Relevant bibliographies by topics / Perfect Fluids

Academic literature on the topic 'Perfect Fluids'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Perfect Fluids"

1

Bastiaensen, B., H. R. Karimian, N. Van den Bergh, and L. Wylleman. "Purely radiative perfect fluids." Classical and Quantum Gravity 24, no. 13 (June 12, 2007): 3211–20. http://dx.doi.org/10.1088/0264-9381/24/13/005.

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Kramer, D. "Rigidly rotationg perfect fluids." Astronomische Nachrichten: A Journal on all Fields of Astronomy 307, no. 5 (1986): 309–12. http://dx.doi.org/10.1002/asna.2113070519.

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Stastna, J. "Hamilton's principle for perfect fluids." International Journal of Mathematical Education in Science and Technology 17, no. 3 (May 1986): 311–14. http://dx.doi.org/10.1080/0020739860170306.

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Garfinkle, David, E. N. Glass, and J. P. Krisch. "Solution Generating with Perfect Fluids." General Relativity and Gravitation 29, no. 4 (April 1997): 467–80. http://dx.doi.org/10.1023/a:1018882615955.

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Neilsen, David W., and Matthew W. Choptuik. "Critical phenomena in perfect fluids." Classical and Quantum Gravity 17, no. 4 (January 25, 2000): 761–82. http://dx.doi.org/10.1088/0264-9381/17/4/303.

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Pomeau, Yves. "Vortex dynamics in perfect fluids." Journal of Plasma Physics 56, no. 3 (December 1996): 407–18. http://dx.doi.org/10.1017/s0022377800019371.

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I review the current status of a problem, relevant to both plasma physics and ordinary fluid mechanics, namely the long-time behaviour of solutions of the perfect fluid equations. In two space dimensions, thanks in particular to the work of D. Montgomery, the situation is now quite clear, since one expects the formation at long times of large vortices in a background of potential flow. In three dimensions, the situation is blurred, although its understanding is a central issue for fully developped turbulence. I present some new estimates for a possible scenario of self-similar blow up of solutions of 3D Euler. That turns out to be a rather subtle question, if one tries to stay consistent with the conservation of circulation and of energy.
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Tarachand, R. K., and N. Ibotombi Singh. "Slowly-rotating cosmological perfect fluids." Astrophysics and Space Science 137, no. 1 (1987): 85–91. http://dx.doi.org/10.1007/bf00641622.

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Van den Bergh, N. "Nonrotating and nonexpanding perfect fluids." General Relativity and Gravitation 20, no. 2 (February 1988): 131–38. http://dx.doi.org/10.1007/bf00759323.

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Kramer, Dietrich. "Perfect fluids with conformal motion." General Relativity and Gravitation 22, no. 10 (October 1990): 1157–62. http://dx.doi.org/10.1007/bf00759016.

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Van den Bergh, N. "Conformally Ricci‐flat perfect fluids." Journal of Mathematical Physics 27, no. 4 (April 1986): 1076–81. http://dx.doi.org/10.1063/1.527151.

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Dissertations / Theses on the topic "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/.

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This thesis is concerned with exact solutions of Einstein's field equations of general relativity, in particular, when the source of the gravitational field is a perfect fluid with a purely electric Weyl tensor. General relativity, cosmology and computer algebra are discussed briefly. A mathematical introduction to Riemannian geometry and the tetrad formalism is then given. This is followed by a review of some previous results and known solutions concerning purely electric perfect fluids. In addition, some orthonormal and null tetrad equations of the Ricci and Bianchi identities are displayed in a form suitable for investigating these space-times. Conformally flat perfect fluids are characterised by the vanishing of the Weyl tensor and form a sub-class of the purely electric fields in which all solutions are known (Stephani 1967). The number of Killing vectors in these space-times is investigated and results presented for the non-expanding space-times. The existence of stationary fields that may also admit 0, 1 or 3 spacelike Killing vectors is demonstrated. Shear-free fluids in the class under consideration are shown to be either non-expanding or irrotational (Collins 1984) using both orthonormal and null tetrads. A discrepancy between Collins (1984) and Wolf (1986) is resolved by explicitly solving the field equations to prove that the only purely electric, shear-free, geodesic but rotating perfect fluid is the Godel (1949) solution. The irrotational fluids with shear are then studied and solutions due to Szafron (1977) and Allnutt (1982) are characterised. The metric is simplified in several cases where new solutions may be found. The geodesic space-times in this class and all Bianchi type 1 perfect fluid metrics are shown to have a metric expressible in a diagonal form. The position of spherically symmetric and Bianchi type 1 space-times in relation to the general case is also illustrated.
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Daher, 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.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Nesta 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).
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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.

