Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..150s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 150-154
Astronomy and Astrophysics
Astrophysics
Gravitational Collapse, Hydrogen Clouds, Kinematics, Star Formation, Three Dimensional Flow, Angular Momentum, Anisotropy, Computer Programs, Computerized Simulation, Density Distribution, Fourier Analysis, Gas Dynamics, Hydrogen Atoms, Molecules, Turbulence, Velocity Distribution
Scientific paper
The three-dimensional flow of a self-gravitating fluid is numerically simulated using a Fourier pseudospectral method with a logarithmic variable formulation. Two cases with zero total angular momentum are studied in detail, a 323 simulation (Run A) and a 643 simulation (Run B). Other than the grid size, the primary differences between the two cases are that Run A modeled atomic hydrogen and had considerably more compressible motion initially than Run B, which modeled molecular hydrogen. ('Compressible motion' is that part of the velocity which has zero curl, but non-zero divergence). The numerical results indicate that gravitational collapse can proceed in a variety of ways. In Run A, collapse led to an elongated tube-like structure, while in Run B, collapse led to a flatter, disk-like structure.
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