Rozprawy doktorskie na temat „Viscous”
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Koulakis, John. "The viscous catenary". Pomona College, 2006. http://ccdl.libraries.claremont.edu/u?/stc,3.
Pełny tekst źródłaCorvera, Poiré Eugenia. "Anisotropic viscous fingering". Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29002.
Pełny tekst źródłaSavva, Nikos. "Viscous fluid sheets". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41725.
Pełny tekst źródłaIncludes bibliographical references (leaves 108-117).
We present a general theory for the dynamics of thin viscous sheets. Employing concepts from differential geometry and tensor calculus we derive the governing equations in terms of a coordinate system that moves with the film. Special attention is given to incorporating inertia and the curvature forces that arise from the thickness variations along the film. Exploiting the slenderness of the film, we assume that the transverse fluid velocity is small compared to the longitudinal one and perform a perturbation expansion to obtain the leading order equations when the center-surface that defines the coordinate system is parametrized by lines of curvature. We then focus on the dynamics of flat film rupture, in an attempt to gain some insights into the sheet breakup and its fragmentation into droplets. By combining analytical and numerical methods, we extend the prior work on the subject and compare our numerical simulations with experimental work reported in the literature.
by Nikos Savva.
Ph.D.
Beeson-Jones, Timothy. "Controlling viscous fingering". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/275358.
Pełny tekst źródłaSiklos, Malin. "Aspects of viscous shocks". Doctoral thesis, KTH, Numerical Analysis and Computer Science, NADA, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-89.
Pełny tekst źródłaThis thesis consists of an introduction and five papers concerning different numerical and mathematical aspects of viscous shocks.
Hyperbolic conservation laws are used to model wave motion and advect- ive transport in a variety of physical applications. Solutions of hyperbolic conservation laws may become discontinuous, even in cases where initial and boundary data are smooth. Shock waves is one important type of discontinu- ity. It is also interesting to study the corresponding slightly viscous system, i.e., the system obtained when a small viscous term is added to the hyper- bolic system of equations. By a viscous shock we denote a thin transition layer which appears in the solution of the slightly viscous system instead of a shock in the corresponding purely hyperbolic problem.
A slightly viscous system, a so called modified equation, is often used to model numerical solutions of hyperbolic conservation laws and their beha- vior in the vicinity of shocks. Computations presented elsewhere show that numerical solutions of hyperbolic conservation laws obtained by higher order accurate shock capturing methods in many cases are only first order accurate downstream of shocks. We use a modified equation to model numerical solu- tions obtained by a generic second order shock capturing scheme for a time dependent system in one space dimension. We present analysis that show how the first order error term is related to the viscous terms and show that it is possible to eliminate the first order downstream error by choosing a special viscosity term. This is verified in computations. We also extend the analysis to a stationary problem in two space dimensions.
Though the technique of modified equation is widely used, rather little is known about when (for what methods etc.) it is applicable. The use of a modified equation as a model for a numerical solution is only relevant if the numerical solution behaves as a continuous function. We have experimentally investigated a range of high resolution shock capturing methods. Our experiments indicate that for many of the methods there is a continuous shock profile. For some of the methods, however, this not the case. In general the behavior in the shock region is very complicated.
Systems of hyperbolic conservation laws with solutions containing shock waves, and corresponding slightly viscous equations, are examples where the available theoretical results on existence and uniqueness of solutions are very limited, though it is often straightforward to find approximate numerical solu- tions. We present a computer-assisted technique to prove existence of solu- tions of non-linear boundary value ODEs, which is based on using an approx- imate, numerical solution. The technique is applied to stationary solutions of the viscous Burgers' equation.We also study a corresponding method suggested by Yamamoto in SIAM J. Numer. Anal. 35(5)1998, and apply also this method to the viscous Burgers' equation.
Siklosi, Malin. "Aspects of viscous shocks". Doctoral thesis, Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3905.
Pełny tekst źródłaCrosby, Andrew. "Buoyancy-driven viscous flows". Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648304.
Pełny tekst źródłaChakrabarti, Brato. "Catenaries in Viscous Fluid". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53832.
Pełny tekst źródłaMaster of Science
Panda, Satyananda. "The dynamics of viscous fibers". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=979183138.
Pełny tekst źródłaStropky, Dave. "A viscous-inviscid interaction procedure". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28521.
Pełny tekst źródłaApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Campanile, Fabio. "Atomisation of very viscous liquids". Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366413.
Pełny tekst źródłaPhilip, J. "Viscous liquids in bubble columns". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235274.
