Дисертації з теми "Perfect Fluids"
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Rowlingson, Robert R. "A class of perfect fluids in general relativity." Thesis, Aston University, 1990. http://publications.aston.ac.uk/12060/.
Повний текст джерелаDaher, Ivo Martins. "Soluções das equações de campo de Einstein para fluidos perfeitos estáticos com simetria esférica." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1012.
Повний текст джерелаNesta dissertação, procuramos soluções exatas das equações de campo de Einstein em Relatividade Geral que descrevem um fluido perfeito em um espaço-tempo estático com simetria esférica. A técnica utilizada para encontrar essas soluções é o algoritmo de Kovacic, que pode ser aplicado a equações diferenciais ordinárias lineares e homogêneas de segunda ordem com coeficientes racionais. Esse algoritmo é capaz de nos dar soluções fechadas em termos de funções liouvillianas, se tal equação tiver esse tipo de solução. Para esse fim, vários sistemas de coordenadas foram investigados até encontrar o que fosse mais adequado à aplicação do algoritmo. Impondo que a função da métrica 11 g seja racional, ficamos com uma equação diferencial linear e homogênea de segunda ordem que tem coeficientes racionais. Nesse trabalho, as formas arbitradas foram: g11=-A/4x x-z1/x-Z1, g11=-A/4x x-z1/(x-Z1)(x-Z2), g11=-A/4x (x-z1) (x-z2)/x-Z1 e g11= -A/4x (x-z1) (x-z2)/ 4x(x-Z1) (x-Z2) onde x é uma coordenada espacial da métrica e Α, z1 , z2 , Z1 e Z2 são parâmetros dos modelos. Depois de obter soluções analíticas, verificamos se elas satisfazem determinadas condições físicas e, então, poderiam ser utilizadas como modelos de estrelas de nêutrons sem rotação (estrelas de alta densidade).
Sandin, Patrik. "The asymptotic states of perfect fluid cosmological models." Licentiate thesis, Karlstad : Faculty of Technology and Science, Physics, Karlstads universitet, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-4713.
Повний текст джерелаRadford, James E. Burdick Joel Wakeman. "Symmetry, reduction and swimming in a perfect fluid /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-06042003-181857.
Повний текст джерелаKitchingham, David William. "Generating techniques in vacuum and stiff perfect fluid cosmologies." Thesis, Queen Mary, University of London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337947.
Повний текст джерелаMitsuda, Eiji, and Akira Tomimatsu. "Breakdown of self-similar evolution in homogeneous perfect fluid collapse." American Physical Society, 2006. http://hdl.handle.net/2237/8842.
Повний текст джерелаMessenger, Paul Henry. "Rotating perfect fluid bodies in Einstein's general theory of relativity." Thesis, University of South Wales, 2005. https://pure.southwales.ac.uk/en/studentthesis/rotating-perfect-fluid-bodies-in-einsteins-general-theory-of-relativity(127bc15d-ff0d-4f8e-80fe-351c24273697).html.
Повний текст джерелаDorostkar, Ali. "Applications of the perfectly matched layers in a discontinuous fluid media." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176541.
Повний текст джерелаHajj-Boutros, Joseph. "Détermination des nouvelles solutions exactes d’Einstein dans le cas intérieur." Paris 6, 1987. http://www.theses.fr/1987PA066421.
Повний текст джерелаLoeschcke, Christian [Verfasser]. "On the relaxation of a variational principle for the motion of a vortex sheet in perfect fluid / Christian Loeschcke." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1044868945/34.
Повний текст джерелаReho, Riccardo. "Il tensore energia-impulso per un fluido perfetto in relatività ristretta e generale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14520/.
Повний текст джерелаCarigi, Giulia. "Modello iperbolico del fluido perfetto barotropico e il problema dell'instabilita gravitazionale secondo Jeans." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5923/.
Повний текст джерелаКосторний, Сергій Дмитрович, Сергей Дмитриевич Косторной, Serhii Dmytrovych Kostornyi та М. В. Хилько. "Модель течения идеальной жидкости, учитывающая особенности граничных условий реальной жидкости". Thesis, Сумский государственный университет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31453.
