications, which often involve the presence of suspended finite-size impurities, like small and heavy solid particles. The understanding of particle dispersion in high-Reynolds number flows of Newtonian, as well as non-Newtonian, fluids were addressed by previous investigations, and it is a subject of interest both at a fundamental level and for applications, e.g., environmental or industrial ones. However, the dynamics of particles in elastic turbulent flows are still quite unexplored.The present study aims at investigating the aggregation properties of pointlike material particles (heavier than the carrying fluid) in viscoelastic fluids in elastic turbulence conditions (i.e. in the limit of vanishing fluid inertia and large elasticity). We carry out extensive direct numerical simulations of the periodic Kolmogorov mean shear flow of two-dimensional dilute polymer solutions described by the Oldroyd-B model. Both the small- and large-scale features of the resulting inhomogeneous particle distribution are examined, focusing on their connection with the underlying flow structure. Our analysis reveals that particles are preferentially clustered in regions of instantaneously maximally stretched polymers. The intensity of such a phenomenon depends on the interplay, parametrized by the Stokes number, between the particle inertia and the typical time scale associated with the elastic turbulence flow, and is the largest for intermediate values of particle inertia.In particular, it is shown that the preferential concentration of inertial particle suspensions in such turbulent-like flows follow from the dissipative nature of their dynamics. We provide a quantitative characterization of this phenomenon (using correlation and Kaplan-Yorke dimension) that allows to relate it to the accumulation of particles in filamentary highly strained flow regions producing clusters of fractal dimension slightly above 1.At larger scales, particles are found to undergo turbophoretic-like segregation along the non-homogeneity direction of the flow. Indeed, our results indicate that the particle distribution is strongly related to the mean turbulent-like structures of the flow. As an effect of turbophoresis, average density profiles peak in the regions of lowest turbulent eddy diffusivity. The large-scale inhomogeneity of the particle distribution is interpreted in the framework of a model derived in the limit of small, but finite, particle inertia. The qualitative characteristics of different observables (such as root-mean-square deviation of the particle distribution, relative to the uniform one) are, to a good extent, independent of the flow elasticity. When increased, the latter is found, however, to slightly reduce the globally averaged degree of turbophoretic unmixing
Drayton, Michael James. "Eulerian and Lagrangian studies of inhomogeneous turbulence generated by an oscillating grid." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318099.
Full textPanin, Gennadij N., Gerd Tetzlaff, Armin Raabe, Hans-Jürgen Schönfeldt, and A. E. Nasonov. "Inhomogeneity of the land surface and the parameterization of surface fluxes." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-213104.
Full textModeme Meßmethoden zur Erfassung der turbulenten Oberflächenflüsse für fühlbare und latente Wärme sowie Impuls mit Hilfe der Eddy-Korrelations-Methode basieren für die bodennahe Grenzschicht auf der Monin-Obukhov-Turbulenztheorie, die stationäre und horizontal homogene Verhältnisse voraussetzt. Über speziell ausgewählten Oberflächen wurde dieses Konzept häufig mit Erfolg überprüft. Experimente jedoch, die gezielt unter inhomogenen Verhältnissen durchgeführt werden, zeigen oft eine Unterschätzung der turbulenten Oberflächenflüsse. Es wird vorgeschlagen, diese Unterschätzungen als einen Einfluß inhomogener Umbegungsbedingungen und instationärer atmosphärischer Prozesse zu interpretieren und zu systematisieren. Dieses Schema kann dazu beitragen, eine neue Art von Validierungsexperimenten unter natürlichen Verhältnissen einer inhomogenen Umgebung zu entwerfen
Rajaomazava, III Tolotra Emerry. "Dynamique d'un hydrofoil dans un fluide visqueux : algorithmes de couplage en IFS et application." Thesis, Brest, 2014. http://www.theses.fr/2014BRES0062/document.