Pełny tekst źródłaKallinderis, Ioannis. "Adaptation methods for viscous flows". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14525.
Pełny tekst źródłaPienaar, Veruscha. "Viscous flow through sudden contractions". Thesis, Cape Technikon, 2004. http://hdl.handle.net/20.500.11838/929.
Pełny tekst źródłaDespite efforts since the 1950s, laminar flow through pipe fittings is still a topic that needs investigation (Jacobs, 1993). Most experimental studies on this topic include fittings such as contractions, expansions, elbows, valves and orifices (Edwards et aI., 1985; Turian et al., 1998; Pal & Hwang, 1999). Although sudden contractions are not often found in industry, most researchers included these fittings as part of their experimental investigation. The volume of work done on flow through sudden contractions over the last 50 years (e.g. Bogue, 1959; Christian et aI., 1972; Vrentas & Duda, 1973; Boger, 1987; Bullen et aI., 1996; Sisavath et aI., 2002), establishes its place of importance in the fundamental understanding offluid flow and fluid mechanics. There are inconsistent reports on the status ofthe study ofNewtonian fluids flowing through sudden contractions, i.e., that "it is a solved problem" (Boger, 1987) and "that it is far from being resolved" (Sisavath et aI., 2002). One reason for this apparent contradiction is the fact that most experimental studies do not agree with one another or with analytical and numerical studies. A state-of-the-art literature review by Pienaar et al. (2001) confirmed this and that further investigation of this topic is required. To explore these contradictions, it was necessary for one study to do both an experimental and numerical investigation and compare the results with existing literature. It was also important to find some basis for agreement of experimental work and not just add another data set to the existing scattered database. A test facility was built for testing three contraction ratios, i.e., ~ = 0.22, 0.50 and 0.85. A range ofNewtonian and non-Newtonian fluids was tested over a wide range ofReynolds number (Re = 0.01 - 100 000).
Spencer, Diane Susan. "Viscous waves in ⁴He films". Thesis, Royal Holloway, University of London, 1986. http://repository.royalholloway.ac.uk/items/b8e3b448-7abb-447f-8016-7b4539cea48c/1/.
Pełny tekst źródłaRojas, Nicolás. "Dynamics of thin viscous layers". Nice, 2011. http://www.theses.fr/2011NICE4074.
Pełny tekst źródłaThe main objective of this thesis is to study different problems in fluid mechanics and elasticity involving thin and viscous fluid layers. The minimal set equations containing inertial effect in a strongly dissipative regime has been derived, called the inertial lubrification theory (ILT). We study the patterns observed in the vicinity of the Faraday instability, in the limit of a very thin layer ova viscous fluid. Our model captures quantitatively the threshold of instability. The direct simulation of our system permits to predict the patterns observed in experiments. The hydraulic jump problem with axial symmetry is also studied using the inertial lubrification theory. Known asymptotical solutions are found and free parameters are determined. Solutions of the free surface were obtained for a wide range of flows in good agreement with experiments. Also different scaling laws were obtained in a particular limit. Finally, we have used a viscoelastic approach to understand the movement of the sporangia when spores are ejected from the fern to the atmosphere as a reproduction mechanism
McLachlan, Robert I. Keller Herbert Bishop Keller Herbert Bishop. "Separated viscous flows via multigrid /". Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-03122007-112956.
Pełny tekst źródłaMarcotte, Michèle. "Ohmic heating of viscous liquid foods". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ55357.pdf.
Pełny tekst źródłaRees, S. "Stochastic computer simulations of viscous fingering". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235262.
Pełny tekst źródłaCummings, Linda Jane. "Free boundary models in viscous flow". Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339364.
Pełny tekst źródłaPancholi, Ketan Pinakin. "Microbubbling of viscous liquids and suspensions". Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/17281/.
Pełny tekst źródłaKitagawa, K. "Boundary element analysis of viscous flow". Thesis, University of South Wales, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383682.
Pełny tekst źródłaKobine, James Jonathan. "Bifurcations and symmetries in viscous flow". Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:1a1a45bb-0d5a-4553-a93d-b0fa6814fc56.
Pełny tekst źródłaMc, Laughlin Declan T. "Gas entrainment into viscous polymer solutions". Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252316.
Pełny tekst źródłaKirsten, Julius. "Viscous-inviscid interaction on moving walls". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/60591.
Pełny tekst źródłaBarker, Tobias. "Uniqueness results for viscous incompressible fluids". Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:db1b3bb9-a764-406d-a186-5482827d64e8.