Повний текст джерелаBhuddi, Ajit. "Approche ondulatoire pour la description numérique du comportement vibroacoustique large bande des conduites avec fluide interne." Thesis, Tours, 2015. http://www.theses.fr/2015TOUR4046/document.
Повний текст джерелаIn this work, a wave finite element (WFE) method is proposed to predict the sound radiation of finite axisymmetric fluid-filled pipes immersed in an external acoustic fluid of infinite extent, The Sommerfeld radiation condition is taken into account by means of a perfectly matched layer (PML) around the external fluid. Within the WFE framework, the fluid-filled pipe, the surrounding fluid and the PML constitute a multiphysics waveguide that is discretized by means of a periodic finite element mesh, and is treated as an assembly of identical subsystems of small length. Wave modes are computed from the FE model of a multi-physics subsystem and used as a representation basis to assess the vibroacoustic behavior of the finite waveguide at a low computational cost. Numerical experiments are carried out in the cases of axisymmetric pipes of either homogeneous or multi-layered crosssections, The accuracy and efficiency of the proposed approach are dearly highlighted in comparison with the conventional FE method
Damamme, Gilles. "Contribution à la théorie hydrodynamique de l'onde de détonation dans les explosifs condensés." Poitiers, 1987. http://www.theses.fr/1987POIT2034.
Повний текст джерелаLuppé, Francine. "Contribution a l'etude de l'onde de scholte-stoneley a differentes interfaces fluide parfait/solide elastique." Paris 7, 1987. http://www.theses.fr/1987PA077222.
Повний текст джерелаHolgersson, David. "Lanczos potentialer i kosmologiska rumtider." Thesis, Linköping University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2582.
Повний текст джерелаWe derive the equation linking the Weyl tensor with its Lanczos potential, called the Weyl-Lanczos equation, in 1+3 covariant formalism for perfect fluid Bianchi type I spacetime and find an explicit expression for a Lanczos potential of the Weyl tensor in these spacetimes. To achieve this, we first need to derive the covariant decomposition of the Lanczos potential in this formalism. We also study an example by Novello and Velloso and derive their Lanczos potential in shear-free, irrotational perfect fluid spacetimes from a particular ansatz in 1+3 covariant formalism. The existence of the Lanczos potential is in some ways analogous to the vector potential in electromagnetic theory. Therefore, we also derive the electromagnetic potential equation in 1+3 covariant formalism for a general spacetime. We give a short description of the necessary tools for these calculations and the cosmological formalism we are using.
Radermacher, Katharina Maria. "Strong Cosmic Censorship and Cosmic No-Hair in spacetimes with symmetries." Doctoral thesis, KTH, Matematik (Avd.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220400.
Повний текст джерелаDenna avhandling består av tre artiklar som undersöker det asymptotiska beteendet hos kosmologiska rumstider med symmetrier som uppstår i Matematisk Allmän Relativitetsteori. I Artikel A och B studerar vi rumstider med Bianchi symmetri och där materiemodellen är en ideal fluid. Vi undersöker beteendet av sådana rumstider nära ursprungssingulariteten ('Big Bang'). I Artikel A bevisar vi att den Starka Kosmiska Censur-förmodan håller för icke-exceptionella Bianchi klass B-rumstider. Med hjälp av expansions-normaliserade variabler visar vi detaljerade asymptotiska uppskattningar. I Artikel B visar vi liknande uppskattningar för stela fluider. I Artikel C betraktar vi T2-symmetriska rumstider som uppfyller Einsteins ekvationer för ett icke-linjärt skalärfält. För givna begynnelsedata visar vi global existens och entydighet av lösningar till motsvarande differentialekvationer för all framtid. I det speciella fallet med en konstant potential, en situation som motsvarar ett linjärt skalärfält på en bakgrund med en positiv kosmologisk konstant, undersöker vi i detalj det asymptotiska beteendet mot framtiden. Vi visar att den Kosmiska Inget-Hår-förmodan håller för lösningar som uppfyller en ytterligare a priori uppskattning, en uppskattning som vi visar gäller i T3-Gowdy-symmetri.