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Radford, 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.

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Kitchingham, 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.

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Mitsuda, Eiji, and Akira Tomimatsu. "Breakdown of self-similar evolution in homogeneous perfect fluid collapse." American Physical Society, 2006. http://hdl.handle.net/2237/8842.

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Messenger, 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.

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The study of rotating astrophysical bodies is of great importance in understanding the structure and development of the Universe. Rotating bodies, are not only of great interest in their own right, for example pulsars, but they have also been targeted as prime possible sources of gravitational waves, currently a topic of great interest. The ability of general relativity to describe the laws and phenomena of the Universe is unparalleled, but however there has been little success in the description of rotating astrophysical bodies. This is not due to a lack of interest, but rather the sheer complexity of the mathematics. The problem of the complexity may be eased by the adoption of a perturbation technique, in that a spherically symmetric non-rotating fluid sphere described by Einstein's equations is endowed with rotation, albeit slowly, and the result is expressed and analysed using Taylor's series. A further consideration is that of the exterior gravitational field, which must be asymptotically flat. It has been shown from experiment that, in line with the prediction of general relativity, a rotating body does indeed drag space-time around with it. This leads to the conclusion that the exterior gravity field must not only be asymptotically flat, but must also rotate. The only vacuum solution to satisfy these conditions is the Kerr metric. This work seeks to show that an internal rotating perfect fluid source may be matched to the rotating exterior Kerr metric using a perturbation technique up to and including second order parameters in angular velocity. The equations derived, are used as a starting point in the construction of such a perfect fluid solution, and it is shown how the method may be adapted for computer implementation.
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Dorostkar, 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.

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In this thesis we study the applications of the PML in a multi-layered media. The PML is constructed  for the scalar wave equation and the convergence and stability of the continuous problem is studied using the normal mode analysis. A high order accurate semi-discrete problem is constructed  by approximating the spatial derivatives with high order finite difference operators  satisfying the summation-by-parts properties. To have a stable semi-discrete approximation of the problem, we impose boundary conditions as well as interface conditions using the simultaneous approximation term technique. In order to gain accuracy, a transformed interface condition is constructed for the PML. The semi-discrete problem is approximated using second order accurate central difference scheme. To achieve higher order accuracy we modify the time marching scheme to eliminate truncation errors. Numerical experiments are presented showing that using the proposed transformed interface conditions, higher order of accuracy and convergence are achieved.
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Hajj-Boutros, Joseph. "Détermination des nouvelles solutions exactes d’Einstein dans le cas intérieur." Paris 6, 1987. http://www.theses.fr/1987PA066421.

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Ensemble de travaux réalisé dans le cadre de la théorie de la relativité générale. La métrique de l'espace-temps adoptée est à symétrie bien précise pour simplifier dans la mesure du possible les équations du champ d’Einstein. Dans le cadre de la symétrie sphérique statique et non statique, nous avons obtenu de nouvelles solutions des équations du champ (cas intérieur). Dans le cas de la symétrie plane, nous avons pu engendrer plusieurs nouvelles solutions statiques et non statiques. Nous avons mis au point de nouvelles solutions du type cosmologique. L'espace-temps utilise étant essentiellement homogène, nous avons pu étudier le caractère non isotropique de la singularité initiale. Les conditions physiques ont été respectées. Dans le cas des solutions cosmologiques nous avons pu construire un modèle rendant compte de l'évolution possible de notre univers depuis son état initial radiatif et singulier jusqu'à son état actuel. Nous avons trouvé une solution globalement régulière dans le cadre de la symétrie cylindrique. La technique du calcul utilise a consisté dans la plupart des cas à linéariser les équations du champ.
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Loeschcke, 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.

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Books on the topic "Perfect Fluids"

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Perfect incompressible fluids. Oxford: Clarendon Press, 1998.

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Rowlingson, Robert Richard. A class of perfect fluids in general relativity. Birmingham: Aston University. Department of Computing Science and Applied Mathematics, 1990.

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Gnoffo, Peter A. An upwind-biased, point-implicit relaxation algorithm for viscous, compressible perfect-gas flows. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Gnoffo, Peter A. An upwind-biased, point-implicit relaxation algorithm for viscous, compressible perfect-gas flows. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Gnoffo, Peter A. An upwind-biased, point-implicit relaxation algorithm for viscous, compressible perfect-gas flows. Hampton, Va: Langley Research Center, 1990.

