Search results for "Computational astrophysics"

showing 2 items of 2 documents

Three-dimensional simulation of polytropic accretion discs

1991

Three-dimensional simulations of the formation and evolution of accretion discs in close binary systems,realised with the Smoothed Particle Hydrodynamics method to solve the fluid dynamic equations, are presented. Although the runs presented here refer to an ideal gas with different polytropic indexes, and constitute the first stage of more physically complex forthcoming simulations, they nervertheless give some interesting results: the disc structure and dynamics are in agreement with standard models only for small γ-values; as a consequence of the z-resolution it is found that disc formation is inhibited for γ ≥ 1.2, which means that some 2 D simulations of polytropic discs are meaningles…

PhysicsAccretion (meteorology)Plane (geometry)Boundary (topology)Astronomy and AstrophysicsPolytropic processIdeal gasSmoothed-particle hydrodynamicsComputational astrophysicsClassical mechanicsSpace and Planetary ScienceBinary starAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsMonthly Notices of the Royal Astronomical Society
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The nonadiabatic general-relativistic stellar oscillations

1990

We have derived the equations which govern the linear nonadiabatic general-relativistic radial oscillations. The perturbation produces a heat flux that is coupled with the geometry, through the Einstein field equations of a stellar configuration. The classical limit is recovered. The stability conditions are examined by means of a simplified one-zone model.

PhysicsComputational astrophysicsClassical mechanicsHeat fluxSpace and Planetary ScienceGeneral relativityEinstein field equationsPerturbation (astronomy)Astronomy and AstrophysicsAstrophysics::Earth and Planetary AstrophysicsRelativistic quantum chemistryClassical limitStellar pulsationAstrophysics and Space Science
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