Results 31 to 40 of about 84,386 (305)
Perfect-fluid, generalized Robertson-Walker space-times, and Gray’s decomposition [PDF]
, 2019 We give new necessary and sufficient conditions on the Weyl tensor for generalized Robertson-Walker (GRW) space-times to be perfect-fluid space-times.
Sameh Shenawy +7 more
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Stationary Spherical Vortices in a Perfect Fluid [PDF]
Proceedings of the National Academy of Sciences, 1972 Necessary conditions are derived for a spherical vortex in a perfect fluid to be stationary in the case when the velocities depend on a single surface harmonic. The motion is indeterminate unless an additional condition is imposed. In the case when this condition is incompressibility, the equations are solved, yielding a class of stationary spherical ...
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On a perfect fluid Kahler spacetime
, 2016 The object of the present paper is to study a perfect fluid K¨ahlerspacetime. A perfect fluid K¨ahler spacetime satisfying the Einstein field equation with a cosmological term has been studied and the existence of killingand conformal killing vectors ...
PANDEY, P. N., SRIVASTAVA, VIBHA
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Similarity of Solutions of Non Conformally Perfect Fluid Models of Embedding Class One [PDF]
Engineering and Technology Journal, 2013 The Study of similarity Transformation Method has played a remarkable role of dealing with many immediate theoretical and practical applications in our life problems, such as physical and engineering problems [6].This method find the solution for the ...
Dhuha Majeed Salih
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Results in Physics, 2021 Static spaces (with perfect fluids) appeared in a natural way both in physics (cf. Hawking and Ellis, 1975) and mathematics (cf. A. Fischer and J. Marsden, Duke Math. J. 42 (3) (1975), 519–547).
Ibrahim Al-Dayel +2 more
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Quantum Cosmological Perfect Fluid Models [PDF]
General Relativity and Gravitation, 2002 Perfect fluid Friedmann-Robertson-Walker quantum cosmological models for an arbitrary barotropic equation of state $p = αρ$ are constructed using Schutz's variational formalism. In this approach the notion of time can be recovered. By superposition of stationary states, finite-norm wave-packet solutions to the Wheeler-DeWitt equation are found.
Alvarenga, F. G. +3 more
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Computational fluid dynamics framework for aerodynamic model assessment
, 2012 This paper reviews the work carried out at the University of Liverpool to assess the use of CFD methods for aircraft flight dynamics applications. Three test cases are discussed in the paper, namely, the Standard Dynamic Model, the Ranger 2000 jet ...
Perfect, P. +11 more
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Locomotion of Articulated Bodies in a Perfect Fluid [PDF]
Journal of Nonlinear Science, 2005 This paper is concerned with modeling the dynamics of N articulated solid bodies submerged in an ideal fluid. The model is used to analyze the locomotion of aquatic animals due to the coupling between their shape changes and the fluid dynamics in their environment. The equations of motion are obtained by making use of a two-stage reduction process
Eva Kanso +3 more
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Geometry of static perfect fluid space-time
, 2023 In this article, we investigate the geometry of static perfect fluid space-time on compact manifolds with boundary. We use the generalized Reilly's formula to establish a geometric inequality for a static perfect fluid space-time involving the area of ...
Costa, Johnatan +3 more
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Fluid dynamics in the warp drive spacetime geometry
European Physical Journal C: Particles and Fields, 2021 The Alcubierre warp drive metric is a spacetime geometry featuring a spacetime distortion, called a warp bubble, where a massive particle inside it acquires global superluminal velocities, or warp speeds.
Osvaldo L. Santos-Pereira +2 more
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