Smooth particle hydrodynamics with locally readjustable resolution in the collapse of a gaseous protogalaxy

Details Smooth particle hydrodynamics with locally readjustable resolution in the collapse of a gaseous protogalaxy Smooth particle hydrodynamics with locally readjustable resolution in the collapse of a gaseous protogalaxy

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..333h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 333-340.

Statistics

Computation

12

Cosmic Gases, Galactic Evolution, Gas Dynamics, Hydrodynamic Equations, Adiabatic Conditions, Computational Astrophysics, Galaxies: Formation, Hydrodynamics, Numerical Methods

Scientific paper

A version of the smooth particle hydrodynamics (SPH) method with locally readjustable smoothing length h is presented here. An application of this method on the problem of the collapse of a gaseous protogalaxy is also given. The smoothing lengths are so arranged that any particle always interacts with a gaseous environment of constant number of particles (about 4% of the total number λ = 1072). These variations of Ii do not cause any violation in the conservation laws. In the final stage of an adiabatic evolution the protogalaxy (which rotates with a spin parameter = 0.046) is characterized by a high degree of organized motion in circular orbits. It is thermally supported and has a small eccentricity due to rotation. The profiles of density and thermal energy are in agreement with the results given by other authors in investigations of the adiabatic collapse of a gaseous sphere.

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