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Journal of Applied Mechanics and Technical Physics

2021 year, number 3

Unsteady One-Dimensional Flows of a Vibrationally Excited Gas

Yu. N. Grigoryev1, S. V. Meleshko2, P. Siriwat3
1Institute of Computational Technologies, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
2School of Mathematics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
3School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand
Keywords: vibrationally excited gas, one-dimensional unsteady equations, admitted Lie algebra, self-similar solutions


Complete group analysis of the system of one-dimensional unsteady equations of the dynamics of a vibrationally excited gas is performed in the case of cylindrical and spherical symmetry. It is shown that the admitted Lie algebra does not contain the scaling generator of independent variables that defines the well-known self-similar solutions of strong shock wave problems for the similar system of the gas dynamics equations of an ideal gas. A modification of the characteristic relaxation time is proposed, which makes it possible to extend the admitted Lie algebra of the system by the generator of simultaneous scaling of independent variables and introduce a class of self-similar solutions. Using the problem of a strong linear explosion as an example, it is shown that the solution of the modified system of equations is physically consistent and fairly accurately describes the well-known effect of the divergence of static and vibrational temperatures behind the wave front.