Full textA numerical study of Fluid Structure Interaction (FSI) in hydrodynamic case is adressed in this thesis. Thirstly, the analysis of coupling methods (staggered schemes) was established to an academic case. It corresponds to the resolution of non linear Burgers equation in a moving domain where the moving interface is assimilated to a mass spring system. According to the time discretisation and linearization of the coupled problem, four coupling scheme can be defined : explicit, semi-implicit, implicit-outer and implicit-inner. A comparative performance study in convergence and computing time were performed. The performance depends on the coupling scheme used. The explicit scheme requires less time compared to the others schemes. However it does not allow the mechanical energy conservation at the interface, inducing the stability issue of the numerical scheme. This instabilities does not arise for the implicit coupling algorithms because the energy conservation at the interface is fulfilled. lndeed, a convergence condition is added for implicit schemes. Even though these schemes require more computing time, they are necessary to get better precision. Inter alia, the fluid-structure interface analysis shows that the gap between the interface taken as the moving boundary and the structure position mostly depends on the actualization scheme of the chosen mesh.In the second part, the coupling algorithm study is extended to physical problem of FSI. A hydrofoil in heave and pitch immersed in a fluid flow is then studied. The equation of hydrofoil movement takes account the distance between the rotation center and the center of gravity. This causes the equation to be nonlinear and introduces a coupling of the two movements (heave and pitch) and a damping of the heave movement. The hydrofoil dynamic is studied for different configurations : forced movements or not, immersed in a fluid at rest or a flowing one. It shows that the hydrofoil movement is pseudo-periodic followed by a damping movement. The hydrodynamic forces tend to follow the same evolution and converge to an equilibrium point. The vibration study clearly shows a frequency modification of the system that depends on the fluid flow (at rest or with an inflow). The problem is also coupled to center of pressure position's equation which depends on the hydrofoil position and the fluid flow. The trend of the position presents a singularity when the lift and drag coefficients vanishes at the same time.Last part, the equation that take into account the inhomogeneous characteristic of the fluid at the fluid-structure interface as well as sheet cavitation in steady or unsteady case, was developed. The method allows the separation of the fluid variables when flowing around the fixed hydrofoil on one hand and the flow generated by the hydrofoil vibration one the other. This introduces an asymmetric added mass operator and an added damping operation due to the variation of the density of the fluid at the interface in unsteady case.The whole system results in a natural frequencies and amplitudes modulation over time
Moore, Stan G. "Chemical Potential Perturbation: A Method to Predict Chemical Potential Using Molecular Simulations." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3248.
Full textPanin, Gennadij N., Gerd Tetzlaff, Armin Raabe, Hans-Jürgen Schönfeldt, and A. E. Nasonov. "Inhomogeneity of the land surface and the parameterization of surface fluxes." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 4 = Meteorologische Arbeiten aus Leipzig ; 2 (1996), S. 204-215, 1996. https://ul.qucosa.de/id/qucosa%3A15066.
Full textModeme Meßmethoden zur Erfassung der turbulenten Oberflächenflüsse für fühlbare und latente Wärme sowie Impuls mit Hilfe der Eddy-Korrelations-Methode basieren für die bodennahe Grenzschicht auf der Monin-Obukhov-Turbulenztheorie, die stationäre und horizontal homogene Verhältnisse voraussetzt. Über speziell ausgewählten Oberflächen wurde dieses Konzept häufig mit Erfolg überprüft. Experimente jedoch, die gezielt unter inhomogenen Verhältnissen durchgeführt werden, zeigen oft eine Unterschätzung der turbulenten Oberflächenflüsse. Es wird vorgeschlagen, diese Unterschätzungen als einen Einfluß inhomogener Umbegungsbedingungen und instationärer atmosphärischer Prozesse zu interpretieren und zu systematisieren. Dieses Schema kann dazu beitragen, eine neue Art von Validierungsexperimenten unter natürlichen Verhältnissen einer inhomogenen Umgebung zu entwerfen.
Yoerger, Edward J. Jr. "Vertical Acoustic Propagation in the Non-Homogeneous Layered Atmosphere for a Time-Harmonic, Compact Source." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2709.
Full textZhao, Sicheng. "Interactive dynamics of fluid flow and metallic alloys solidification." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30010.
Full textWe studied the convective phenomena and their dynamical interaction with the formation of the microstructurs during directional solidification of binary metallic alloys.The post-mortem method was used first to study the Columnar-Equiaxed-Transition during the directional solidification of unrefined Al-3.5wt%Ni in cylindric samples under the Accelerated Crucible Rotation Technique. The numerical imulation was carried out and achieved the results in agreement with experiments.The in-situ technique was applied to understand the evolution of equiaxed grains during solidification of Al-4wt%Cu in function of time. The statistical characteristics of equiaxed grains were discussed.The buoyancy-driven and surface-tension-driven instability convection under vertical and horizontal thermal gradients in a liquid-porous double-layered system were respectively investigated through linear instability analysis.The inhomogeneity of the dendritic mush permeability was taken into account in order to understand its influence on the triggering of convection during the directional solidification of Al-3.5wt%Li
Maurer, Simon Alexander. "Multidisziplinäre Formoptimierung modularer Grundgeometrien für Druckgussbauteile mit strömungs- und strukturmechanischen Zielfunktionen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-197331.
Full textThe virtual development process of an automotive casting part usually begins with classical design tasks and analyses of material strength, stiffness and crash load cases. In the next step, often in cooperation with external suppliers, the tooling concept is developed and casting simulations are used to ensure manufacturability. During manufacturing there is a scatter in process parameters, such as flow velocity or temperature levels, which in turn cause a scatter in the performance of the final product (e.g. local elongation at fracture or ultimate tensile strength). Means to increase process stability and yield are often limited to knowledge-based improvements of the manufacturing process parameters and adaptations of the gating and overflow system. Major changes to the part geometry are usually no longer possible due to project time constraints. Therefore it is the goal of this thesis to optimize modularized basic geometries, like ribs or bends, by using numerical shape optimizations and employ them right from the beginning of the part development process. For the objective functions of the optimizations the disciplines of fluid dynamic filling and the resulting structural behaviour are considered. In addition, the resulting shape is analyzed with regards to robustness towards scatter in manufacturing operating conditions. By using these new modularized geometries the overall robustness of the final product is expected to be increased
Tripathi, Sandeep. "Microstructure and phase behavior of inhomogeneous complex fluids." Thesis, 2005. http://hdl.handle.net/1911/18823.