Pełny tekst źródłaHolloway, Craig Roy. "Stability of fibre-reinforced viscous flows". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7427/.
Pełny tekst źródłaTeichman, Jeremy Alan 1975. "Wrinkling and sagging of viscous sheets". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29257.
Pełny tekst źródłaVita.
Includes bibliographical references (p. 131-133).
This thesis explores the wrinkling and sagging behavior of thin viscous Newtonian sheets and filaments motivated by analogous scenarios in elasticity. These problems involve dynamic free boundaries and geometric nonlinearities but use simple physics. The first problem examined concerns an annular viscous sheet subjected to torsional shearing which consequently develops spiral wrinkles. Examination of the behavior of this system leads to a scaling of the Stokes equations for zero Reynolds number flow resulting in a reduced order mathematical model for the evolution of the sheet that includes the effects of gravity and surface tension. Linear stability analysis yields the most unstable modes for wrinkling of the sheet and their associated growth rates at onset which agree with experimental observations. In the limit of a narrow annular gap, the problem reduces to that of a sheared rectilinear sheet. Interestingly, this Couette problem shows instabilities even in the zero Reynolds number limit. The second problem examined concerns the sagging of a horizontal viscida (fluid filament) under the influence of gravity. Resistance of the viscida to bending controls the initial phase of deformation, while resistance to stretching begins to play a principal role in later stages. At very late times the process resembles droplet break-off from two thin filaments.
by Jeremy Alan Teichman.
Ph.D.
Rożeń, Antoni. "Investigation of micromixing in viscous liquids". Praca doktorska, Warszawa : Politechnika Warszawska, 1995. https://bcpw.bg.pw.edu.pl/dlibra/docmetadata?showContent=true&id=1705.
Pełny tekst źródłaPark, Sang-Hyuk. "Viscous-inviscid interactions of dense gases". Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/27648.
Pełny tekst źródłaKotikalapudi, Sivaramakrishna. "Spreading of initially spherical viscous droplets". Link to electronic version, 2000. http://www.wpi.edu/Pubs/ETD/Available/etd-0930100-201701/restricted/kotikalapudi.pdf.
Pełny tekst źródłaKeywords: crown; splash; spreading; oscillatory; droplets; microgravity; viscosity; map; stability; solid surface; surface tension; gravity. Includes bibliographical references (p. 111-113).
Kwok, Loong-Piu. "Viscous cross-waves: Stability and bifurcation". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184441.
Pełny tekst źródłaSmith, Diana Elizabeth. "Viscous Relaxation of Craters on Enceladus". Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193360.
Pełny tekst źródłaStokes, Yvonne Marie. "Very Viscous Flows Driven by Gravity with particular application to Slumping of Molten Glass". Title page, contents and abstract only, 1998. http://thesis.library.adelaide.edu.au/public/adt-SUA20020724.171358.
Pełny tekst źródłaKanschat, Guido. "Discontinuous Galerkin methods for viscous incompressible flow". Wiesbaden : Deutscher Universitäts-Verlag, 2008. http://dx.doi.org/10.1007/978-3-8350-5519-3.
Pełny tekst źródłaRowan, Scott A. "Viscous drag reduction in a scramjet combustor /". St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17438.pdf.
Pełny tekst źródłaDressler, Marco Dressler Marco Dressler Marco. "On the flow of highly viscous emulsions". Zürich : [Institut für Agrar- und Ernährungsökonomie, Eidgenössische Technische Hochschule Zürich], 2006. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=26.
Pełny tekst źródłaPauné, i. Xuriguera Eduard. "Interface Dynamics in Two-dimensional Viscous Flows". Doctoral thesis, Universitat de Barcelona, 2002. http://hdl.handle.net/10803/1584.
Pełny tekst źródłaunderlying the physics of interface dynamics, which we hope will exhibit some degree of universality. The aim is twofold: on the one hand we focus on the role of surface tension and viscosity contrast in the dynamics of fingering patterns. On the other hand we introduce a modification of the original problem and study the effects of a inhomogeneous gap between the
plates of a Hele-Shaw cell.
