Инд. авторы:	Stoyanovskaya O.P., Glushko T.A., Snytnikov V.N., Snytnikov N.V.
Заглавие:	Two-fluid dusty gas in smoothed particle hydrodynamics: fast and implicit algorithm for stiff linear drag
Библ. ссылка:	Stoyanovskaya O.P., Glushko T.A., Snytnikov V.N., Snytnikov N.V. Two-fluid dusty gas in smoothed particle hydrodynamics: fast and implicit algorithm for stiff linear drag // Astronomy and Computing. - 2018. - Vol.25. - P.25-37. - ISSN 2213-1337.
Внешние системы:	DOI: 10.1016/j.ascom.2018.08.004; РИНЦ: 35726002; SCOPUS: 2-s2.0-85053066025; WoS: 000451390700003;
Реферат:	eng: Simulation of the dynamics of dust–gas circumstellar discs is crucial in understanding the mechanisms of planet formation. The dynamics of small grains in the disc is stiffly coupled to the gas, while the dynamics of grown solids is decoupled. Moreover, in some parts of the disc the concentration of the dust is low (dust to gas mass ratio is about 0.01), while in other parts it can be much higher. These factors place high requirements on the numerical methods for disc simulations. In particular, when gas and dust are simulated with two different fluids, explicit methods require very small timestep (must be less than dust stopping time tstop during which the velocity of a solid particle is equalized with respect to the gas velocity) to obtain solution, while some implicit methods require high temporal resolution to obtain acceptable accuracy. Moreover, recent studies underlined that for Smoothed particle hydrodynamics (SPH) when the gas and the dust are simulated with different sets of particles only high spatial resolution hststop guarantees suppression of numerical overdissipation due to gas and dust interaction. To address these problems, we developed a fast algorithm based on the ideas of (1) implicit integration of linear (Epstein) drag and (2) exact conservation of local linear momentum. We derived formulas for monodisperse dust–gas in two-fluid SPH and tested the new method on problems with known analytical solutions. We found that our method is a promising alternative for the previously developed two-fluid SPH scheme in case of stiff linear drag thanks to the fact that spatial resolution condition hststop is not required anymore for accurate results.
Ключевые слова:	Hydrodynamics; Smoothed particle hydrodynamics; Protoplanetary discs; Implicit integration; Implicit algorithm; High temporal resolution; High spatial resolution; Epstein drag simulation; Numerical methods; Image resolution; Gases; Dust; Drag; Protoplanetary discs; Hydrodynamics; Epstein drag simulation; Spatial resolution;
Издано:	2018
Физ. характеристика:	с.25-37
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