Numerical simulations of thermal instabilities in stratified gases. II - Exploration of the parameter space

Details Numerical simulations of thermal instabilities in stratified gases. II - Exploration of the parameter space Numerical simulations of thermal instabilities in stratified gases. II - Exploration of the parameter space

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..379r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 379-390. Research supported by NA

Statistics

Computation

17

Stellar Atmospheres, Thermal Stability, Computational Astrophysics, Cooling Flows (Astrophysics), Digital Simulation, Plasma Layers

Scientific paper

The temporal evolution of density perturbations in an initially hydrostatic isothermal atmosphere consisting of an optically thin radiating compressible plasma is studied. Numerical techniques are used to describe the nonlinear evolution of the perturbations, and the relative equilibrium between dynamic and thermal instabilities as governed by three independent control parameters are examined, namely, the initial density contrast of the perturbation, the ratio of the local buoyancy oscillation period to the local radiative cooling time, and the ratio of the perturbation radius to the local scaleheight. Four orders of magnitude of initial density contrasts and ratios of buoyancy and cooling times, and one order of magnitude of the bubble dimensions are explored. Well-defined oscillations were found to occur in a limited parameter range, and thermal instability to occur even within secondary condensations deriving from the bubble fragmentation.

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