Full textReich, Thorsten Hendrik Bozzo [Verfasser]. "Inhomogeneous hard platelet fluids / vorgelegt von Thorsten Hendrik Bozzo Reich." 2006. http://d-nb.info/983423806/34.
Full textUrsescu, Ana. "Channel flow of electrorheological fluids under an inhomogeneous electric field." Phd thesis, 2005. https://tuprints.ulb.tu-darmstadt.de/556/1/Dissertation_Ana_Ursescu.pdf.
Full text"Molecular modeling the microstructure and phase behavior of bulk and inhomogeneous complex fluids." Thesis, 2009. http://hdl.handle.net/1911/61870.
Full textUrsescu, Ana [Verfasser]. "Channel flow of electrorheological fluids under an inhomogeneous electric field / vorgelegt von Ana Ursescu." 2005. http://d-nb.info/975134825/34.
Full textNhan, Phan-Thien, and Xi-Jun Fan. "Viscoelastic Mobility Problem Using A Boundary Element Method." 2002. http://hdl.handle.net/1721.1/4021.
Full textSingapore-MIT Alliance (SMA)
Parvar, Saeed. "LES model for inhomogeneous wall-free turbulent flows and flow characteristics in laminar wall-free and wall-dominated viscoelastic fluid flows." Tese, 2021. https://hdl.handle.net/10216/133298.
Full textParvar, Saeed. "LES model for inhomogeneous wall-free turbulent flows and flow characteristics in laminar wall-free and wall-dominated viscoelastic fluid flows." Doctoral thesis, 2021. https://hdl.handle.net/10216/133298.
Full textMaurer, Simon Alexander. "Multidisziplinäre Formoptimierung modularer Grundgeometrien für Druckgussbauteile mit strömungs- und strukturmechanischen Zielfunktionen." Doctoral thesis, 2015. https://tubaf.qucosa.de/id/qucosa%3A23020.
Full textThe virtual development process of an automotive casting part usually begins with classical design tasks and analyses of material strength, stiffness and crash load cases. In the next step, often in cooperation with external suppliers, the tooling concept is developed and casting simulations are used to ensure manufacturability. During manufacturing there is a scatter in process parameters, such as flow velocity or temperature levels, which in turn cause a scatter in the performance of the final product (e.g. local elongation at fracture or ultimate tensile strength). Means to increase process stability and yield are often limited to knowledge-based improvements of the manufacturing process parameters and adaptations of the gating and overflow system. Major changes to the part geometry are usually no longer possible due to project time constraints. Therefore it is the goal of this thesis to optimize modularized basic geometries, like ribs or bends, by using numerical shape optimizations and employ them right from the beginning of the part development process. For the objective functions of the optimizations the disciplines of fluid dynamic filling and the resulting structural behaviour are considered. In addition, the resulting shape is analyzed with regards to robustness towards scatter in manufacturing operating conditions. By using these new modularized geometries the overall robustness of the final product is expected to be increased.:1 Einleitung 1.1 Motivation und Problemstellung 1.2 Zielsetzung und Vorgehensweise 1.3 Stand von Wissenschaft und Technik 2 Grundlagen 2.1 Leichtmetallgussbauteile im Automobil 2.2 Geometrische Gestaltung von Gussbauteilen 2.3 Modellierung gießtechnischer Fertigungsverfahren 2.4 Strukturmechanische Modellierung von Gussbauteilen 2.5 Numerische Optimierung 3 Modellaufbau und -analyse 3.1 Geometrische Entwurfsmodelle 3.2 Strömungsmodellbildung zur Abbildung der Fertigungseinflüsse 3.3 Strukturberechnungsmodell unter Berücksichtigung materieller Defekte 4 Optimierung der Umlenkung 4.1 Optimierungsstrategie und -prozesskette 4.2 Zielfunktionen 4.3 Optimierung mit Entwurfsmodell I 4.4 Optimierung mit Entwurfsmodell II 4.5 Diskussion der Ergebnisse 5 Optimierung der Rippe 5.1 Optimierungsstrategie und -prozesskette 5.2 Ziel- und Restriktionsfunktionen 5.3 Multidisziplinäre Optimierung 5.4 Diskussion der Ergebnisse 6 Zusammenfassung 7 Ausblick Anhang Abkürzungs- und Symbolverzeichnis Literatur- und Quellenverzeichnis