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Tatum, Kenneth E. Computation of thermally perfect properties of oblique shock waves. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1996.

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Escudier, Marcel. Fluids and fluid properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0002.

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In this chapter it is shown that the differences between solids, liquids, and gases have to be explained at the level of the molecular structure. The continuum hypothesis makes it possible to characterise any fluid and ultimately analyse its response to pressure difference Δ‎p and shear stress τ‎ through macroscopic physical properties, dependent only upon absolute temperature T and pressure p, which can be defined at any point in a fluid. The most important of these physical properties are density ρ‎ and viscosity μ‎, while some problems are also influenced by compressibility, vapour pressure pV, and surface tension σ‎. It is also shown that the bulk modulus of elasticity Ks is a measure of fluid compressibility which determines the speed at which sound propagates through a fluid. The perfect-gas law is introduced and an equation derived for the soundspeed c.
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Deruelle, Nathalie, and Jean-Philippe Uzan. Self-gravitating fluids. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786399.003.0015.

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This chapter briefly describes ‘perfect fluids’. These are characterized by their mass density ρ‎(t, xⁱ), pressure p(t, ⁱ), and velocity field v(t, ⁱ). The motion and equilibrium configurations of these fluids are determined by the equation of state, for example, p = p(ρ‎) for a barotropic fluid, and by the gravitational potential U(t, ⁱ) created at a point ⁱ by other fluid elements. The chapter shows that, given an equation of state, the equations of the problem to be solved are the continuity equation, the Euler equation, and the Poisson equation. It then considers static models with spherical symmetry, as well as polytropes and the Lane–Emden equation. Finally, the chapter studies the isothermal sphere and Maclaurin spheroids.
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Escudier, Marcel. Compressible fluid flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0011.

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Compressible-gas flow through convergent and convergent-divergent nozzles is analysed in this chapter based upon the conservation laws for mass, momentum, and energy, together with considerations of thermodynamics. It is shown that in both cases the key parameter in describing the flow is the Mach number, which is used to distinguish between subsonic and supersonic flow. So that significant results can be achieved, the flowing fluid is treated as a perfect gas, and the flow as one dimensional. Flow through a convergent nozzle and the choking limitation is discussed. Flow through a normal shockwave, which is an important feature of supersonic flow, is also analysed. No account is taken of surface friction or heat transfer, and the flow upstream and downstream of a shockwave is treated as isentropic. In addition, the conditions are discussed under which a shockwave arises in compressible flow through a convergent-divergent nozzle.
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Durand, William Frederick. Aerodynamic Theory: A General Review of Progress under a Grant of the Guggenheim Fund for the Promotion of Aeronautics Volume II Division e General Aerodynamic Theory--Perfect Fluids Th. Von Kármán and J. M. Burgers. Springer London, Limited, 2013.

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Book chapters on the topic "Perfect Fluids"

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Rieutord, Michel. "Flows of Perfect Fluids." In Fluid Dynamics, 71–109. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09351-2_3.

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Bahouri, Hajer, Jean-Yves Chemin, and Raphaël Danchin. "Euler System for Perfect Incompressible Fluids." In Grundlehren der mathematischen Wissenschaften, 291–333. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16830-7_7.

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Sieniutycz, Stanislaw. "Eulerian and Lagrangian descriptions of perfect fluids." In Conservation Laws in Variational Thermo-Hydrodynamics, 26–71. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1084-6_2.

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Deville, Michel O. "Plane Irrotational Flows of Perfect Fluid." In An Introduction to the Mechanics of Incompressible Fluids, 137–74. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04683-4_6.

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AbstractThis chapter treats the theory of irrotational flows of perfect fluids by the use of complex variables. The theory is based on a complex velocity and the related concepts like circulation, flow rate, complex potential. Several simple examples are given. More elaborated is the flow around a circular cylinder with and without circulation . Using conformal mapping and especially the Joukowski transformation, it is possible to consider an aerodynamics application, namely the flow around an airfoil. Blasius theorem allows for the computation of the forces and moment generated by the flow around an immersed body. It is applied to the case of the cylinder and Joukowski profile.
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Simon, Walter. "Criteria for (In)finite Extent of Static Perfect Fluids." In The Conformal Structure of Space-Time, 223–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45818-2_11.

