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Evolution to a steady state for a rarefied gas flowing from a tank into a vacuum through a plane channel

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Abstract

A kinetic equation (S-model) is used to solve the nonstationary problem of a monatomic rarefied gas flowing from a tank of infinite capacity into a vacuum through a long plane channel. Initially, the gas is at rest and is separated from the vacuum by a barrier. The temperature of the channel walls is kept constant. The flow is found to evolve to a steady state. The time required for reaching a steady state is examined depending on the channel length and the degree of gas rarefaction. The kinetic equation is solved numerically by applying a conservative explicit finite-difference scheme that is firstorder accurate in time and second-order accurate in space. An approximate law is proposed for the asymptotic behavior of the solution at long times when the evolution to a steady state becomes a diffusion process.

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Correspondence to N. A. Konopel’ko.

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Original Russian Text © N.A. Konopel’ko, E.M. Shakhov, 2017, published in Zhurnal Vychislitel’noi Matematiki i Matematicheskoi Fiziki, 2017, Vol. 57, No. 10, pp. 1722–1733.

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Konopel’ko, N.A., Shakhov, E.M. Evolution to a steady state for a rarefied gas flowing from a tank into a vacuum through a plane channel. Comput. Math. and Math. Phys. 57, 1695–1705 (2017). https://doi.org/10.1134/S0965542517100098

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  • DOI: https://doi.org/10.1134/S0965542517100098

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