Statistics – Computation
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..740v&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 740-750.
Statistics
Computation
72
Barred Galaxies, Galactic Structure, Gas Dynamics, Gas Flow, Interstellar Gas, Boundary Value Problems, Computational Fluid Dynamics, Flow Distribution, Galactic Nuclei, High Resolution, Mathematical Models, Shock Waves, Time Dependence, Two Dimensional Flow, Viscosity
Scientific paper
The considered investigation is concerned with conditions in that type of spiral galaxy which is known as a 'barred spiral'. The lack of star formation and the smoothness of the dark dust lanes may indicate that the bar region is pervaded by a more homogeneous interstellar medium with a lower viscosity than that characteristic of the outer regions. The effects of such a reduced viscosity are investigated on the basis of high-resolution time-dependent gasdynamical equations. Calculations modeling the gas flow in a given bar potential are presented. The calculations were performed on grids with various mesh sizes and consequently had different resolutions and numerical viscosities. A reduction in the numerical diffusion and viscosity was accompanied by changes in the flow pattern, including the appearance of a strong shock in the bar region and the occurrence of postshock outflow.
Roberts William W. Jr.
van Albada G. D.
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