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Van den Bergh, Norbert. "Conformally Reducible Perfect Fluids with 2-Spaces of Constant Curvature." In Progress in Mathematical Relativity, Gravitation and Cosmology, 445–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40157-2_68.

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Lübbe, Christian, and Juan A. Valiente Kroon. "The Conformal Einstein Field Equations for Trace-free Perfect Fluids." In Springer Proceedings in Physics, 137–43. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06761-2_17.

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Galper, A., and T. Miloh. "On the motion of a non-rigid sphere in a perfect fluid." In Theoretical, Experimental, and Numerical Contributions to the Mechanics of Fluids and Solids, 627–42. Basel: Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-9229-2_33.

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Fuchs, Martin, and Gregory Seregin. "Weak solutions to boundary value problems in the deformation theory of perfect elastoplasticity." In Variational Methods for Problems from Plasticity Theory and for Generalized Newtonian Fluids, 5–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/bfb0103753.

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Chéret, Roger. "Jump Relations in a Perfect Fluid." In Detonation of Condensed Explosives, 27–61. New York, NY: Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4613-9284-2_2.

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Conference papers on the topic "Perfect Fluids"

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LASKY, P., and A. LUN. "SPHERICALLY SYMMETRIC GRAVITATIONAL COLLAPSE OF PERFECT FLUIDS." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0389.

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MITSKIEVICH, NIKOLAI V. "ELECTROMAGNETISM AND PERFECT FLUIDS INTERPLAY IN MULTIDIMENSIONAL SPACETIMES." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0140.

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WYLLEMAN, LODE. "PURELY ELECTRIC PERFECT FLUIDS OF PETROV TYPE D." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0374.

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WYLLEMAN, LODE. "APPLICATIONS OF THE ORTHO-COMPLEX-NULL (OCN) FORMALISM TO PERFECT FLUIDS." In Proceedings of the MG12 Meeting on General Relativity. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814374552_0319.

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Penkov, Viktor Borisovich, Maksim Vladimirovich Polikarpov, and Lyubov Vladimirovna Levina. "Efficient Solutions of Mixed-Type Axial Symmetry Problems for Perfect Fluids." In 2020 2nd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA). IEEE, 2020. http://dx.doi.org/10.1109/summa50634.2020.9280583.

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He, Xiuhua, Hongcai Zhuo, Xulian Deng, Jian Wang, and Fu Li. "The Optimization Analysis on Piezoelectric Micromixer With Modified Tesla Tubes." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-22022.

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With consideration of the good configuration of Tesla tube and its perfect performance used in micromixer and micropump, an integration of micromixer and micropump, a novel type of piezoelectric micromixer has been designed. In order to improve the performance of the micromixer, analysis on structure parameters of the Tesla tube, and the optimization on it is the chief work in this paper. Firstly, a novel type of piezoelectric micromixer with Tesla tubes and piezoelectric actuator has been designed, and its structure and working principle were described. Secondly, the numerical analysis on the micromixer with prearranged parameters was carried out to analyze its pumping and mixing performances. Thirdly, an optimization on the structure to improve its performance was carried out. The values of three main structure parameters of the Tesla tube, K = W1/W3, L1 and L2 were changed to analyze their effects on λ and σ which stand for pumping and mixing performances respectively, then two groups perfect values of those three parameters were selected for optimization. Finally, a perfect design scheme was selected to be structure of mixer; numerical analysis was carried out on it in application of dynamic mesh model. Two fluids arrived perfect mixing after 0.4s with the value of Reynolds number 200, at driven frequency 100Hz, middle displacement amplitude of piezoelectric actuator 15μm. This result demonstrates that, pumping and mixing performances of the piezoelectric micromixer were validated, and its working performance has been improved with the optimization on Tesla tubes, which can be reference for study afterward.
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Li, Hao-Ming, Wahid Ghaly, and Ibrahim Hassan. "Experimental Investigations of a Comb-Like Film Cooling Scheme." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4695.

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Abstract The performance of a simple slot is perfect, but it does not have structural integrity. A new advanced cooling scheme with perfect performance and practical structural integrity is presented. Based on the crucial effect of the counter-rotating vortex pair (CRVP) on the film cooling effectiveness (η), the new scheme is composed of a comb-like structure and a blind slot, in which the comb structure maintains the mechanical strength, and the blind slot is intended to eliminate the CRVP and produce a smooth coolant film. The new scheme is investigated experimentally with the transient thermochromic liquid crystal (TLC) technique. Two classic geometries, the cylindrical hole and the simple slot, were also measured. The agreement of their results with the published data validated the present experimental facilities. The experimental results of the Comb scheme demonstrated that, with practical structural integrity, the new scheme has perfect performance, which bears comparison with the simple slot. Consequently, the success of the Comb scheme proved the crucial CRVP effect on η.
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Zhou, Jia, Paul Carman, Hong Sun, Richard Wheeler, Harold Brannon, and D. V. Satya Gupta. "Nearly Perfect Proppant Transport by Particle Fracturing Fluids Yields Exciting Opportunities in Well Completion Applications." In SPE European Formation Damage Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174267-ms.

