Abstract: A software package for researching of behavioral traits of the rotating gas in the external gravitational potential that based on the MUSCL-Hancock numerical method was developed. In the article we present descriptions of the mathematical model and the numerical method underlying the implementation. There are given descriptions of the software implementation and used technologies. There are performed the researches of the features of the shockwaves formations in conditions of the spiral gravitational potential, results of this researches are given.
Index terms: numerical method, MUSCL-Hancock, gasdynamic flows, gravitational potential.

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