Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987zhetf..92..531m&link_type=abstract
Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki (ISSN 0044-4510), vol. 92, Feb. 1987, p. 531-538. In Russian.
Physics
11
Interstellar Space, Stellar Atmospheres, Thermal Instability, Condensation, Gas Dynamics, Gas Heating, Nonlinear Equations, Radiative Transfer
Scientific paper
One-dimensional gasdynamic equations are used to study the evolution of large-scale perturbations under conditions of thermal instability with gas heating and radiation taken into account. The characteristic thermal times in this case are significantly less than the gasdynamic time, and heat conductivity effects are insignificant. Explosive condensation and rarefaction of a gas turn out to be the two physically important classes of material motion in the present system. Analytical solutions describing these particular motion singularities are obtained, and the asymptotic behavior of solutions near the peculiarities is investigated. The realization of these solutions in the problem with 'natural' initial conditions is considered. The formation of intermediate 'pancake'-type structures is possible with the development of a thermal instability in the explosive condensation regime. The results are of interest in connection with processes in the interstellar medium and in stellar atmospheres.
Meerson B. I.
Sasorov Pavel V.
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