Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........79h&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF COLORADO AT BOULDER, 1991.Source: Dissertation Abstracts International, Volume: 53-02, Section: B,
Other
Scientific paper
Two analyses pertaining to shock waves in a radiating gas are presented. The first study investigates the influence of an isothermal accretion shock on a spherical accretion flow. An "isothermal shock" is the combination of regular shock and a postshock radiative-cooling region, where the final temperature equals the preshock temperature. The accretion flow is assumed to be steady and polytropic, and the only external force is the gravitational attraction of a central object. The second study examines the fundamental nature of shocks in a radiating gas: their internal spatial structure and physical characteristics. A shock transition is treated as an isolated, independent system, within which the flow is steady and planar. A general analysis of the topology of spherical polytropic flows is presented as part of the accretion flow study. The influence of the postshock radiative-cooling region is illustrated by comparing the behavior of two systems: one with an isothermal shock, and one with a regular shock. For an isothermal shock, the density and pressure in the postshock flow are much higher, and their magnitudes decrease sharply with radius. The relationship between the shock location and the boundary conditions is also significantly different. An isothermal shock disrupts the quasi-steady evolution of the system toward its reversal into a wind. The latter portion of the evolution is very dynamic and requires time-dependent analysis. A more systematic approach to the analysis of radiating shock structure is presented. The symmetry and topology of the system are used to simplify the interpretation of its characteristics, most notably, the existence of viscous subshocks embedded in some structures. The analytical techniques provide a general method for studying the structure of steady shocks. They are applied to viscous shocks, thermally conducting shocks, and postshock radiative-cooling regions. The cooling region analysis confirms the validity of the isothermal assumption for the accretion shock, and it also determines the shock luminosity. Investigations of two complex radiating shock systems (with reference frame and magnetic field effects) are in progress. Both systems can be analyzed in a straightforward manner analogous to the simple radiating shock system.
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