A dynamical systems approach to competition of Saffman-Taylor (ST) fingers in a Hele-Shaw channel is developed. This is based on global analysis of the phase space flow of the ODE sets associated to the exact solutions of the problem without surface tension. A general proof of the existence of finite-time singularities for broad classes of solutions is given. The existence of a continuum of multifinger fixed points and its dynamical implications are discussed. We conclude that exact zero-surface tension solutions taken in a global sense as families of trajectories in phase space are unphysical because the multifinger fixed points are nonhyperbolic. Hyperbolicity (saddle-point structure) of multifinger fixed points is argued to be essential to the physically correct qualitative
description of finger competition. The restoring of hyperbolicity by surface tension is proposed as the key point to formulate a generic Dynamical Solvability Scenario for interfacial pattern selection.
We study the singular effects of vanishingly small surface tension on the dynamics of finger competition in the Saffman-Taylor problem, using the asymptotic techniques developed by Tanveer and Siegel, and numerical computation, following the numerical scheme of Hou, Lowengrub, and
Shelley. We demonstrate the dramatic effects of small surface tension on the late time evolution of two-finger configurations with respect to exact
(non-singular) zero-surface tension solutions. The effect is present even when the zero surface tension solution has asymptotic behavior consistent with selection theory. Such singular effects therefore cannot be traced back to steady state selection theory, and imply a drastic global change in the structure of phase-space flow.
Finger competition with arbitrary viscosity contrast (or Atwood ratio) is
studied by means of numerical computation. Two different types of dynamics
are observed, depending on the value of the viscosity contrast an the
initial condition. One of them exhibits finger competition and ends up in
the ST finger. In opposition, the second dynamics does not exhibit finger
competition and the long time dynamics seems attracted to bubble shaped
solutions. An initial condition appropriate to study the ST finger basin
of attraction is identified, and used to characterize its dependence on
the viscosity contrast, obtaining that its size decreases for decreasing
viscosity contrast, being very small for zero viscosity contrast. The ST
finger is not the universal attractor for arbitrary viscosity contrast. An
alternative class of attractors is identified as the set of Taylor-Saffman
bubble solutions, and one important implication of this result is that the
interface is strongly attracted to finite time pinchoff.
A nonlocal interface equation is derived for two-phase fluid flow, with
arbitrary wettability and viscosity contrast c, in a model porous medium defined as a Hele-Shaw cell with random gap b. Fluctuations of both capillary and viscous pressure are explicitly related to the microscopic quenched disorder, yielding conserved, non-conserved and power-law correlated noise terms. Two length scales are identified that control the possible scaling regimes and which depend on capillary number Ca as l sub 1 = b sub zero (c Ca)(superindex -1/2) and l sub 2 = b sub zero/Ca. Exponents for forced fluid invasion are obtained from numerical simulation and compared with recent experiments,obtaining good partial agreement.
Nguyen, Toan. "Asymptotic stability of noncharacteristic viscous boundary layers". [Bloomington, Ind.] : Indiana University, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3378375.
Pełny tekst źródłaTitle from PDF t.p. (viewed on Jul 12, 2010). Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6259. Adviser: Kevin R. Zumbrun.
Raoofi, Mohammadreza. "Asymptotic behavior of perturbed viscous shock profiles". [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3178477.
Pełny tekst źródłaSource: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3170. Adviser: Kevin Zumbrun. "Title from dissertation home page (viewed Dec. 4, 2006)."
Hovrud, Jan Marius. "Interaction between bodies in a viscous flow". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15824.
Pełny tekst źródłaLevold, Pål. "Viscous Flow Around Finite Lenght Circular Cylinder". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18641.
Pełny tekst źródłaNazer, Nor Shahidah Binti Mohd. "Viscous response in shear of clayey geomaterial". Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27390.
Pełny tekst źródłaMahajan, Sandeep Prakash. "Viscous Effects on Penetrating Shafts in Clay". Diss., Tucson, Arizona : University of Arizona, 2006. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1689%5F1%5Fm.pdf&type=application/pdf.
Pełny tekst źródłaLiu, Hongwei. "Gas-kinetic methods for viscous fluid flows /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MATH%202007%20LIU.
Pełny tekst źródłaKanschat, Guido. "Discontinuous Galerkin methods for viscous incompressible fl". Wiesbaden Dt. Univ.-Verl, 2004. http://dx.doi.org/10.1007/978-3-8350-5519-3.
Pełny tekst źródłaKhomenko, Maria. "Viscous fluid instabilities under an elastic sheet". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23813.
Pełny tekst źródłaAydin, Murat. "Boundary element analyses of laminar viscous flows". Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391707.
Pełny tekst źródłaStallard, 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.
Pełny tekst źródłaKhobeiz, Mohamed Hussien. "Numerical simulation of viscous incompressible turbomachinery flow". Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338828.
Pełny tekst źródła