QC 20171220
Young, Roland Michael Brendon. "Predictability of a laboratory analogue for planetary atmospheres." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:b4f483a6-437c-4914-b94e-cb04d996b337.
Повний текст джерелаPeynaud, Emilie. "Rayonnement sonore dans un écoulement subsonique complexe en régime harmonique : analyse et simulation numérique du couplage entre les phénomènes acoustiques et hydrodynamiques." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0019/document.
Повний текст джерелаThis thesis deals with the numerical simulation of time harmonic acoustic propagation in an arbitrary mean flow in an unbounded domain. Our approach is based on an equation equivalent to the linearized Euler equations called the Galbrun equation. It is derived from a mixed Eulerian-Lagrangian formulation and results in a single equation whose only unknown is the perturbation of the Lagrangian displacement. A direct solution using finite elements is unstable but this difficulty can be overcome by using an augmented equation which is constructed by adding a new unknown, the vorticity, defined as the curl of the displacement. This leads to a set of equations coupling a wave like equation with a time harmonic transport equation which allows the use of perfectly matched layers (PML) at artificial boundaries to bound the computational domain. The first part of the thesis is a study of the time harmonic transport equation and its approximation by means of a discontinuous Galerkin scheme, the difficulties coming from the oscillating behaviour of its solutions. Once these difficulties have been overcome, it is possible to deal with the resolution of the acoustic propagation problem. The approximation method is based on a mixed continuous-Galerkin and discontinuous-Galerkin finite element scheme. The well-posedness of both the continuous and discrete problems is established and the convergence of the approximation under some mean flow conditions is proved. Finally a numerical implementation is achieved and numerical results are given which confirm the validity of the method and also show that it is relevant in complex cases, even for unstable flows
Mthethwa, Thulani Richard. "New classes of exact solutions for charged perfect fluids." Thesis, 2012. http://hdl.handle.net/10413/10533.
Повний текст джерелаThesis (M.Sc.)-University of KwaZulu-Natal, Durban, 2012.
Mewalal, Narenee. "Exact solutions for perfect fluids conformal to a Petrov type D spacetime." Thesis, 2011. http://hdl.handle.net/10413/6288.
Повний текст джерелаRadford, James Edward. "Symmetry, Reduction and Swimming in a Perfect Fluid." Thesis, 2003. https://thesis.library.caltech.edu/2431/1/Radford_je_2003.pdf.
Повний текст джерелаMasood-ul-Alam, A. K. M. "The topology of asymptotically Euclidean static perfect fluid space-time." Phd thesis, 1985. http://hdl.handle.net/1885/136573.
Повний текст джерелаTichý, Jakub. "Kvalitativní vlastnosti řešení rovnic mechaniky tekutin." Doctoral thesis, 2014. http://www.nusl.cz/ntk/nusl-332562.
Повний текст джерелаD'Ambroise, Jennie. "Generalized EMP and Nonlinear Schrodinger-type Reformulations of Some Scaler Field Cosmological Models." 2010. https://scholarworks.umass.edu/open_access_dissertations/225.
Повний текст джерелаMbarek, Saoussen. "Les bulles de masse négative dans un espace de de Sitter." Thèse, 2013. http://hdl.handle.net/1866/10429.
Повний текст джерелаWe study different situations of matter distribution of a negative mass bubble. For the case of static and spherically symmetric bubbles, we start with the hypothesis saying that this kind of bubble, being a solution of Einstein equations, is a deformation of scalar field. We show that this idea must be rejected and replaced by another saying that the bubble is formed by a perfect fluid. We succeed to demonstrate that this is the proper matter distribution within Schwarzschild-De Sitter geometry, that it satisfies all conditions and that we’re capable of resolving numerically its parameters of pressure and density.
Zingan, Valentin Nikolaevich. "Discontinuous Galerkin Finite Element Method for the Nonlinear Hyperbolic Problems with Entropy-Based Artificial Viscosity Stabilization." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10845.
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