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King, Joe A. "Recommendations for the Long-Term Success of Industrial Collaboration in Engineering Training Programs (Keynote Paper)." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45478.

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The Engineering Department at Harvey Mudd College developed an industrial sponsored engineering training program in the mid 1960’s. The program now called “The Clinic” is a central part of Harvey Mudd College. Over the years, representatives from a number of colleges have visited our campus in an effort to learn about the program and implement similar programs at their home institutions. The efforts to duplicate the HMC Clinic Program at other institutions have met with varied success. The reasons for the less than perfect success rate are discussed and guidelines for developing a firmly anchored program with potential for long-term survivability and growth are discussed.
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Gonzalez, Miguel, Subhash Ayirala, Lyla Maskeen, and Abdulkarim Sofi. "Miniature Viscosity Sensors for EOR Polymer Fluids." In SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209430-ms.

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Abstract There are currently no technologies available to measure polymer solution viscosities at realistic downhole conditions in a well during enhanced oil recovery (EOR). In this paper, custom-made probes using quartz tuning fork (QTF) resonators are demonstrated for measurements of viscosity of polymer fluids. The electromechanical response of the resonators was calibrated in simple Newtonian fluids and in non-Newtonian polymer fluids at different concentrations. The responses were then used to measure field-collected samples of polymer injection fluids. The measured viscosity values by tuning forks were lower than those measured by the conventional rheometer at 6.8 s-1, indicating the effect of viscoelasticity of the fluid. However, the predicted rheometer viscosity versus QTF measured viscosity showed a perfect exponential correlation, allowing for calibration between the two viscometers. The QTF sensors were shown to successfully produce accurate viscosity measurements of polymer fluids within the required polymer concentration ranges used in the field, and predicted field sample viscosities with less than 5% error from the rheometer data. These devices can be easily integrated into portable systems for lab or wellsite deployment as well as logging tools for downhole deployment.
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Reports on the topic "Perfect Fluids"

1

Kamai, Tamir, Gerard Kluitenberg, and Alon Ben-Gal. Development of heat-pulse sensors for measuring fluxes of water and solutes under the root zone. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604288.bard.

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The objectives defined for this study were to: (1) develop a heat-pulse sensor and a heat-transfer model for leaching measurement, and (2) conduct laboratory study of the sensor and the methodology to estimate leaching flux. In this study we investigated the feasibility for estimating leachate fluxes with a newly designed heat-pulse (HP) sensor, combining water flux density (WFD) with electrical conductivity (EC) measurements in the same sensor. Whereas previous studies used the conventional heat pulse sensor for these measurements, the focus here was to estimate WFD with a robust sensor, appropriate for field settings, having thick-walled large-diameter probes that would minimize their flexing during and after installation and reduce associated errors. The HP method for measuring WFD in one dimension is based on a three-rod arrangement, aligned in the direction of the flow (vertical for leaching). A heat pulse is released from a center rod and the temperature response is monitored with upstream (US) and downstream (DS) rods. Water moving through the soil caries heat with it, causing differences in temperature response at the US and DS locations. Appropriate theory (e.g., Ren et al., 2000) is then used to determine WFD from the differences in temperature response. In this study, we have constructed sensors with large probes and developed numerical and analytical solutions for approximating the measurement. One-dimensional flow experiments were conducted with WFD ranging between 50 and 700 cm per day. A numerical model was developed to mimic the measurements, and also served for the evaluation of the analytical solution. For estimation WFD, and analytical model was developed to approximate heat transfer in this setting. The analytical solution was based on the work of Knight et al. (2012) and Knight et al. (2016), which suggests that the finite properties of the rods can be captured to a large extent by assuming them to be cylindrical perfect conductors. We found that: (1) the sensor is sensitive for measuring WFD in the investigated range, (2) the numerical model well-represents the sensor measurement, and (2) the analytical approximation could be improved by accounting for water and heat flow divergence by the large rods.
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